File indexing completed on 2024-05-12 08:54:45

 /*
     SPDX-FileCopyrightText: 2017 Nicolas Carion
     SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #include "trackmodel.hpp"
 #include "clipmodel.hpp"
 #include "compositionmodel.hpp"
 #include "core.h"
 #include "effects/effectstack/model/effectstackmodel.hpp"
 #include "kdenlivesettings.h"
 #include "transitions/transitionsrepository.hpp"
 #ifdef CRASH_AUTO_TEST
 #include "logger.hpp"
 #else
 #define TRACE_CONSTR(...)
 #endif
 #include "snapmodel.hpp"
 #include "timelinemodel.hpp"
 #include <QDebug>
 #include <QModelIndex>
 #include <memory>
 #include <mlt++/MltTransition.h>
 
 TrackModel::TrackModel(const std::weak_ptr<TimelineModel> &parent, int id, const QString &trackName, bool audioTrack)
     : m_parent(parent)
     , m_id(id == -1 ? TimelineModel::getNextId() : id)
     , m_lock(QReadWriteLock::Recursive)
     , m_softDelete(false)
 {
     if (auto ptr = parent.lock()) {
         m_track = std::make_shared<Mlt::Tractor>(pCore->getProjectProfile());
         m_playlists[0].set_profile(pCore->getProjectProfile().get_profile());
         m_playlists[1].set_profile(pCore->getProjectProfile().get_profile());
         m_track->insert_track(m_playlists[0], 0);
         m_track->insert_track(m_playlists[1], 1);
         if (!trackName.isEmpty()) {
             m_track->set("kdenlive:track_name", trackName.toUtf8().constData());
         }
         if (audioTrack) {
             m_track->set("kdenlive:audio_track", 1);
             for (auto &m_playlist : m_playlists) {
                 m_playlist.set("hide", 1);
             }
         } else {
             // Video track
             for (auto &m_playlist : m_playlists) {
                 m_playlist.set("hide", 2);
             }
         }
         // For now we never use the second playlist, only planned for same track transitions
         m_track->set("kdenlive:trackheight", KdenliveSettings::trackheight());
         m_track->set("kdenlive:timeline_active", 1);
         m_effectStack = EffectStackModel::construct(m_track, ObjectId(KdenliveObjectType::TimelineTrack, m_id, ptr->uuid()), ptr->m_undoStack);
         // TODO
         // When we use the second playlist, register it's stask as child of main playlist effectstack
         // m_subPlaylist = std::make_shared<Mlt::Producer>(&m_playlists[1]);
         // m_effectStack->addService(m_subPlaylist);
         QObject::connect(m_effectStack.get(), &EffectStackModel::dataChanged, [&](const QModelIndex &, const QModelIndex &, const QVector<int> &roles) {
             if (auto ptr2 = m_parent.lock()) {
                 QModelIndex ix = ptr2->makeTrackIndexFromID(m_id);
                 qDebug() << "==== TRACK ZONES CHANGED";
                 Q_EMIT ptr2->dataChanged(ix, ix, roles);
             }
         });
     } else {
         qDebug() << "Error : construction of track failed because parent timeline is not available anymore";
         Q_ASSERT(false);
     }
 }
 
 TrackModel::TrackModel(const std::weak_ptr<TimelineModel> &parent, Mlt::Tractor mltTrack, int id)
     : m_parent(parent)
     , m_id(id == -1 ? TimelineModel::getNextId() : id)
     , m_softDelete(false)
 {
     if (auto ptr = parent.lock()) {
         m_track = std::make_shared<Mlt::Tractor>(mltTrack);
         m_playlists[0] = *m_track->track(0);
         m_playlists[1] = *m_track->track(1);
         m_effectStack = EffectStackModel::construct(m_track, ObjectId(KdenliveObjectType::TimelineTrack, m_id, ptr->uuid()), ptr->m_undoStack);
     } else {
         qDebug() << "Error : construction of track failed because parent timeline is not available anymore";
         Q_ASSERT(false);
     }
 }
 
 TrackModel::~TrackModel()
 {
     if (!m_softDelete) {
         QScopedPointer<Mlt::Service> service(m_track->field());
         QScopedPointer<Mlt::Field> field(m_track->field());
         field->lock();
         while (service != nullptr && service->is_valid()) {
             if (service->type() == mlt_service_transition_type) {
                 Mlt::Transition t(mlt_transition(service->get_service()));
                 service.reset(service->producer());
                 // remove all compositing
                 field->disconnect_service(t);
                 t.disconnect_all_producers();
             } else {
                 service.reset(service->producer());
             }
         }
         field->unlock();
         m_sameCompositions.clear();
         m_allClips.clear();
         m_allCompositions.clear();
         m_track->remove_track(1);
         m_track->remove_track(0);
     }
 }
 
 int TrackModel::construct(const std::weak_ptr<TimelineModel> &parent, int id, int pos, const QString &trackName, bool audioTrack, bool singleOperation)
 {
     std::shared_ptr<TrackModel> track(new TrackModel(parent, id, trackName, audioTrack));
     TRACE_CONSTR(track.get(), parent, id, pos, trackName, audioTrack);
     id = track->m_id;
     if (auto ptr = parent.lock()) {
         ptr->registerTrack(std::move(track), pos, true, singleOperation);
     } else {
         qDebug() << "Error : construction of track failed because parent timeline is not available anymore";
         Q_ASSERT(false);
     }
     return id;
 }
 
 int TrackModel::getClipsCount()
 {
     READ_LOCK();
 #ifdef QT_DEBUG
     int count = 0;
     for (auto &m_playlist : m_playlists) {
         for (int i = 0; i < m_playlist.count(); i++) {
             if (!m_playlist.is_blank(i)) {
                 count++;
             }
         }
     }
     Q_ASSERT(count == static_cast<int>(m_allClips.size()));
 #else
     int count = int(m_allClips.size());
 #endif
     return count;
 }
 
 bool TrackModel::switchPlaylist(int clipId, int position, int sourcePlaylist, int destPlaylist)
 {
     QWriteLocker locker(&m_lock);
     if (sourcePlaylist == destPlaylist) {
         return true;
     }
     Q_ASSERT(!m_playlists[sourcePlaylist].is_blank_at(position) && m_playlists[destPlaylist].is_blank_at(position));
     int target_clip = m_playlists[sourcePlaylist].get_clip_index_at(position);
     std::unique_ptr<Mlt::Producer> prod(m_playlists[sourcePlaylist].replace_with_blank(target_clip));
     m_playlists[sourcePlaylist].consolidate_blanks();
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
         clip->setSubPlaylistIndex(destPlaylist, m_id);
         int index = m_playlists[destPlaylist].insert_at(position, *clip, 1);
         m_playlists[destPlaylist].consolidate_blanks();
         return index != -1;
     }
     return false;
 }
 
 Fun TrackModel::requestClipInsertion_lambda(int clipId, int position, bool updateView, bool finalMove, bool groupMove, const QList<int> &allowedClipMixes)
 {
     QWriteLocker locker(&m_lock);
     // By default, insertion occurs in topmost track
     int target_playlist = 0;
     int length = -1;
     if (auto ptr = m_parent.lock()) {
         Q_ASSERT(ptr->getClipPtr(clipId)->getCurrentTrackId() == -1);
         target_playlist = ptr->getClipPtr(clipId)->getSubPlaylistIndex();
         length = ptr->getClipPtr(clipId)->getPlaytime() - 1;
         /*if (target_playlist == 1 && ptr->getClipPtr(clipId)->getMixDuration() == 0) {
             target_playlist = 0;
         }*/
         // qDebug()<<"==== GOT TRARGET PLAYLIST: "<<target_playlist;
     } else {
         qDebug() << "impossible to get parent timeline";
         Q_ASSERT(false);
     }
     // Find out the clip id at position
     int target_clip = m_playlists[target_playlist].get_clip_index_at(position);
     int count = m_playlists[target_playlist].count();
 
     // we create the function that has to be executed after the melt order. This is essentially book-keeping
     auto end_function = [clipId, this, position, updateView, finalMove](int subPlaylist) {
         if (auto ptr = m_parent.lock()) {
             std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
             m_allClips[clip->getId()] = clip; // store clip
             // update clip position and track
             clip->setPosition(position);
             if (finalMove) {
                 clip->setSubPlaylistIndex(subPlaylist, m_id);
             }
             int new_in = clip->getPosition();
             int new_out = new_in + clip->getPlaytime();
             ptr->m_snaps->addPoint(new_in);
             ptr->m_snaps->addPoint(new_out);
             if (updateView) {
                 int clip_index = getRowfromClip(clipId);
                 ptr->_beginInsertRows(ptr->makeTrackIndexFromID(m_id), clip_index, clip_index);
                 ptr->_endInsertRows();
                 bool audioOnly = clip->isAudioOnly();
                 if (!audioOnly && !isHidden() && !isAudioTrack()) {
                     // only refresh monitor if not an audio track and not hidden
                     ptr->checkRefresh(new_in, new_out);
                 }
                 if (!audioOnly && finalMove && !isAudioTrack()) {
                     Q_EMIT ptr->invalidateZone(new_in, new_out);
                 }
             }
             return true;
         }
         qDebug() << "Error : Clip Insertion failed because timeline is not available anymore";
         return false;
     };
     if (!finalMove && !hasMix(clipId)) {
         if (allowedClipMixes.isEmpty()) {
             if (!m_playlists[0].is_blank_at(position) || !m_playlists[1].is_blank_at(position)) {
                 // Track is not empty
                 qWarning() << "clip insert failed - non blank 1";
                 return []() { return false; };
             }
         } else {
             // This is a group move with a mix, some clips are allowed
             if (!m_playlists[target_playlist].is_blank_at(position)) {
                 // Track is not empty
                 qWarning() << "clip insert failed - non blank 2";
                 return []() { return false; };
             }
             // Check if there are clips on the other playlist, and if they are in the allowed list
             std::unordered_set<int> collisions = getClipsInRange(position, position + length);
             qDebug() << "==== DETECTING COLLISIONS AT: " << position << " to " << (position + length) << " COUNT: " << collisions.size();
             for (int c : collisions) {
                 if (!allowedClipMixes.contains(c)) {
                     // Track is not empty
                     qWarning() << "clip insert failed - non blank 3";
                     return []() { return false; };
                 }
             }
         }
     }
     if (target_clip >= count && m_playlists[target_playlist].is_blank_at(position)) {
         // In that case, we append after, in the first playlist
         return [this, position, clipId, end_function, finalMove, groupMove, target_playlist]() {
             if (isLocked()) {
                 qWarning() << "clip insert failed - locked track";
                 return false;
             }
             if (auto ptr = m_parent.lock()) {
                 // Lock MLT playlist so that we don't end up with an invalid frame being displayed
                 std::unique_ptr<Mlt::Field> field(m_track->field());
                 field->block();
                 m_playlists[target_playlist].lock();
                 std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
                 clip->setCurrentTrackId(m_id, finalMove);
                 int index = m_playlists[target_playlist].insert_at(position, *clip, 1);
                 m_playlists[target_playlist].consolidate_blanks();
                 m_playlists[target_playlist].unlock();
                 field->unblock();
                 if (finalMove && !groupMove) {
                     ptr->updateDuration();
                 }
                 return index != -1 && end_function(target_playlist);
             }
             qDebug() << "Error : Clip Insertion failed because timeline is not available anymore";
             return false;
         };
     }
     if (m_playlists[target_playlist].is_blank_at(position)) {
         int blank_end = getBlankEnd(position, target_playlist);
         if (blank_end >= position + length) {
             return [this, position, clipId, end_function, target_playlist]() {
                 if (isLocked()) return false;
                 if (auto ptr = m_parent.lock()) {
                     // Lock MLT playlist so that we don't end up with an invalid frame being displayed
                     std::unique_ptr<Mlt::Field> field(m_track->field());
                     field->block();
                     m_playlists[target_playlist].lock();
                     std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
                     clip->setCurrentTrackId(m_id);
                     int index = m_playlists[target_playlist].insert_at(position, *clip, 1);
                     m_playlists[target_playlist].consolidate_blanks();
                     m_playlists[target_playlist].unlock();
                     field->unblock();
                     return index != -1 && end_function(target_playlist);
                 }
                 qDebug() << "Error : Clip Insertion failed because timeline is not available anymore";
                 return false;
             };
         }
     }
     return []() { return false; };
 }
 
 bool TrackModel::requestClipInsertion(int clipId, int position, bool updateView, bool finalMove, Fun &undo, Fun &redo, bool groupMove, bool newInsertion,
                                       const QList<int> &allowedClipMixes)
 {
     QWriteLocker locker(&m_lock);
     if (isLocked()) {
         qDebug() << "==== ERROR INSERT OK LOCKED TK";
         return false;
     }
     if (position < 0) {
         qDebug() << "==== ERROR INSERT ON NEGATIVE POS: " << position;
         return false;
     }
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
         if (isAudioTrack() && !clip->canBeAudio()) {
             qDebug() << "// ATTEMPTING TO INSERT NON AUDIO CLIP ON AUDIO TRACK";
             return false;
         }
         if (!isAudioTrack() && !clip->canBeVideo()) {
             qDebug() << "// ATTEMPTING TO INSERT NON VIDEO CLIP ON VIDEO TRACK";
             return false;
         }
         Fun local_undo = []() { return true; };
         Fun local_redo = []() { return true; };
         bool res = true;
         if (clip->clipState() != PlaylistState::Disabled) {
             res = clip->setClipState(isAudioTrack() ? PlaylistState::AudioOnly : PlaylistState::VideoOnly, local_undo, local_redo);
         }
         int duration = trackDuration();
         auto operation = requestClipInsertion_lambda(clipId, position, updateView, finalMove, groupMove, allowedClipMixes);
         res = res && operation();
         if (res) {
             if (finalMove && duration != trackDuration()) {
                 // A clip move changed the track duration, update track effects
                 m_effectStack->adjustStackLength(true, 0, duration, 0, trackDuration(), 0, undo, redo, true);
             }
             auto reverse = requestClipDeletion_lambda(clipId, updateView, finalMove, groupMove, newInsertion && finalMove);
             UPDATE_UNDO_REDO(operation, reverse, local_undo, local_redo);
             UPDATE_UNDO_REDO(local_redo, local_undo, undo, redo);
             return true;
         }
         bool undone = local_undo();
         Q_ASSERT(undone);
         return false;
     }
     return false;
 }
 
 void TrackModel::adjustStackLength(int duration, int newDuration, Fun &undo, Fun &redo)
 {
     m_effectStack->adjustStackLength(true, 0, duration, 0, newDuration, 0, undo, redo, true);
 }
 
 void TrackModel::temporaryUnplugClip(int clipId)
 {
     QWriteLocker locker(&m_lock);
     int clip_position = m_allClips[clipId]->getPosition();
     int target_track = m_allClips[clipId]->getSubPlaylistIndex();
     auto clip_loc = getClipIndexAt(clip_position, target_track);
     int target_clip = clip_loc.second;
     // lock MLT playlist so that we don't end up with invalid frames in monitor
     m_playlists[target_track].lock();
     Q_ASSERT(target_clip < m_playlists[target_track].count());
     Q_ASSERT(!m_playlists[target_track].is_blank(target_clip));
     std::unique_ptr<Mlt::Producer> prod(m_playlists[target_track].replace_with_blank(target_clip));
     m_playlists[target_track].unlock();
 }
 
 void TrackModel::temporaryReplugClip(int cid)
 {
     QWriteLocker locker(&m_lock);
     int clip_position = m_allClips[cid]->getPosition();
     int target_track = m_allClips[cid]->getSubPlaylistIndex();
     m_playlists[target_track].lock();
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(cid);
         m_playlists[target_track].insert_at(clip_position, *clip, 1);
     }
     m_playlists[target_track].unlock();
 }
 
 void TrackModel::replugClip(int clipId)
 {
     QWriteLocker locker(&m_lock);
     int clip_position = m_allClips[clipId]->getPosition();
     auto clip_loc = getClipIndexAt(clip_position, m_allClips[clipId]->getSubPlaylistIndex());
     int target_track = clip_loc.first;
     int target_clip = clip_loc.second;
     // lock MLT playlist so that we don't end up with invalid frames in monitor
     m_playlists[target_track].lock();
     Q_ASSERT(target_clip < m_playlists[target_track].count());
     Q_ASSERT(!m_playlists[target_track].is_blank(target_clip));
     std::unique_ptr<Mlt::Producer> prod(m_playlists[target_track].replace_with_blank(target_clip));
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(clipId);
         m_playlists[target_track].insert_at(clip_position, *clip, 1);
         if (!clip->isAudioOnly() && !isAudioTrack()) {
             Q_EMIT ptr->invalidateZone(clip->getIn(), clip->getOut());
         }
         if (!clip->isAudioOnly() && !isHidden() && !isAudioTrack()) {
             // only refresh monitor if not an audio track and not hidden
             ptr->checkRefresh(clip->getIn(), clip->getOut());
         }
     }
     m_playlists[target_track].consolidate_blanks();
     m_playlists[target_track].unlock();
 }
 
 Fun TrackModel::requestClipDeletion_lambda(int clipId, bool updateView, bool finalMove, bool groupMove, bool finalDeletion)
 {
     QWriteLocker locker(&m_lock);
     // Find index of clip
     int clip_position = m_allClips[clipId]->getPosition();
     bool audioOnly = m_allClips[clipId]->isAudioOnly();
     int old_in = clip_position;
     int old_out = old_in + m_allClips[clipId]->getPlaytime();
     return [clip_position, clipId, old_in, old_out, updateView, audioOnly, finalMove, groupMove, finalDeletion, this]() {
         if (isLocked()) return false;
         if (finalDeletion && m_allClips[clipId]->selected) {
             m_allClips[clipId]->selected = false;
             if (auto ptr = m_parent.lock()) {
                 // item was selected, unselect
                 ptr->requestClearSelection(true);
             }
         }
         int target_track = m_allClips[clipId]->getSubPlaylistIndex();
         auto clip_loc = getClipIndexAt(clip_position, target_track);
         if (updateView) {
             int old_clip_index = getRowfromClip(clipId);
             auto ptr = m_parent.lock();
             ptr->_beginRemoveRows(ptr->makeTrackIndexFromID(getId()), old_clip_index, old_clip_index);
             ptr->_endRemoveRows();
         }
         int target_clip = clip_loc.second;
         // lock MLT playlist so that we don't end up with invalid frames in monitor
         m_playlists[target_track].lock();
         std::unique_ptr<Mlt::Field> field(m_track->field());
         field->block();
         Q_ASSERT(target_clip < m_playlists[target_track].count());
         Q_ASSERT(!m_playlists[target_track].is_blank(target_clip));
         auto prod = m_playlists[target_track].replace_with_blank(target_clip);
         if (prod != nullptr) {
             m_playlists[target_track].consolidate_blanks();
             m_allClips[clipId]->setCurrentTrackId(-1);
             // m_allClips[clipId]->setSubPlaylistIndex(-1);
             m_allClips.erase(clipId);
             delete prod;
             field->unblock();
             m_playlists[target_track].unlock();
             if (auto ptr = m_parent.lock()) {
                 ptr->m_snaps->removePoint(old_in);
                 ptr->m_snaps->removePoint(old_out);
                 if (finalMove && !ptr->m_closing) {
                     if (!audioOnly && !isAudioTrack()) {
                         Q_EMIT ptr->invalidateZone(old_in, old_out);
                     }
                     if (!groupMove && target_clip >= m_playlists[target_track].count()) {
                         // deleted last clip in playlist
                         ptr->updateDuration();
                     }
                 }
                 if (!audioOnly && !isHidden() && !isAudioTrack()) {
                     // only refresh monitor if not an audio track and not hidden
                     ptr->checkRefresh(old_in, old_out);
                 }
             }
             return true;
         }
         field->unblock();
         m_playlists[target_track].unlock();
         return false;
     };
 }
 
 bool TrackModel::requestClipDeletion(int clipId, bool updateView, bool finalMove, Fun &undo, Fun &redo, bool groupMove, bool finalDeletion,
                                      const QList<int> &allowedClipMixes)
 {
     QWriteLocker locker(&m_lock);
     Q_ASSERT(m_allClips.count(clipId) > 0);
     if (isLocked()) {
         return false;
     }
     auto old_clip = m_allClips[clipId];
     bool closing = false;
     QUuid timelineUuid;
     if (auto ptr = m_parent.lock()) {
         closing = ptr->m_closing;
         timelineUuid = ptr->uuid();
     }
     int old_position = old_clip->getPosition();
     // qDebug() << "/// REQUESTOING CLIP DELETION_: " << updateView;
     int duration = trackDuration();
     if (finalDeletion) {
         pCore->taskManager.discardJobs(ObjectId(KdenliveObjectType::TimelineClip, clipId, timelineUuid));
     }
     auto operation = requestClipDeletion_lambda(clipId, updateView, finalMove, groupMove, finalDeletion);
     if (operation()) {
         if (!closing && finalMove && duration != trackDuration()) {
             // A clip move changed the track duration, update track effects
             m_effectStack->adjustStackLength(true, 0, duration, 0, trackDuration(), 0, undo, redo, true);
         }
         auto reverse = requestClipInsertion_lambda(clipId, old_position, updateView, finalMove, groupMove, allowedClipMixes);
         UPDATE_UNDO_REDO(operation, reverse, undo, redo);
         return true;
     }
     return false;
 }
 
 int TrackModel::getBlankSizeAtPos(int frame)
 {
     READ_LOCK();
     int min_length = 0;
     int blank_length = 0;
     for (auto &m_playlist : m_playlists) {
         int playlistLength = m_playlist.get_length();
         if (frame >= playlistLength) {
             blank_length = frame - playlistLength + 1;
         } else {
             int ix = m_playlist.get_clip_index_at(frame);
             if (m_playlist.is_blank(ix)) {
                 blank_length = m_playlist.clip_length(ix);
             } else {
                 // There is a clip at that position, abort
                 return 0;
             }
         }
         if (min_length == 0 || blank_length < min_length) {
             min_length = blank_length;
         }
     }
     if (blank_length == 0) {
         // playlists are shorter than frame
         return -1;
     }
     return min_length;
 }
 
 int TrackModel::suggestCompositionLength(int position)
 {
     READ_LOCK();
     if (m_playlists[0].is_blank_at(position) && m_playlists[1].is_blank_at(position)) {
         return -1;
     }
     auto clip_loc = getClipIndexAt(position);
     int track = clip_loc.first;
     int index = clip_loc.second;
     int other_index; // index in the other track
     int other_track = 1 - track;
     int end_pos = m_playlists[track].clip_start(index) + m_playlists[track].clip_length(index);
     other_index = m_playlists[other_track].get_clip_index_at(end_pos);
     if (other_index < m_playlists[other_track].count()) {
         end_pos = std::min(end_pos, m_playlists[other_track].clip_start(other_index) + m_playlists[other_track].clip_length(other_index));
     }
     return end_pos - position;
 }
 
 QPair<int, int> TrackModel::validateCompositionLength(int pos, int offset, int duration, int endPos)
 {
     int startPos = pos;
     bool startingFromOffset = false;
     if (duration < offset) {
         startPos += offset;
         startingFromOffset = true;
         if (startPos + duration > endPos) {
             startPos = endPos - duration;
         }
     }
 
     int compsitionEnd = startPos + duration;
     std::unordered_set<int> existing;
     if (startingFromOffset) {
         existing = getCompositionsInRange(startPos, compsitionEnd);
         for (int id : existing) {
             if (m_allCompositions[id]->getPosition() < startPos) {
                 int end = m_allCompositions[id]->getPosition() + m_allCompositions[id]->getPlaytime();
                 startPos = qMax(startPos, end);
             }
         }
     } else if (offset > 0) {
         existing = getCompositionsInRange(startPos, startPos + offset);
         for (int id : existing) {
             int end = m_allCompositions[id]->getPosition() + m_allCompositions[id]->getPlaytime();
             startPos = qMax(startPos, end);
         }
     }
     existing = getCompositionsInRange(startPos, compsitionEnd);
     for (int id : existing) {
         int start = m_allCompositions[id]->getPosition();
         compsitionEnd = qMin(compsitionEnd, start);
     }
     return {startPos, compsitionEnd - startPos};
 }
 
 int TrackModel::getBlankSizeNearClip(int clipId, bool after)
 {
     READ_LOCK();
     Q_ASSERT(m_allClips.count(clipId) > 0);
     int clip_position = m_allClips[clipId]->getPosition();
     auto clip_loc = getClipIndexAt(clip_position);
     int track = clip_loc.first;
     int index = clip_loc.second;
     int other_index; // index in the other track
     int other_track = 1 - track;
     if (after) {
         int first_pos = m_playlists[track].clip_start(index) + m_playlists[track].clip_length(index);
         other_index = m_playlists[other_track].get_clip_index_at(first_pos);
         index++;
     } else {
         int last_pos = m_playlists[track].clip_start(index) - 1;
         other_index = m_playlists[other_track].get_clip_index_at(last_pos);
         index--;
     }
     if (index < 0) return 0;
     int length = INT_MAX;
     if (index < m_playlists[track].count()) {
         if (!m_playlists[track].is_blank(index)) {
             return 0;
         }
         length = std::min(length, m_playlists[track].clip_length(index));
     } else if (!after) {
         length = std::min(length, m_playlists[track].clip_start(clip_loc.second) - m_playlists[track].get_length());
     }
     if (other_index < m_playlists[other_track].count()) {
         if (!m_playlists[other_track].is_blank(other_index)) {
             return 0;
         }
         length = std::min(length, m_playlists[other_track].clip_length(other_index));
     } else if (!after) {
         length = std::min(length, m_playlists[track].clip_start(clip_loc.second) - m_playlists[other_track].get_length());
     }
     return length;
 }
 
 int TrackModel::getBlankSizeNearComposition(int compoId, bool after)
 {
     READ_LOCK();
     Q_ASSERT(m_allCompositions.count(compoId) > 0);
     int clip_position = m_allCompositions[compoId]->getPosition();
     Q_ASSERT(m_compoPos.count(clip_position) > 0);
     Q_ASSERT(m_compoPos[clip_position] == compoId);
     auto it = m_compoPos.find(clip_position);
     int clip_length = m_allCompositions[compoId]->getPlaytime();
     int length = INT_MAX;
     if (after) {
         ++it;
         if (it != m_compoPos.end()) {
             return it->first - clip_position - clip_length;
         }
     } else {
         if (it != m_compoPos.begin()) {
             --it;
             return clip_position - it->first - m_allCompositions[it->second]->getPlaytime();
         }
         return clip_position;
     }
     return length;
 }
 
 Fun TrackModel::requestClipResize_lambda(int clipId, int in, int out, bool right, bool hasMix, bool finalMove)
 {
     QWriteLocker locker(&m_lock);
     int clip_position = m_allClips[clipId]->getPosition();
     int old_in = clip_position;
     int old_out = old_in + m_allClips[clipId]->getPlaytime();
     auto clip_loc = getClipIndexAt(clip_position, m_allClips[clipId]->getSubPlaylistIndex());
     int target_track = clip_loc.first;
     int target_clip = clip_loc.second;
     Q_ASSERT(target_clip < m_playlists[target_track].count());
     int size = out - in + 1;
     bool checkRefresh = false;
     if (!isHidden() && !isAudioTrack()) {
         checkRefresh = true;
     }
     auto update_snaps = [old_in, old_out, checkRefresh, right, this](int new_in, int new_out) {
         if (auto ptr = m_parent.lock()) {
             if (right) {
                 ptr->m_snaps->removePoint(old_out);
                 ptr->m_snaps->addPoint(new_out);
             } else {
                 ptr->m_snaps->removePoint(old_in);
                 ptr->m_snaps->addPoint(new_in);
             }
             if (checkRefresh) {
                 if (right) {
                     if (old_out < new_out) {
                         ptr->checkRefresh(old_out, new_out);
                     } else {
                         ptr->checkRefresh(new_out, old_out);
                     }
                 } else if (old_in < new_in) {
                     ptr->checkRefresh(old_in, new_in);
                 } else {
                     ptr->checkRefresh(new_in, old_in);
                 }
             }
         } else {
             qDebug() << "Error : clip resize failed because parent timeline is not available anymore";
             Q_ASSERT(false);
         }
     };
 
     int delta = m_allClips[clipId]->getPlaytime() - size;
     if (delta == 0) {
         return []() { return true; };
     }
     if (delta > 0) { // we shrink clip
         return [right, target_clip, target_track, clip_position, delta, in, out, clipId, update_snaps, finalMove, this]() {
             if (isLocked()) return false;
             int target_clip_mutable = target_clip;
             int blank_index = right ? (target_clip_mutable + 1) : target_clip_mutable;
             // insert blank to space that is going to be empty
             m_playlists[target_track].lock();
             // The second is parameter is delta - 1 because this function expects an out time, which is basically size - 1
             m_playlists[target_track].insert_blank(blank_index, delta - 1);
             if (!right) {
                 m_allClips[clipId]->setPosition(clip_position + delta);
                 // Because we inserted blank before, the index of our clip has increased
                 target_clip_mutable++;
             }
             int err = m_playlists[target_track].resize_clip(target_clip_mutable, in, out);
             // make sure to do this after, to avoid messing the indexes
             m_playlists[target_track].consolidate_blanks();
             m_playlists[target_track].unlock();
             if (err == 0) {
                 update_snaps(m_allClips[clipId]->getPosition(), m_allClips[clipId]->getPosition() + out - in + 1);
                 if (right && finalMove && m_playlists[target_track].count() - 1 == target_clip_mutable) {
                     // deleted last clip in playlist
                     if (auto ptr = m_parent.lock()) {
                         ptr->updateDuration();
                     }
                 }
             }
             return err == 0;
         };
     }
     int blank = -1;
     int startPos = clip_position;
     if (hasMix) {
         startPos += m_allClips[clipId]->getMixDuration();
     }
     int endPos = m_allClips[clipId]->getPosition() + (out - in);
     int other_blank_end = getBlankEnd(startPos, 1 - target_track);
     if (right) {
         if (target_clip == m_playlists[target_track].count() - 1 && (hasMix || other_blank_end >= endPos)) {
             // clip is last, it can always be extended
             if (hasMix && other_blank_end < endPos && !hasEndMix(clipId)) {
                 // If clip has a start mix only, limit to next clip on other track
                 return []() { return false; };
             }
             return [this, target_clip, target_track, in, out, update_snaps, clipId, finalMove]() {
                 if (isLocked()) return false;
                 // color, image and title clips can have unlimited resize
                 QScopedPointer<Mlt::Producer> clip(m_playlists[target_track].get_clip(target_clip));
                 if (out >= clip->get_length()) {
                     clip->parent().set("length", out + 1);
                     clip->parent().set("out", out);
                     clip->set("length", out + 1);
                 }
                 int err = m_playlists[target_track].resize_clip(target_clip, in, out);
                 if (err == 0) {
                     update_snaps(m_allClips[clipId]->getPosition(), m_allClips[clipId]->getPosition() + out - in + 1);
                 }
                 m_playlists[target_track].consolidate_blanks();
                 if (finalMove && m_playlists[target_track].count() - 1 == target_clip) {
                     // Resized last clip in playlist
                     if (auto ptr = m_parent.lock()) {
                         ptr->updateDuration();
                     }
                 }
                 return err == 0;
             };
         } else {
         }
         blank = target_clip + 1;
     } else {
         if (target_clip == 0) {
             // clip is first, it can never be extended on the left
             return []() { return false; };
         }
         blank = target_clip - 1;
     }
     if (m_playlists[target_track].is_blank(blank)) {
         int blank_length = m_playlists[target_track].clip_length(blank);
         if (blank_length + delta >= 0 && (hasMix || other_blank_end >= out - in)) {
             return [blank_length, blank, right, clipId, delta, update_snaps, this, in, out, target_clip, target_track]() {
                 if (isLocked()) return false;
                 int target_clip_mutable = target_clip;
                 int err = 0;
                 m_playlists[target_track].lock();
                 if (blank_length + delta == 0) {
                     err = m_playlists[target_track].remove(blank);
                     if (!right) {
                         target_clip_mutable--;
                     }
                 } else {
                     err = m_playlists[target_track].resize_clip(blank, 0, blank_length + delta - 1);
                 }
                 if (err == 0) {
                     // m_track->block();
                     QScopedPointer<Mlt::Producer> clip(m_playlists[target_track].get_clip(target_clip_mutable));
                     if (out >= clip->get_length()) {
                         clip->parent().set("length", out + 1);
                         clip->parent().set("out", out);
                         clip->set("length", out + 1);
                         clip->set("out", out);
                     }
                     err = m_playlists[target_track].resize_clip(target_clip_mutable, in, out);
                     // m_track->unblock();
                 }
                 if (!right && err == 0) {
                     m_allClips[clipId]->setPosition(m_playlists[target_track].clip_start(target_clip_mutable));
                 }
                 if (err == 0) {
                     update_snaps(m_allClips[clipId]->getPosition(), m_allClips[clipId]->getPosition() + out - in + 1);
                 }
                 m_playlists[target_track].consolidate_blanks();
                 m_playlists[target_track].unlock();
                 return err == 0;
             };
         } else {
         }
     }
     return []() {
         qDebug() << "=====FULL FAILURE ";
         return false;
     };
 }
 
 int TrackModel::getId() const
 {
     return m_id;
 }
 
 int TrackModel::getClipByStartPosition(int position) const
 {
     READ_LOCK();
     for (auto &clip : m_allClips) {
         if (clip.second->getPosition() == position) {
             return clip.second->getId();
         }
     }
     return -1;
 }
 
 int TrackModel::getClipByPosition(int position, int playlist)
 {
     READ_LOCK();
     QSharedPointer<Mlt::Producer> prod(nullptr);
     if ((playlist == 0 || playlist == -1) && m_playlists[0].count() > 0) {
         prod = QSharedPointer<Mlt::Producer>(m_playlists[0].get_clip_at(position));
     }
     if (playlist != 0 && (!prod || prod->is_blank()) && m_playlists[1].count() > 0) {
         prod = QSharedPointer<Mlt::Producer>(m_playlists[1].get_clip_at(position));
     }
     if (!prod || prod->is_blank()) {
         return -1;
     }
     int cid = prod->get_int("_kdenlive_cid");
     if (playlist == -1) {
         if (hasStartMix(cid)) {
             if (position < m_allClips[cid]->getPosition() + m_allClips[cid]->getMixCutPosition()) {
                 return m_mixList.key(cid, -1);
             }
         }
         if (m_mixList.contains(cid)) {
             // Clip has end mix
             int otherId = m_mixList.value(cid);
             if (position >= m_allClips[cid]->getPosition() + m_allClips[cid]->getPlaytime() - m_allClips[otherId]->getMixCutPosition()) {
                 return otherId;
             }
         }
     }
     return cid;
 }
 
 QSharedPointer<Mlt::Producer> TrackModel::getClipProducer(int clipId)
 {
     READ_LOCK();
     QSharedPointer<Mlt::Producer> prod(nullptr);
     if (m_playlists[0].count() > 0) {
         prod = QSharedPointer<Mlt::Producer>(m_playlists[0].get_clip(clipId));
     }
     if ((!prod || prod->is_blank()) && m_playlists[1].count() > 0) {
         prod = QSharedPointer<Mlt::Producer>(m_playlists[1].get_clip(clipId));
     }
     return prod;
 }
 
 int TrackModel::getCompositionByPosition(int position)
 {
     READ_LOCK();
     for (const auto &comp : m_compoPos) {
         if (comp.first == position) {
             return comp.second;
         } else if (comp.first < position) {
             if (comp.first + m_allCompositions[comp.second]->getPlaytime() >= position) {
                 return comp.second;
             }
         }
     }
     return -1;
 }
 
 int TrackModel::getClipByRow(int row) const
 {
     READ_LOCK();
     if (row >= static_cast<int>(m_allClips.size())) {
         return -1;
     }
     auto it = m_allClips.cbegin();
     std::advance(it, row);
     return (*it).first;
 }
 
 std::unordered_set<int> TrackModel::getClipsInRange(int position, int end)
 {
     READ_LOCK();
     std::unordered_set<int> ids;
     for (const auto &clp : m_allClips) {
         int pos = clp.second->getPosition();
         int length = clp.second->getPlaytime();
         if (end > -1 && pos >= end) {
             continue;
         }
         if (pos >= position || pos + length - 1 >= position) {
             ids.insert(clp.first);
         }
     }
     return ids;
 }
 
 int TrackModel::getRowfromClip(int clipId) const
 {
     READ_LOCK();
     Q_ASSERT(m_allClips.count(clipId) > 0);
     return int(std::distance(m_allClips.begin(), m_allClips.find(clipId)));
 }
 
 std::unordered_set<int> TrackModel::getCompositionsInRange(int position, int end)
 {
     READ_LOCK();
     // TODO: this function doesn't take into accounts the fact that there are two tracks
     std::unordered_set<int> ids;
     for (const auto &compo : m_allCompositions) {
         int pos = compo.second->getPosition();
         int length = compo.second->getPlaytime();
         if (end > -1 && pos >= end) {
             continue;
         }
         if (pos >= position || pos + length - 1 >= position) {
 
             ids.insert(compo.first);
         }
     }
     return ids;
 }
 
 int TrackModel::getRowfromComposition(int tid) const
 {
     READ_LOCK();
     Q_ASSERT(m_allCompositions.count(tid) > 0);
     return int(m_allClips.size()) + int(std::distance(m_allCompositions.begin(), m_allCompositions.find(tid)));
 }
 
 QVariant TrackModel::getProperty(const QString &name) const
 {
     READ_LOCK();
     return QString(m_track->get(name.toUtf8().constData()));
 }
 
 void TrackModel::setProperty(const QString &name, const QString &value)
 {
     QWriteLocker locker(&m_lock);
     m_track->set(name.toUtf8().constData(), value.toUtf8().constData());
     // Hide property must be defined at playlist level or it won't be saved
     if (name == QLatin1String("kdenlive:audio_track") || name == QLatin1String("hide")) {
         for (auto &m_playlist : m_playlists) {
             m_playlist.set(name.toUtf8().constData(), value.toInt());
         }
     }
 }
 
 bool TrackModel::checkConsistency()
 {
     auto ptr = m_parent.lock();
     if (!ptr) {
         return false;
     }
     auto check_blank_zone = [&](int playlist, int in, int out) {
         if (in >= m_playlists[playlist].get_playtime()) {
             return true;
         }
         int index = m_playlists[playlist].get_clip_index_at(in);
         if (!m_playlists[playlist].is_blank(index)) {
             return false;
         }
         int cin = m_playlists[playlist].clip_start(index);
         if (cin > in) {
             return false;
         }
         if (cin + m_playlists[playlist].clip_length(index) - 1 < out) {
             return false;
         }
         return true;
     };
     std::vector<std::pair<int, int>> clips; // clips stored by (position, id)
     for (const auto &c : m_allClips) {
         Q_ASSERT(c.second);
         Q_ASSERT(c.second.get() == ptr->getClipPtr(c.first).get());
         clips.emplace_back(c.second->getPosition(), c.first);
     }
     std::sort(clips.begin(), clips.end());
     int last_out = 0;
     for (size_t i = 0; i < clips.size(); ++i) {
         auto cur_clip = m_allClips[clips[i].second];
         if (last_out < clips[i].first) {
             // we have some blank space before this clip, check it
             for (int pl = 0; pl <= 1; ++pl) {
                 if (!check_blank_zone(pl, last_out, clips[i].first - 1)) {
                     qDebug() << "ERROR: Some blank was required on playlist " << pl << " between " << last_out << " and " << clips[i].first - 1;
                     return false;
                 }
             }
         }
         int cur_playlist = cur_clip->getSubPlaylistIndex();
         int clip_index = m_playlists[cur_playlist].get_clip_index_at(clips[i].first);
         if (m_playlists[cur_playlist].is_blank(clip_index)) {
             qDebug() << "ERROR: Found blank when clip was required at position " << clips[i].first;
             return false;
         }
         if (m_playlists[cur_playlist].clip_start(clip_index) != clips[i].first) {
             qDebug() << "ERROR: Inconsistent start position for clip at position " << clips[i].first;
             return false;
         }
         if (m_playlists[cur_playlist].clip_start(clip_index) != clips[i].first) {
             qDebug() << "ERROR: Inconsistent start position for clip at position " << clips[i].first;
             return false;
         }
         if (m_playlists[cur_playlist].clip_length(clip_index) != cur_clip->getPlaytime()) {
             qDebug() << "ERROR: Inconsistent length for clip at position " << clips[i].first;
             return false;
         }
         auto pr = m_playlists[cur_playlist].get_clip(clip_index);
         Mlt::Producer prod(pr);
         if (!prod.same_clip(*cur_clip)) {
             qDebug() << "ERROR: Wrong clip at position " << clips[i].first;
             delete pr;
             return false;
         }
         delete pr;
 
         // the current playlist is valid, we check that the other is essentially blank
         int other_playlist = (cur_playlist + 1) % 2;
         int in_blank = clips[i].first;
         int out_blank = clips[i].first + cur_clip->getPlaytime() - 1;
 
         // the previous clip on the same playlist must not intersect
         int prev_clip_id_same_playlist = -1;
         for (int j = int(i) - 1; j >= 0; --j) {
             if (cur_playlist == m_allClips[clips[size_t(j)].second]->getSubPlaylistIndex()) {
                 prev_clip_id_same_playlist = j;
                 break;
             }
         }
         if (prev_clip_id_same_playlist >= 0 &&
             clips[size_t(prev_clip_id_same_playlist)].first + m_allClips[clips[size_t(prev_clip_id_same_playlist)].second]->getPlaytime() > clips[i].first) {
             qDebug() << "ERROR: found overlapping clips at position " << clips[i].first;
             return false;
         }
 
         // the previous clip on the other playlist might restrict the blank in/out
         int prev_clip_id_other_playlist = -1;
         for (int j = int(i) - 1; j >= 0; --j) {
             if (other_playlist == m_allClips[clips[size_t(j)].second]->getSubPlaylistIndex()) {
                 prev_clip_id_other_playlist = j;
                 break;
             }
         }
         if (prev_clip_id_other_playlist >= 0) {
             in_blank = std::max(in_blank, clips[size_t(prev_clip_id_other_playlist)].first +
                                               m_allClips[clips[size_t(prev_clip_id_other_playlist)].second]->getPlaytime());
         }
 
         // the next clip on the other playlist might restrict the blank in/out
         int next_clip_id_other_playlist = -1;
         for (size_t j = i + 1; j < clips.size(); ++j) {
             if (other_playlist == m_allClips[clips[j].second]->getSubPlaylistIndex()) {
                 next_clip_id_other_playlist = int(j);
                 break;
             }
         }
         if (next_clip_id_other_playlist >= 0) {
             out_blank = std::min(out_blank, clips[size_t(next_clip_id_other_playlist)].first - 1);
         }
         if (in_blank <= out_blank && !check_blank_zone(other_playlist, in_blank, out_blank)) {
             qDebug() << "ERROR: we expected blank on playlist " << other_playlist << " between " << in_blank << " and " << out_blank;
             return false;
         }
 
         last_out = clips[i].first + cur_clip->getPlaytime();
     }
     int playtime = std::max(m_playlists[0].get_playtime(), m_playlists[1].get_playtime());
     if (!clips.empty() && playtime != clips.back().first + m_allClips[clips.back().second]->getPlaytime()) {
         qDebug() << "Error: playtime is " << playtime << " but was expected to be" << clips.back().first + m_allClips[clips.back().second]->getPlaytime();
         return false;
     }
 
     // We now check compositions positions
     if (m_allCompositions.size() != m_compoPos.size()) {
         qDebug() << "Error: the number of compositions position doesn't match number of compositions";
         return false;
     }
     for (const auto &compo : m_allCompositions) {
         int pos = compo.second->getPosition();
         if (m_compoPos.count(pos) == 0) {
             qDebug() << "Error: the position of composition " << compo.first << " is not properly stored";
             return false;
         }
         if (m_compoPos[pos] != compo.first) {
             qDebug() << "Error: found composition" << m_compoPos[pos] << "instead of " << compo.first << "at position" << pos;
             return false;
         }
     }
     for (auto it = m_compoPos.begin(); it != m_compoPos.end(); ++it) {
         int compoId = it->second;
         int cur_in = m_allCompositions[compoId]->getPosition();
         Q_ASSERT(cur_in == it->first);
         int cur_out = cur_in + m_allCompositions[compoId]->getPlaytime() - 1;
         ++it;
         if (it != m_compoPos.end()) {
             int next_compoId = it->second;
             int next_in = m_allCompositions[next_compoId]->getPosition();
             int next_out = next_in + m_allCompositions[next_compoId]->getPlaytime() - 1;
             if (next_in <= cur_out) {
                 qDebug() << "Error: found collision between composition " << compoId << "[ " << cur_in << ", " << cur_out << "] and " << next_compoId << "[ "
                          << next_in << ", " << next_out << "]";
                 return false;
             }
         }
         --it;
     }
     // Check Mixes
     QScopedPointer<Mlt::Service> service(m_track->field());
     int mixCount = 0;
     while (service != nullptr && service->is_valid()) {
         if (service->type() == mlt_service_transition_type) {
             Mlt::Transition t(mlt_transition(service->get_service()));
             service.reset(service->producer());
             // Check that the mix has correct in/out
             int mainId = -1;
             int mixIn = t.get_in();
             for (auto &sameComposition : m_sameCompositions) {
                 if (static_cast<Mlt::Transition *>(sameComposition.second->getAsset())->get_in() == mixIn) {
                     // Found mix in list
                     mainId = sameComposition.first;
                     break;
                 }
             }
             if (mainId == -1) {
                 qDebug() << "=== Incoherent mix found at: " << mixIn;
                 return false;
             }
             // Check in/out)
             if (mixIn != m_allClips[mainId]->getPosition()) {
                 qDebug() << "=== Mix not aligned with its master clip: " << mainId << ", at: " << m_allClips[mainId]->getPosition() << ", MIX at: " << mixIn;
                 return false;
             }
             int secondClipId = m_mixList.key(mainId);
             if (t.get_out() != m_allClips[secondClipId]->getPosition() + m_allClips[secondClipId]->getPlaytime()) {
                 qDebug() << "=== Mix not aligned with its second clip: " << secondClipId
                          << ", end at: " << m_allClips[secondClipId]->getPosition() + m_allClips[secondClipId]->getPlaytime() << ", MIX at: " << t.get_out();
                 return false;
             }
             mixCount++;
         } else {
             service.reset(service->producer());
         }
     }
     if (mixCount != static_cast<int>(m_sameCompositions.size()) || static_cast<int>(m_sameCompositions.size()) != m_mixList.count()) {
         // incoherent mix count
         qDebug() << "=== INCORRECT mix count. Existing: " << mixCount << "; REGISTERED: " << m_mixList.count();
         return false;
     }
     return true;
 }
 
 std::pair<int, int> TrackModel::getClipIndexAt(int position, int playlist)
 {
     READ_LOCK();
     if (playlist == -1) {
         for (int j = 0; j < 2; j++) {
             if (!m_playlists[j].is_blank_at(position)) {
                 return {j, m_playlists[j].get_clip_index_at(position)};
             }
         }
         return {-1, -1};
     }
     if (!m_playlists[playlist].is_blank_at(position)) {
         return {playlist, m_playlists[playlist].get_clip_index_at(position)};
     }
     qDebug() << "=== CANNOT FIND CLIP ON PLAYLIST: " << playlist << " AT POSITION: " << position << ", TID: " << m_id;
     Q_ASSERT(false);
     return {-1, -1};
 }
 
 bool TrackModel::isLastClip(int position)
 {
     READ_LOCK();
     for (auto &m_playlist : m_playlists) {
         if (!m_playlist.is_blank_at(position)) {
             return m_playlist.get_clip_index_at(position) == m_playlist.count() - 1;
         }
     }
     return false;
 }
 
 bool TrackModel::isBlankAt(int position, int playlist)
 {
     READ_LOCK();
     if (playlist == -1) {
         return m_playlists[0].is_blank_at(position) && m_playlists[1].is_blank_at(position);
     }
     return m_playlists[playlist].is_blank_at(position);
 }
 
 int TrackModel::getNextBlankStart(int position)
 {
     while (!isBlankAt(position)) {
         int end1 = getClipEnd(position, 0);
         int end2 = getClipEnd(position, 1);
         if (end1 > position) {
             position = end1;
         } else if (end2 > position) {
             position = end2;
         } else {
             // We reached playlist end
             return -1;
         }
     }
     return getBlankStart(position);
 }
 
 int TrackModel::getBlankStart(int position)
 {
     READ_LOCK();
     int result = 0;
     for (auto &playlist : m_playlists) {
         if (playlist.count() == 0) {
             break;
         }
         if (!playlist.is_blank_at(position)) {
             result = position;
             break;
         }
         int clip_index = playlist.get_clip_index_at(position);
         int start = playlist.clip_start(clip_index);
         if (start > result) {
             result = start;
         }
     }
     return result;
 }
 
 int TrackModel::getClipStart(int position, int track)
 {
     if (track == -1) {
         return getBlankStart(position);
     }
     READ_LOCK();
     if (m_playlists[track].is_blank_at(position)) {
         return position;
     }
     int clip_index = m_playlists[track].get_clip_index_at(position);
     return m_playlists[track].clip_start(clip_index);
 }
 
 int TrackModel::getClipEnd(int position, int track)
 {
     if (track == -1) {
         return getBlankStart(position);
     }
     READ_LOCK();
     if (m_playlists[track].is_blank_at(position)) {
         return position;
     }
     int clip_index = m_playlists[track].get_clip_index_at(position);
     clip_index++;
     return m_playlists[track].clip_start(clip_index);
 }
 
 int TrackModel::getBlankStart(int position, int track)
 {
     if (track == -1) {
         return getBlankStart(position);
     }
     READ_LOCK();
     int result = 0;
     if (!m_playlists[track].is_blank_at(position)) {
         return position;
     }
     int clip_index = m_playlists[track].get_clip_index_at(position);
     int start = m_playlists[track].clip_start(clip_index);
     if (start > result) {
         result = start;
     }
     return result;
 }
 
 int TrackModel::getBlankEnd(int position, int track)
 {
     if (track == -1) {
         return getBlankEnd(position);
     }
     READ_LOCK();
     // Q_ASSERT(m_playlists[track].is_blank_at(position));
     if (!m_playlists[track].is_blank_at(position)) {
         return position;
     }
     int clip_index = m_playlists[track].get_clip_index_at(position);
     int count = m_playlists[track].count();
     if (clip_index < count) {
         int blank_start = m_playlists[track].clip_start(clip_index);
         int blank_length = m_playlists[track].clip_length(clip_index) - 1;
         return blank_start + blank_length;
     }
     return INT_MAX;
 }
 
 int TrackModel::getBlankEnd(int position)
 {
     READ_LOCK();
     int end = INT_MAX;
     for (int j = 0; j < 2; j++) {
         end = std::min(getBlankEnd(position, j), end);
     }
     return end;
 }
 
 Fun TrackModel::requestCompositionResize_lambda(int compoId, int in, int out, bool logUndo)
 {
     QWriteLocker locker(&m_lock);
     int compo_position = m_allCompositions[compoId]->getPosition();
     Q_ASSERT(m_compoPos.count(compo_position) > 0);
     Q_ASSERT(m_compoPos[compo_position] == compoId);
     int old_in = compo_position;
     int old_out = old_in + m_allCompositions[compoId]->getPlaytime() - 1;
     qDebug() << "compo resize " << compoId << in << "-" << out << " / " << old_in << "-" << old_out;
     if (out == -1) {
         out = in + old_out - old_in;
     }
 
     auto update_snaps = [old_in, old_out, logUndo, this](int new_in, int new_out) {
         if (auto ptr = m_parent.lock()) {
             ptr->m_snaps->removePoint(old_in);
             ptr->m_snaps->removePoint(old_out + 1);
             ptr->m_snaps->addPoint(new_in);
             ptr->m_snaps->addPoint(new_out);
             ptr->checkRefresh(old_in, old_out);
             ptr->checkRefresh(new_in, new_out);
             if (logUndo) {
                 Q_EMIT ptr->invalidateZone(old_in, old_out);
                 Q_EMIT ptr->invalidateZone(new_in, new_out);
             }
             // ptr->adjustAssetRange(compoId, new_in, new_out);
         } else {
             qDebug() << "Error : Composition resize failed because parent timeline is not available anymore";
             Q_ASSERT(false);
         }
     };
 
     if (in == compo_position && (out == -1 || out == old_out)) {
         return []() {
             qDebug() << "//// NO MOVE PERFORMED\n!!!!!!!!!!!!!!!!!!!!!!!!!!";
             return true;
         };
     }
 
     // temporary remove of current compo to check collisions
     qDebug() << "// CURRENT COMPOSITIONS ----\n" << m_compoPos << "\n--------------";
     m_compoPos.erase(compo_position);
     bool intersecting = hasIntersectingComposition(in, out);
     // put it back
     m_compoPos[compo_position] = compoId;
 
     if (intersecting) {
         return []() {
             qDebug() << "//// FALSE MOVE PERFORMED\n!!!!!!!!!!!!!!!!!!!!!!!!!!";
             return false;
         };
     }
 
     return [in, out, compoId, update_snaps, this]() {
         if (isLocked()) return false;
         m_compoPos.erase(m_allCompositions[compoId]->getPosition());
         m_allCompositions[compoId]->setInOut(in, out);
         update_snaps(in, out + 1);
         m_compoPos[m_allCompositions[compoId]->getPosition()] = compoId;
         return true;
     };
 }
 
 bool TrackModel::requestCompositionInsertion(int compoId, int position, bool updateView, bool finalMove, Fun &undo, Fun &redo)
 {
     QWriteLocker locker(&m_lock);
     if (isLocked()) {
         return false;
     }
     auto operation = requestCompositionInsertion_lambda(compoId, position, updateView, finalMove);
     if (operation()) {
         auto reverse = requestCompositionDeletion_lambda(compoId, updateView, finalMove);
         UPDATE_UNDO_REDO(operation, reverse, undo, redo);
         return true;
     }
     return false;
 }
 
 bool TrackModel::requestCompositionDeletion(int compoId, bool updateView, bool finalMove, Fun &undo, Fun &redo, bool finalDeletion)
 {
     QWriteLocker locker(&m_lock);
     if (isLocked()) {
         return false;
     }
     Q_ASSERT(m_allCompositions.count(compoId) > 0);
     auto old_composition = m_allCompositions[compoId];
     int old_position = old_composition->getPosition();
     Q_ASSERT(m_compoPos.count(old_position) > 0);
     Q_ASSERT(m_compoPos[old_position] == compoId);
     auto operation = requestCompositionDeletion_lambda(compoId, updateView, finalMove && finalDeletion);
     if (operation()) {
         auto reverse = requestCompositionInsertion_lambda(compoId, old_position, updateView, finalMove);
         UPDATE_UNDO_REDO(operation, reverse, undo, redo);
         return true;
     }
     return false;
 }
 
 Fun TrackModel::requestCompositionDeletion_lambda(int compoId, bool updateView, bool finalMove)
 {
     QWriteLocker locker(&m_lock);
     // Find index of clip
     int clip_position = m_allCompositions[compoId]->getPosition();
     int old_in = clip_position;
     int old_out = old_in + m_allCompositions[compoId]->getPlaytime();
     return [compoId, old_in, old_out, updateView, finalMove, this]() {
         if (isLocked()) return false;
         int old_clip_index = getRowfromComposition(compoId);
         if (finalMove && m_allCompositions[compoId]->selected) {
             m_allCompositions[compoId]->selected = false;
             if (auto ptr = m_parent.lock()) {
                 // item was selected, unselect
                 ptr->requestClearSelection(true);
             }
         }
         auto ptr = m_parent.lock();
         if (updateView) {
             ptr->_beginRemoveRows(ptr->makeTrackIndexFromID(getId()), old_clip_index, old_clip_index);
             ptr->_endRemoveRows();
         }
         m_allCompositions[compoId]->setCurrentTrackId(-1);
         m_allCompositions.erase(compoId);
         m_compoPos.erase(old_in);
         ptr->m_snaps->removePoint(old_in);
         ptr->m_snaps->removePoint(old_out);
         if (finalMove) {
             Q_EMIT ptr->invalidateZone(old_in, old_out);
         }
         return true;
     };
 }
 
 int TrackModel::getCompositionByRow(int row) const
 {
     READ_LOCK();
     if (row < int(m_allClips.size())) {
         return -1;
     }
     Q_ASSERT(row <= int(m_allClips.size() + m_allCompositions.size()));
     auto it = m_allCompositions.cbegin();
     std::advance(it, row - int(m_allClips.size()));
     return (*it).first;
 }
 
 int TrackModel::getCompositionsCount() const
 {
     READ_LOCK();
     return int(m_allCompositions.size());
 }
 
 Fun TrackModel::requestCompositionInsertion_lambda(int compoId, int position, bool updateView, bool finalMove)
 {
     QWriteLocker locker(&m_lock);
     bool intersecting = true;
     if (auto ptr = m_parent.lock()) {
         intersecting = hasIntersectingComposition(position, position + ptr->getCompositionPlaytime(compoId) - 1);
     } else {
         qDebug() << "Error : Composition Insertion failed because timeline is not available anymore";
     }
     if (!intersecting) {
         return [compoId, this, position, updateView, finalMove]() {
             if (isLocked()) return false;
             if (auto ptr = m_parent.lock()) {
                 std::shared_ptr<CompositionModel> composition = ptr->getCompositionPtr(compoId);
                 m_allCompositions[composition->getId()] = composition; // store clip
                 // update clip position and track
                 composition->setCurrentTrackId(getId());
                 int new_in = position;
                 int new_out = new_in + composition->getPlaytime();
                 composition->setInOut(new_in, new_out - 1);
                 if (updateView) {
                     int composition_index = getRowfromComposition(composition->getId());
                     ptr->_beginInsertRows(ptr->makeTrackIndexFromID(composition->getCurrentTrackId()), composition_index, composition_index);
                     ptr->_endInsertRows();
                 }
                 ptr->m_snaps->addPoint(new_in);
                 ptr->m_snaps->addPoint(new_out);
                 m_compoPos[new_in] = composition->getId();
                 if (finalMove) {
                     Q_EMIT ptr->invalidateZone(new_in, new_out);
                 }
                 return true;
             }
             qDebug() << "Error : Composition Insertion failed because timeline is not available anymore";
             return false;
         };
     }
     return []() { return false; };
 }
 
 bool TrackModel::hasIntersectingComposition(int in, int out) const
 {
     READ_LOCK();
     auto it = m_compoPos.lower_bound(in);
     if (m_compoPos.empty()) {
         return false;
     }
     if (it != m_compoPos.end() && it->first <= out) {
         // compo at it intersects
         return true;
     }
     if (it == m_compoPos.begin()) {
         return false;
     }
     --it;
     int end = it->first + m_allCompositions.at(it->second)->getPlaytime() - 1;
     return end >= in;
 
     return false;
 }
 
 bool TrackModel::addEffect(const QString &effectId)
 {
     READ_LOCK();
     return m_effectStack->appendEffect(effectId);
 }
 
 const QString TrackModel::effectNames() const
 {
     READ_LOCK();
     return m_effectStack->effectNames();
 }
 
 bool TrackModel::stackEnabled() const
 {
     READ_LOCK();
     return m_effectStack->isStackEnabled();
 }
 
 void TrackModel::setEffectStackEnabled(bool enable)
 {
     m_effectStack->setEffectStackEnabled(enable);
 }
 
 int TrackModel::trackDuration() const
 {
     return m_track->get_length();
 }
 
 bool TrackModel::isLocked() const
 {
     READ_LOCK();
     return m_track->get_int("kdenlive:locked_track");
 }
 
 bool TrackModel::isTimelineActive() const
 {
     READ_LOCK();
     return m_track->get_int("kdenlive:timeline_active");
 }
 
 bool TrackModel::shouldReceiveTimelineOp() const
 {
     READ_LOCK();
     return isTimelineActive() && !isLocked();
 }
 
 bool TrackModel::isAudioTrack() const
 {
     return m_track->get_int("kdenlive:audio_track") == 1;
 }
 
 Mlt::Tractor *TrackModel::getTrackService()
 {
     return m_track.get();
 }
 
 PlaylistState::ClipState TrackModel::trackType() const
 {
     return (m_track->get_int("kdenlive:audio_track") == 1 ? PlaylistState::AudioOnly : PlaylistState::VideoOnly);
 }
 
 bool TrackModel::isHidden() const
 {
     return m_track->get_int("hide") & 1;
 }
 
 bool TrackModel::isMute() const
 {
     return m_track->get_int("hide") & 2;
 }
 
 bool TrackModel::importEffects(std::weak_ptr<Mlt::Service> service)
 {
     QWriteLocker locker(&m_lock);
     m_effectStack->importEffects(std::move(service), trackType());
     return true;
 }
 
 bool TrackModel::copyEffect(const std::shared_ptr<EffectStackModel> &stackModel, int rowId)
 {
     QWriteLocker locker(&m_lock);
     return m_effectStack->copyEffect(stackModel->getEffectStackRow(rowId), isAudioTrack() ? PlaylistState::AudioOnly : PlaylistState::VideoOnly);
 }
 
 void TrackModel::lock()
 {
     setProperty(QStringLiteral("kdenlive:locked_track"), QStringLiteral("1"));
     if (auto ptr = m_parent.lock()) {
         QModelIndex ix = ptr->makeTrackIndexFromID(m_id);
         Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::IsLockedRole});
     }
 }
 void TrackModel::unlock()
 {
     setProperty(QStringLiteral("kdenlive:locked_track"), nullptr);
     if (auto ptr = m_parent.lock()) {
         QModelIndex ix = ptr->makeTrackIndexFromID(m_id);
         Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::IsLockedRole});
     }
 }
 
 bool TrackModel::isAvailable(int position, int duration, int playlist)
 {
     if (playlist == -1) {
         // Check on both playlists
         for (auto &pl : m_playlists) {
             int start_clip = pl.get_clip_index_at(position);
             int end_clip = pl.get_clip_index_at(position + duration - 1);
             if (start_clip != end_clip || !pl.is_blank(start_clip)) {
                 return false;
             }
         }
         return true;
     }
     int start_clip = m_playlists[playlist].get_clip_index_at(position);
     int end_clip = m_playlists[playlist].get_clip_index_at(position + duration - 1);
     if (start_clip != end_clip) {
         return false;
     }
     return m_playlists[playlist].is_blank(start_clip);
 }
 
 bool TrackModel::isAvailableWithExceptions(int position, int duration, const QVector<int> &exceptions)
 {
     // Check on both playlists
     QSharedPointer<Mlt::Producer> prod = nullptr;
     for (auto &playlist : m_playlists) {
         int start_clip = playlist.get_clip_index_at(position);
         int end_clip = playlist.get_clip_index_at(position + duration - 1);
         for (int ix = start_clip; ix <= end_clip; ix++) {
             if (playlist.is_blank(ix)) {
                 continue;
             }
             prod.reset(playlist.get_clip(ix));
             if (prod) {
                 if (!exceptions.contains(prod->get_int("_kdenlive_cid"))) {
                     return false;
                 }
             }
         }
     }
     return true;
 }
 
 bool TrackModel::requestRemoveMix(std::pair<int, int> clipIds, Fun &undo, Fun &redo)
 {
     int mixDuration;
     int mixCutPos;
     int endPos;
     int firstInPos;
     int secondInPos;
     int mixPosition;
     int src_track = 0;
     int first_src_track = 0;
     bool secondClipHasEndMix = false;
     bool firstClipHasStartMix = false;
     QList<int> allowedMixes = {clipIds.first};
     if (auto ptr = m_parent.lock()) {
         // The clip that will be moved to playlist 1
         std::shared_ptr<ClipModel> firstClip(ptr->getClipPtr(clipIds.first));
         std::shared_ptr<ClipModel> secondClip(ptr->getClipPtr(clipIds.second));
         mixDuration = secondClip->getMixDuration();
         mixCutPos = secondClip->getMixCutPosition();
         mixPosition = secondClip->getPosition();
         firstInPos = firstClip->getPosition();
         secondInPos = mixPosition + mixDuration - mixCutPos;
         endPos = mixPosition + secondClip->getPlaytime();
         secondClipHasEndMix = hasEndMix(clipIds.second);
         firstClipHasStartMix = hasStartMix(clipIds.first);
         src_track = secondClip->getSubPlaylistIndex();
         first_src_track = firstClip->getSubPlaylistIndex();
     } else {
         return false;
     }
     bool result = false;
     bool closing = false;
     Fun local_undo = []() { return true; };
     Fun local_redo = []() { return true; };
     if (auto ptr = m_parent.lock()) {
         // Resize first part clip
         closing = ptr->m_closing;
         if (closing) {
             result = true;
         } else {
             result = ptr->getClipPtr(clipIds.first)->requestResize(secondInPos - firstInPos, true, local_undo, local_redo, true, true);
             // Resize main clip
             result = result && ptr->getClipPtr(clipIds.second)->requestResize(endPos - secondInPos, false, local_undo, local_redo, true, true);
         }
     }
     if (result) {
         QString assetId = m_sameCompositions[clipIds.second]->getAssetId();
         QVector<QPair<QString, QVariant>> params = m_sameCompositions[clipIds.second]->getAllParameters();
         std::pair<int, int> tracks = getMixTracks(clipIds.second);
         bool switchSecondTrack = false;
         bool switchFirstTrack = false;
         if (src_track == 1 && !secondClipHasEndMix && !closing) {
             switchSecondTrack = true;
         }
         if (first_src_track == 1 && !firstClipHasStartMix && !closing) {
             switchFirstTrack = true;
         }
         Fun replay = [this, clipIds, firstInPos, secondInPos, switchFirstTrack, switchSecondTrack]() {
             if (switchFirstTrack) {
                 // Revert clip to playlist 0 since it has no mix
                 switchPlaylist(clipIds.first, firstInPos, 1, 0);
             }
             if (switchSecondTrack) {
                 // Revert clip to playlist 0 since it has no mix
                 switchPlaylist(clipIds.second, secondInPos, 1, 0);
             }
             // Delete transition
             Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[clipIds.second]->getAsset());
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(transition);
             field->unlock();
             m_sameCompositions.erase(clipIds.second);
             m_mixList.remove(clipIds.first);
             if (auto ptr = m_parent.lock()) {
                 std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipIds.second));
                 movedClip->setMixDuration(0);
                 /*QModelIndex ix = ptr->makeClipIndexFromID(clipIds.first);
                 Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::DurationRole});*/
                 QModelIndex ix2 = ptr->makeClipIndexFromID(clipIds.second);
                 Q_EMIT ptr->dataChanged(ix2, ix2, {TimelineModel::MixRole, TimelineModel::MixCutRole});
             }
             return true;
         };
         replay();
         Fun reverse = [this, clipIds, assetId, params, tracks, mixDuration, mixPosition, mixCutPos, firstInPos, secondInPos, switchFirstTrack,
                        switchSecondTrack]() {
             // First restore correct playlist
             if (switchFirstTrack) {
                 // Revert clip to playlist 1
                 switchPlaylist(clipIds.first, firstInPos, 0, 1);
             }
             if (switchSecondTrack) {
                 // Revert clip to playlist 1
                 switchPlaylist(clipIds.second, secondInPos, 0, 1);
             }
             // Build mix
             if (auto ptr = m_parent.lock()) {
                 std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipIds.second));
                 movedClip->setMixDuration(mixDuration, mixCutPos);
                 // Insert mix transition
                 std::unique_ptr<Mlt::Transition> t = TransitionsRepository::get()->getTransition(assetId);
                 t->set_in_and_out(mixPosition, mixPosition + mixDuration);
                 t->set("kdenlive:mixcut", mixCutPos);
                 t->set("kdenlive_id", assetId.toUtf8().constData());
                 t->set_tracks(tracks.first, tracks.second);
                 m_track->plant_transition(*t.get(), tracks.first, tracks.second);
                 QDomElement xml = TransitionsRepository::get()->getXml(assetId);
                 QDomNodeList xmlParams = xml.elementsByTagName(QStringLiteral("parameter"));
                 for (int i = 0; i < xmlParams.count(); ++i) {
                     QDomElement currentParameter = xmlParams.item(i).toElement();
                     QString paramName = currentParameter.attribute(QStringLiteral("name"));
                     for (const auto &p : qAsConst(params)) {
                         if (p.first == paramName) {
                             currentParameter.setAttribute(QStringLiteral("value"), p.second.toString());
                             break;
                         }
                     }
                 }
                 std::shared_ptr<AssetParameterModel> asset(
                     new AssetParameterModel(std::move(t), xml, assetId, ObjectId(KdenliveObjectType::TimelineMix, clipIds.second, ptr->uuid()), QString()));
                 m_sameCompositions[clipIds.second] = asset;
                 m_mixList.insert(clipIds.first, clipIds.second);
                 QModelIndex ix2 = ptr->makeClipIndexFromID(clipIds.second);
                 Q_EMIT ptr->dataChanged(ix2, ix2, {TimelineModel::MixRole, TimelineModel::MixCutRole});
             }
             return true;
         };
         PUSH_LAMBDA(replay, local_redo);
         PUSH_FRONT_LAMBDA(reverse, local_undo);
         UPDATE_UNDO_REDO(local_redo, local_undo, undo, redo);
         return true;
     }
     return false;
 }
 
 bool TrackModel::requestClipMix(const QString &mixId, std::pair<int, int> clipIds, std::pair<int, int> mixDurations, bool updateView, bool finalMove, Fun &undo,
                                 Fun &redo, bool groupMove)
 {
     QWriteLocker locker(&m_lock);
     // By default, insertion occurs in topmost track
     // Find out the clip id at position
     int firstClipPos;
     int secondClipPos;
     int secondClipDuration;
     int firstClipDuration;
     int source_track;
     int mixPosition;
     int secondClipCut = 0;
     int dest_track = 1;
     bool remixPlaylists = false;
     bool clipHasEndMix = false;
     if (auto ptr = m_parent.lock()) {
         // The clip that will be moved to playlist 1
         std::shared_ptr<ClipModel> secondClip(ptr->getClipPtr(clipIds.second));
         secondClipDuration = secondClip->getPlaytime();
         secondClipPos = secondClip->getPosition();
         source_track = secondClip->getSubPlaylistIndex();
         std::shared_ptr<ClipModel> firstClip(ptr->getClipPtr(clipIds.first));
         firstClipDuration = firstClip->getPlaytime();
         // Ensure mix is not longer than clip and doesn't overlap other mixes
         firstClipPos = firstClip->getPosition();
         if (firstClip->getSubPlaylistIndex() == 1) {
             dest_track = 0;
         }
         mixPosition = qMax(firstClipPos, secondClipPos - mixDurations.second);
         int maxPos = qMin(secondClipPos + secondClipDuration, secondClipPos + mixDurations.first);
         if (hasStartMix(clipIds.first)) {
             std::pair<MixInfo, MixInfo> mixData = getMixInfo(clipIds.first);
             mixPosition = qMax(mixData.first.firstClipInOut.second, mixPosition);
         }
         if (hasEndMix(clipIds.second)) {
             std::pair<MixInfo, MixInfo> mixData = getMixInfo(clipIds.second);
             clipHasEndMix = true;
             maxPos = qMin(mixData.second.secondClipInOut.first, maxPos);
             if (ptr->m_allClips[mixData.second.secondClipId]->getSubPlaylistIndex() == dest_track) {
                 remixPlaylists = true;
             }
         }
         mixDurations.first = qMin(mixDurations.first, maxPos - mixPosition);
         secondClipCut = maxPos - secondClipPos;
     } else {
         // Error, timeline unavailable
         qDebug() << "=== ERROR NO TIMELINE!!!!";
         return false;
     }
 
     // Rearrange subsequent mixes
     Fun rearrange_playlists = []() { return true; };
     Fun rearrange_playlists_undo = []() { return true; };
     if (remixPlaylists && source_track != dest_track) {
         // A list of clip ids x playlists
         QMap<int, int> rearrangedPlaylists;
         QMap<int, QVector<QPair<QString, QVariant>>> mixParameters;
         int ix = 0;
         int moveId = m_mixList.value(clipIds.second, -1);
         while (moveId > -1) {
             int current = m_allClips[moveId]->getSubPlaylistIndex();
             rearrangedPlaylists.insert(moveId, current);
             QVector<QPair<QString, QVariant>> params = m_sameCompositions.at(moveId)->getAllParameters();
             mixParameters.insert(moveId, params);
             if (hasEndMix(moveId)) {
                 moveId = m_mixList.value(moveId, -1);
             } else {
                 break;
             }
             ix++;
         }
         rearrange_playlists = [this, map = rearrangedPlaylists]() {
             // First, remove all clips on playlist 0
             QMapIterator<int, int> i(map);
             while (i.hasNext()) {
                 i.next();
                 if (i.value() == 0) {
                     int target_clip = m_playlists[0].get_clip_index_at(m_allClips[i.key()]->getPosition());
                     std::unique_ptr<Mlt::Producer> prod(m_playlists[0].replace_with_blank(target_clip));
                 }
             }
             m_playlists[0].consolidate_blanks();
             // Then move all clips from playlist 1 to playlist 0
             i.toFront();
             if (auto ptr = m_parent.lock()) {
                 while (i.hasNext()) {
                     i.next();
                     if (i.value() == 1) {
                         // Remove
                         int pos = m_allClips[i.key()]->getPosition();
                         int target_clip = m_playlists[1].get_clip_index_at(pos);
                         std::unique_ptr<Mlt::Producer> prod(m_playlists[1].replace_with_blank(target_clip));
                         prod.reset();
                         // Replug
                         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(i.key());
                         clip->setSubPlaylistIndex(0, m_id);
                         int index = m_playlists[0].insert_at(pos, *clip, 1);
                         m_playlists[0].consolidate_blanks();
                         if (index == -1) {
                             // Something went wrong, abort
                             m_playlists[1].insert_at(pos, *clip, 1);
                             m_playlists[1].consolidate_blanks();
                             return false;
                         }
                     }
                 }
                 m_playlists[1].consolidate_blanks();
                 // Finally replug playlist 0 clips in playlist 1 and fix transition direction
                 i.toFront();
                 while (i.hasNext()) {
                     i.next();
                     if (i.value() == 0) {
                         int pos = m_allClips[i.key()]->getPosition();
                         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(i.key());
                         clip->setSubPlaylistIndex(1, m_id);
                         int index = m_playlists[1].insert_at(pos, *clip, 1);
                         m_playlists[1].consolidate_blanks();
                         if (index == -1) {
                             // Something went wrong, abort
                             m_playlists[0].insert_at(pos, *clip, 1);
                             m_playlists[0].consolidate_blanks();
                             return false;
                         }
                     }
                     std::unique_ptr<Mlt::Field> field(m_track->field());
                     field->block();
                     if (m_sameCompositions.count(i.key()) > 0) {
                         // There is a mix at clip start, adjust direction
                         Mlt::Properties *props = m_sameCompositions[i.key()]->getAsset();
                         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[i.key()]->getAsset());
                         bool reverse = i.value() == 1;
                         const QString assetName = m_sameCompositions[i.key()]->getAssetId();
                         const ObjectId ownerId = m_sameCompositions[i.key()]->getOwnerId();
                         field->disconnect_service(transition);
                         std::unique_ptr<Mlt::Transition> newTrans = TransitionsRepository::get()->getTransition(m_sameCompositions[i.key()]->getAssetId());
                         newTrans->inherit(*props);
                         updateCompositionDirection(*newTrans.get(), reverse);
                         m_sameCompositions.erase(i.key());
                         QDomElement xml = TransitionsRepository::get()->getXml(assetName);
                         std::shared_ptr<AssetParameterModel> asset(new AssetParameterModel(std::move(newTrans), xml, assetName, ownerId, QString()));
                         m_sameCompositions[i.key()] = asset;
                     }
                     field->unblock();
                 }
                 return true;
             } else {
                 return false;
             }
         };
         rearrange_playlists_undo = [this, map = rearrangedPlaylists, mixParameters]() {
             // First, remove all clips on playlist 1
             QMapIterator<int, int> i(map);
             while (i.hasNext()) {
                 i.next();
                 if (i.value() == 0) {
                     int target_clip = m_playlists[1].get_clip_index_at(m_allClips[i.key()]->getPosition());
                     std::unique_ptr<Mlt::Producer> prod(m_playlists[1].replace_with_blank(target_clip));
                 }
                 m_playlists[1].consolidate_blanks();
             }
             // Then move all clips from playlist 0 to playlist 1
             i.toFront();
             if (auto ptr = m_parent.lock()) {
                 while (i.hasNext()) {
                     i.next();
                     if (i.value() == 1) {
                         // Remove
                         int pos = m_allClips[i.key()]->getPosition();
                         int target_clip = m_playlists[0].get_clip_index_at(pos);
                         std::unique_ptr<Mlt::Producer> prod(m_playlists[0].replace_with_blank(target_clip));
                         // Replug
                         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(i.key());
                         clip->setSubPlaylistIndex(1, m_id);
                         int index = m_playlists[1].insert_at(pos, *clip, 1);
                         m_playlists[1].consolidate_blanks();
                         if (index == -1) {
                             // Something went wrong, abort
                             m_playlists[0].insert_at(pos, *clip, 1);
                             m_playlists[0].consolidate_blanks();
                             return false;
                         }
                     }
                     m_playlists[0].consolidate_blanks();
                 }
                 // Finally replug playlist 1 clips in playlist 0 and fix transition direction
                 i.toFront();
                 while (i.hasNext()) {
                     i.next();
                     if (i.value() == 0) {
                         int pos = m_allClips[i.key()]->getPosition();
                         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(i.key());
                         clip->setSubPlaylistIndex(0, m_id);
                         int index = m_playlists[0].insert_at(pos, *clip, 1);
                         m_playlists[0].consolidate_blanks();
                         if (index == -1) {
                             // Something went wrong, abort
                             m_playlists[1].insert_at(pos, *clip, 1);
                             m_playlists[1].consolidate_blanks();
                             return false;
                         }
                     }
                     std::unique_ptr<Mlt::Field> field(m_track->field());
                     field->block();
                     if (m_sameCompositions.count(i.key()) > 0) {
                         // There is a mix at clip start, adjust direction
                         Mlt::Properties *props = m_sameCompositions[i.key()]->getAsset();
                         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[i.key()]->getAsset());
                         bool reverse = i.value() == 0;
                         const QString assetName = m_sameCompositions[i.key()]->getAssetId();
                         const ObjectId ownerId = m_sameCompositions[i.key()]->getOwnerId();
                         field->disconnect_service(transition);
                         std::unique_ptr<Mlt::Transition> newTrans = TransitionsRepository::get()->getTransition(m_sameCompositions[i.key()]->getAssetId());
                         newTrans->inherit(*props);
                         updateCompositionDirection(*newTrans.get(), reverse);
                         m_sameCompositions.erase(i.key());
                         QDomElement xml = TransitionsRepository::get()->getXml(assetName);
                         std::shared_ptr<AssetParameterModel> asset(new AssetParameterModel(std::move(newTrans), xml, assetName, ownerId, QString()));
                         m_sameCompositions[i.key()] = asset;
                     }
                     field->unblock();
                 }
                 return true;
             } else {
                 return false;
             }
         };
     }
     // Create mix compositing
     Fun build_mix = [clipIds, mixPosition, mixDurations, dest_track, secondClipCut, mixId, this]() {
         if (auto ptr = m_parent.lock()) {
             std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipIds.second));
             movedClip->setMixDuration(mixDurations.first + mixDurations.second, secondClipCut);
             // Insert mix transition
             QString assetName;
             std::unique_ptr<Mlt::Transition> t;
             QDomElement xml;
             if (isAudioTrack()) {
                 // Mix is the only audio transition
                 t = TransitionsRepository::get()->getTransition(QStringLiteral("mix"));
                 t->set_in_and_out(mixPosition, mixPosition + mixDurations.first + mixDurations.second);
                 t->set("kdenlive:mixcut", secondClipCut);
                 t->set("start", -1);
                 t->set("accepts_blanks", 1);
                 assetName = QStringLiteral("mix");
                 xml = TransitionsRepository::get()->getXml(assetName);
                 if (dest_track == 0) {
                     t->set("reverse", 1);
                     Xml::setXmlParameter(xml, QStringLiteral("reverse"), QStringLiteral("1"));
                 }
                 m_track->plant_transition(*t.get(), 0, 1);
             } else {
                 assetName = mixId.isEmpty() || mixId == QLatin1String("mix") ? QStringLiteral("luma") : mixId;
                 t = TransitionsRepository::get()->getTransition(assetName);
                 t->set_in_and_out(mixPosition, mixPosition + mixDurations.first + mixDurations.second);
                 xml = TransitionsRepository::get()->getXml(assetName);
                 t->set("kdenlive:mixcut", secondClipCut);
                 t->set("kdenlive_id", assetName.toUtf8().constData());
                 if (dest_track == 0) {
                     t->set_tracks(1, 0);
                     m_track->plant_transition(*t.get(), 1, 0);
                 } else {
                     t->set_tracks(0, 1);
                     m_track->plant_transition(*t.get(), 0, 1);
                 }
             }
             std::shared_ptr<AssetParameterModel> asset(
                 new AssetParameterModel(std::move(t), xml, assetName, ObjectId(KdenliveObjectType::TimelineMix, clipIds.second, ptr->uuid()), QString()));
             m_sameCompositions[clipIds.second] = asset;
             m_mixList.insert(clipIds.first, clipIds.second);
         }
         return true;
     };
 
     Fun destroy_mix = [clipIds, this]() {
         if (auto ptr = m_parent.lock()) {
             if (m_sameCompositions.count(clipIds.second) == 0) {
                 // Mix was already deleted
                 if (m_mixList.contains(clipIds.first)) {
                     m_mixList.remove(clipIds.first);
                 }
                 return true;
             }
             // Clear asset panel if mix was selected
             if (ptr->m_selectedMix == clipIds.second) {
                 ptr->requestClearAssetView(clipIds.second);
             }
             Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[clipIds.second]->getAsset());
             std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipIds.second));
             movedClip->setMixDuration(0);
             QModelIndex ix = ptr->makeClipIndexFromID(clipIds.second);
             Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::StartRole, TimelineModel::MixRole, TimelineModel::MixCutRole});
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(transition);
             field->unlock();
             m_sameCompositions.erase(clipIds.second);
             m_mixList.remove(clipIds.first);
         }
         return true;
     };
     // lock MLT playlist so that we don't end up with invalid frames in monitor
     auto operation = requestClipDeletion_lambda(clipIds.second, updateView, finalMove, groupMove, false);
     bool res = operation();
     if (res) {
         Fun replay = [this, clipIds, dest_track, firstClipPos, secondClipDuration, mixPosition, mixDurations, build_mix, secondClipPos, clipHasEndMix,
                       updateView, finalMove, groupMove, rearrange_playlists]() {
             if (auto ptr = m_parent.lock()) {
                 ptr->getClipPtr(clipIds.second)->setSubPlaylistIndex(dest_track, m_id);
             }
             bool result = rearrange_playlists();
             auto op = requestClipInsertion_lambda(clipIds.second, secondClipPos, updateView, finalMove, groupMove);
             result = result && op();
             if (result) {
                 build_mix();
                 std::function<bool(void)> local_undo = []() { return true; };
                 std::function<bool(void)> local_redo = []() { return true; };
                 if (auto ptr = m_parent.lock()) {
                     result = ptr->getClipPtr(clipIds.second)
                                  ->requestResize(secondClipPos + secondClipDuration - mixPosition, false, local_undo, local_redo, true, clipHasEndMix);
                     result = result && ptr->getClipPtr(clipIds.first)
                                            ->requestResize(mixPosition + mixDurations.first + mixDurations.second - firstClipPos, true, local_undo, local_redo,
                                                            true, true);
                     QModelIndex ix = ptr->makeClipIndexFromID(clipIds.second);
                     Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::StartRole, TimelineModel::MixRole, TimelineModel::MixCutRole});
                 }
             }
             return result;
         };
 
         Fun reverse = [this, clipIds, source_track, secondClipDuration, firstClipDuration, destroy_mix, secondClipPos, updateView, finalMove, groupMove,
                        operation, rearrange_playlists_undo]() {
             destroy_mix();
             std::function<bool(void)> local_undo = []() { return true; };
             std::function<bool(void)> local_redo = []() { return true; };
             if (auto ptr = m_parent.lock()) {
                 ptr->getClipPtr(clipIds.second)->requestResize(secondClipDuration, false, local_undo, local_redo, false);
                 ptr->getClipPtr(clipIds.first)->requestResize(firstClipDuration, true, local_undo, local_redo, false);
             }
             bool result = operation();
             if (auto ptr = m_parent.lock()) {
                 ptr->getClipPtr(clipIds.second)->setSubPlaylistIndex(source_track, m_id);
             }
             result = result && rearrange_playlists_undo();
             auto op = requestClipInsertion_lambda(clipIds.second, secondClipPos, updateView, finalMove, groupMove);
             result = result && op();
             return result;
         };
         res = replay();
         if (res) {
             PUSH_LAMBDA(replay, operation);
             UPDATE_UNDO_REDO(operation, reverse, undo, redo);
         } else {
             qDebug() << "=============\nSECOND INSERT FAILED\n\n=================";
             reverse();
         }
     } else {
         qDebug() << "=== CLIP DELETION FAILED";
     }
     return res;
 }
 
 std::pair<MixInfo, MixInfo> TrackModel::getMixInfo(int clipId) const
 {
     std::pair<MixInfo, MixInfo> result;
     MixInfo startMix;
     MixInfo endMix;
     if (m_sameCompositions.count(clipId) > 0) {
         // There is a mix at clip start
         startMix.firstClipId = m_mixList.key(clipId, -1);
         startMix.secondClipId = clipId;
         if (auto ptr = m_parent.lock()) {
             if (ptr->isClip(startMix.firstClipId)) {
                 std::shared_ptr<ClipModel> clip1 = ptr->getClipPtr(startMix.firstClipId);
                 std::shared_ptr<ClipModel> clip2 = ptr->getClipPtr(startMix.secondClipId);
                 startMix.firstClipInOut.first = clip1->getPosition();
                 startMix.firstClipInOut.second = startMix.firstClipInOut.first + clip1->getPlaytime();
                 startMix.secondClipInOut.first = clip2->getPosition();
                 startMix.secondClipInOut.second = startMix.secondClipInOut.first + clip2->getPlaytime();
                 startMix.mixOffset = clip2->getMixCutPosition();
             } else {
                 // Clip was deleted
                 startMix.firstClipId = -1;
             }
         }
     } else {
         startMix.firstClipId = -1;
         startMix.secondClipId = -1;
     }
     int secondClip = m_mixList.value(clipId, -1);
     if (secondClip > -1) {
         // There is a mix at clip end
         endMix.firstClipId = clipId;
         endMix.secondClipId = secondClip;
         if (auto ptr = m_parent.lock()) {
             if (ptr->isClip(secondClip)) {
                 std::shared_ptr<ClipModel> clip1 = ptr->getClipPtr(endMix.firstClipId);
                 std::shared_ptr<ClipModel> clip2 = ptr->getClipPtr(endMix.secondClipId);
                 endMix.firstClipInOut.first = clip1->getPosition();
                 endMix.firstClipInOut.second = endMix.firstClipInOut.first + clip1->getPlaytime();
                 endMix.secondClipInOut.first = clip2->getPosition();
                 endMix.secondClipInOut.second = endMix.secondClipInOut.first + clip2->getPlaytime();
             } else {
                 // Clip was deleted
                 endMix.firstClipId = -1;
             }
         }
     } else {
         endMix.firstClipId = -1;
         endMix.secondClipId = -1;
     }
     result = {startMix, endMix};
     return result;
 }
 
 bool TrackModel::deleteMix(int clipId, bool final, bool notify)
 {
     Q_ASSERT(m_sameCompositions.count(clipId) > 0);
     if (auto ptr = m_parent.lock()) {
         if (notify) {
             std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipId));
             movedClip->setMixDuration(final ? 0 : 1);
             QModelIndex ix = ptr->makeClipIndexFromID(clipId);
             Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::StartRole, TimelineModel::MixRole, TimelineModel::MixCutRole});
         }
         if (final) {
             Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[clipId]->getAsset());
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(transition);
             field->unlock();
             m_sameCompositions.erase(clipId);
             int firstClip = m_mixList.key(clipId, -1);
             if (firstClip > -1) {
                 m_mixList.remove(firstClip);
             }
         }
         return true;
     }
     return false;
 }
 
 bool TrackModel::createMix(MixInfo info, std::pair<QString, QVector<QPair<QString, QVariant>>> params, std::pair<int, int> tracks, bool finalMove)
 {
     if (m_sameCompositions.count(info.secondClipId) > 0) {
         // Clip already has a mix
         Q_ASSERT(false);
         return false;
     }
     if (auto ptr = m_parent.lock()) {
         // Insert mix transition
         std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(info.secondClipId));
         int in = movedClip->getPosition();
         // int out = in + info.firstClipInOut.second - info.secondClipInOut.first;
         int duration = info.firstClipInOut.second - info.secondClipInOut.first;
         int out = in + duration;
         movedClip->setMixDuration(duration, info.mixOffset);
         std::unique_ptr<Mlt::Transition> t;
         const QString assetId = params.first;
         t = std::make_unique<Mlt::Transition>(pCore->getProjectProfile().get_profile(), assetId.toUtf8().constData());
         t->set_in_and_out(in, out);
         t->set("kdenlive:mixcut", info.mixOffset);
         t->set("kdenlive_id", assetId.toUtf8().constData());
         t->set_tracks(tracks.first, tracks.second);
         m_track->plant_transition(*t.get(), tracks.first, tracks.second);
         QDomElement xml = TransitionsRepository::get()->getXml(assetId);
         QDomNodeList xmlParams = xml.elementsByTagName(QStringLiteral("parameter"));
         for (int i = 0; i < xmlParams.count(); ++i) {
             QDomElement currentParameter = xmlParams.item(i).toElement();
             QString paramName = currentParameter.attribute(QStringLiteral("name"));
             for (const auto &p : qAsConst(params.second)) {
                 if (p.first == paramName) {
                     currentParameter.setAttribute(QStringLiteral("value"), p.second.toString());
                     break;
                 }
             }
         }
         std::shared_ptr<AssetParameterModel> asset(
             new AssetParameterModel(std::move(t), xml, assetId, ObjectId(KdenliveObjectType::TimelineMix, info.secondClipId, ptr->uuid()), QString()));
         m_sameCompositions[info.secondClipId] = asset;
         m_mixList.insert(info.firstClipId, info.secondClipId);
         if (finalMove) {
             QModelIndex ix2 = ptr->makeClipIndexFromID(info.secondClipId);
             Q_EMIT ptr->dataChanged(ix2, ix2, {TimelineModel::MixRole, TimelineModel::MixCutRole});
         }
         return true;
     }
     qDebug() << "== COULD NOT PLANT MIX; TRACK UNAVAILABLE";
     return false;
 }
 
 bool TrackModel::createMix(MixInfo info, bool isAudio)
 {
     if (m_sameCompositions.count(info.secondClipId) > 0) {
         return false;
     }
     if (auto ptr = m_parent.lock()) {
         // Insert mix transition
         std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(info.secondClipId));
         int in = movedClip->getPosition();
         // int out = in + info.firstClipInOut.second - info.secondClipInOut.first;
         int out = in + movedClip->getMixDuration();
         movedClip->setMixDuration(out - in);
         bool reverse = movedClip->getSubPlaylistIndex() == 0;
         QString assetName;
         std::unique_ptr<Mlt::Transition> t;
         if (isAudio) {
             t = std::make_unique<Mlt::Transition>(pCore->getProjectProfile().get_profile(), "mix");
             t->set_in_and_out(in, out);
             t->set("start", -1);
             t->set("accepts_blanks", 1);
             if (reverse) {
                 t->set("reverse", 1);
             }
             m_track->plant_transition(*t.get(), 0, 1);
             assetName = QStringLiteral("mix");
         } else {
             t = std::make_unique<Mlt::Transition>(pCore->getProjectProfile().get_profile(), "luma");
             t->set_in_and_out(in, out);
             t->set("kdenlive_id", "luma");
             if (reverse) {
                 t->set_tracks(1, 0);
                 m_track->plant_transition(*t.get(), 1, 0);
             } else {
                 t->set_tracks(0, 1);
                 m_track->plant_transition(*t.get(), 0, 1);
             }
             /*if (reverse) {
                 t->set("reverse", 1);
             }
             m_track->plant_transition(*t.get(), 0, 1);*/
             assetName = QStringLiteral("luma");
         }
         QDomElement xml = TransitionsRepository::get()->getXml(assetName);
         std::shared_ptr<AssetParameterModel> asset(
             new AssetParameterModel(std::move(t), xml, assetName, ObjectId(KdenliveObjectType::TimelineMix, info.secondClipId, ptr->uuid()), QString()));
         m_sameCompositions[info.secondClipId] = asset;
         m_mixList.insert(info.firstClipId, info.secondClipId);
         return true;
     }
     return false;
 }
 
 bool TrackModel::createMix(std::pair<int, int> clipIds, std::pair<int, int> mixData)
 {
     if (m_sameCompositions.count(clipIds.second) > 0) {
         return false;
     }
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> movedClip(ptr->getClipPtr(clipIds.second));
         movedClip->setMixDuration(mixData.second);
         QModelIndex ix = ptr->makeClipIndexFromID(clipIds.second);
         Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::MixRole, TimelineModel::MixCutRole});
         bool reverse = movedClip->getSubPlaylistIndex() == 0;
         // Insert mix transition
         QString assetName;
         std::unique_ptr<Mlt::Transition> t;
         if (isAudioTrack()) {
             t = std::make_unique<Mlt::Transition>(pCore->getProjectProfile().get_profile(), "mix");
             t->set_in_and_out(mixData.first, mixData.first + mixData.second);
             t->set("start", -1);
             t->set("accepts_blanks", 1);
             if (reverse) {
                 t->set("reverse", 1);
             }
             m_track->plant_transition(*t.get(), 0, 1);
             assetName = QStringLiteral("mix");
         } else {
             t = std::make_unique<Mlt::Transition>(pCore->getProjectProfile().get_profile(), "luma");
             t->set("kdenlive_id", "luma");
             t->set_in_and_out(mixData.first, mixData.first + mixData.second);
             if (reverse) {
                 t->set_tracks(1, 0);
                 m_track->plant_transition(*t.get(), 1, 0);
             } else {
                 t->set_tracks(0, 1);
                 m_track->plant_transition(*t.get(), 0, 1);
             }
             /*if (reverse) {
                 t->set("reverse", 1);
             }
             m_track->plant_transition(*t.get(), 0, 1);*/
             assetName = QStringLiteral("luma");
         }
         QDomElement xml = TransitionsRepository::get()->getXml(assetName);
         std::shared_ptr<AssetParameterModel> asset(
             new AssetParameterModel(std::move(t), xml, assetName, ObjectId(KdenliveObjectType::TimelineMix, clipIds.second, ptr->uuid()), QString()));
         m_sameCompositions[clipIds.second] = asset;
         m_mixList.insert(clipIds.first, clipIds.second);
         return true;
     }
     return false;
 }
 
 void TrackModel::setMixDuration(int cid, int mixDuration, int mixCut)
 {
     m_allClips[cid]->setMixDuration(mixDuration, mixCut);
     m_sameCompositions[cid]->getAsset()->set("kdenlive:mixcut", mixCut);
     int in = m_allClips[cid]->getPosition();
     int out = in + mixDuration;
     Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[cid]->getAsset());
     transition.set_in_and_out(in, out);
     Q_EMIT m_sameCompositions[cid]->dataChanged(QModelIndex(), QModelIndex(), {AssetParameterModel::ParentDurationRole});
 }
 
 int TrackModel::getMixDuration(int cid) const
 {
     Q_ASSERT(m_sameCompositions.count(cid) > 0);
     Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions.at(cid)->getAsset());
     return transition.get_length() - 1;
 }
 
 void TrackModel::removeMix(const MixInfo &info)
 {
     Q_ASSERT(m_sameCompositions.count(info.secondClipId) > 0);
     Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[info.secondClipId]->getAsset());
     QScopedPointer<Mlt::Field> field(m_track->field());
     field->lock();
     field->disconnect_service(transition);
     field->unlock();
     m_sameCompositions.erase(info.secondClipId);
     m_mixList.remove(info.firstClipId);
 }
 
 void TrackModel::syncronizeMixes(bool finalMove)
 {
     QList<int> toDelete;
     for (const auto &n : m_sameCompositions) {
         // qDebug() << "Key:[" << n.first << "] Value:[" << n.second << "]\n";
         int secondClipId = n.first;
         int firstClip = m_mixList.key(secondClipId, -1);
         Q_ASSERT(firstClip > -1);
         if (m_allClips.find(firstClip) == m_allClips.end() || m_allClips.find(secondClipId) == m_allClips.end()) {
             // One of the clip was removed, delete the mix
             qDebug() << "=== CLIPS: " << firstClip << " / " << secondClipId << " ARE MISSING!!!!";
             Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[secondClipId]->getAsset());
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(transition);
             field->unlock();
             toDelete << secondClipId;
             m_mixList.remove(firstClip);
             continue;
         }
         // Asjust mix in/out
         int mixIn = m_allClips[secondClipId]->getPosition();
         int mixOut = m_allClips[firstClip]->getPosition() + m_allClips[firstClip]->getPlaytime();
         if (mixOut <= mixIn) {
             if (finalMove) {
                 // Delete mix
                 mixOut = mixIn;
             } else {
                 mixOut = mixIn + 1;
             }
         }
         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[secondClipId]->getAsset());
         if (mixIn == mixOut) {
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(transition);
             field->unlock();
             toDelete << secondClipId;
             m_mixList.remove(firstClip);
         } else {
             transition.set_in_and_out(mixIn, mixOut);
         }
         if (auto ptr = m_parent.lock()) {
             ptr->getClipPtr(secondClipId)->setMixDuration(mixOut - mixIn);
             QModelIndex ix = ptr->makeClipIndexFromID(secondClipId);
             Q_EMIT ptr->dataChanged(ix, ix, {TimelineModel::MixRole, TimelineModel::MixCutRole});
         }
     }
     for (int i : qAsConst(toDelete)) {
         m_sameCompositions.erase(i);
     }
 }
 
 int TrackModel::mixCount() const
 {
     Q_ASSERT(m_mixList.size() == int(m_sameCompositions.size()));
     return m_mixList.size();
 }
 
 bool TrackModel::hasMix(int cid) const
 {
     if (m_mixList.contains(cid)) {
         return true;
     }
     if (m_sameCompositions.count(cid) > 0) {
         return true;
     }
     return false;
 }
 
 bool TrackModel::hasStartMix(int cid) const
 {
     return m_sameCompositions.count(cid) > 0;
 }
 
 int TrackModel::isOnCut(int cid)
 {
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<CompositionModel> composition = ptr->getCompositionPtr(cid);
         // Start and end pos are incremented by 1 to account snapping
         int startPos = composition->getPosition() - 1;
         int endPos = startPos + composition->getPlaytime() + 1;
         int cid1 = getClipByPosition(startPos);
         int cid2 = getClipByPosition(endPos);
         if (cid1 == -1 || cid2 == -1 || cid1 == cid2) {
             return -1;
         }
         if (m_mixList.contains(cid1) || m_sameCompositions.count(cid2) > 0) {
             // Clips are already mixed, abort
             return -1;
         }
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(cid2);
         int mixRight = clip->getPosition();
         std::shared_ptr<ClipModel> clip2 = ptr->getClipPtr(cid1);
         int mixLeft = clip2->getPosition() + clip2->getPlaytime();
         if (mixLeft == mixRight) {
             return mixLeft;
         }
     }
     return -1;
 }
 
 bool TrackModel::hasEndMix(int cid) const
 {
     return m_mixList.contains(cid);
 }
 
 int TrackModel::getSecondMixPartner(int cid) const
 {
     return hasEndMix(cid) ? m_mixList.find(cid).value() : -1;
 }
 
 QDomElement TrackModel::mixXml(QDomDocument &document, int cid) const
 {
     QDomElement container = document.createElement(QStringLiteral("mix"));
     int firstClipId = m_mixList.key(cid);
     container.setAttribute(QStringLiteral("firstClip"), firstClipId);
     container.setAttribute(QStringLiteral("secondClip"), cid);
     if (auto ptr = m_parent.lock()) {
         std::shared_ptr<ClipModel> clip = ptr->getClipPtr(firstClipId);
         container.setAttribute(QStringLiteral("firstClipPosition"), clip->getPosition());
     }
     const QString assetId = m_sameCompositions.at(cid)->getAssetId();
     QVector<QPair<QString, QVariant>> params = m_sameCompositions.at(cid)->getAllParameters();
     container.setAttribute(QStringLiteral("asset"), assetId);
     for (const auto &p : qAsConst(params)) {
         QDomElement para = document.createElement(QStringLiteral("param"));
         para.setAttribute(QStringLiteral("name"), p.first);
         QDomText val = document.createTextNode(p.second.toString());
         para.appendChild(val);
         container.appendChild(para);
     }
     std::pair<int, int> tracks = getMixTracks(cid);
     container.setAttribute(QStringLiteral("a_track"), tracks.first);
     container.setAttribute(QStringLiteral("b_track"), tracks.second);
 
     std::pair<MixInfo, MixInfo> mixData = getMixInfo(cid);
     container.setAttribute(QStringLiteral("mixStart"), mixData.first.secondClipInOut.first);
     container.setAttribute(QStringLiteral("mixEnd"), mixData.first.firstClipInOut.second);
     container.setAttribute(QStringLiteral("mixOffset"), mixData.first.mixOffset);
     return container;
 }
 
 bool TrackModel::loadMix(Mlt::Transition *t)
 {
     int in = t->get_in();
     int out = t->get_out() - 1;
     bool reverse = t->get_int("reverse") == 1;
     int cid1 = getClipByPosition(in, reverse ? 1 : 0);
     int cid2 = getClipByPosition(out, reverse ? 0 : 1);
     if (cid1 < 0 || cid2 < 0) {
         qDebug() << "INVALID CLIP MIX: " << cid1 << " - " << cid2;
         // Check if reverse setting was not correctly set
         cid1 = getClipByPosition(in, reverse ? 0 : 1);
         cid2 = getClipByPosition(out, reverse ? 1 : 0);
         if (cid1 < 0 || cid2 < 0) {
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(*t);
             field->unlock();
             return false;
         }
     } else {
         int firstClipIn = m_allClips[cid1]->getPosition();
         if (in == firstClipIn && in != m_allClips[cid2]->getPosition()) {
             qDebug() << "/// SWAPPING CLIPS";
             if (m_allClips[cid1]->getPosition() > m_allClips[cid2]->getPosition()) {
                 // Incorrecty detected revert mix
                 std::swap(cid1, cid2);
             }
         }
         if (m_allClips[cid1]->getPosition() > m_allClips[cid2]->getPosition() ||
             (m_allClips[cid1]->getPosition() + m_allClips[cid1]->getPlaytime()) > (m_allClips[cid2]->getPosition() + m_allClips[cid2]->getPlaytime())) {
             // Impossible mix, remove
             QScopedPointer<Mlt::Field> field(m_track->field());
             field->lock();
             field->disconnect_service(*t);
             field->unlock();
             return false;
         }
     }
     // Ensure in/out points are in sync with the clips
     int clipIn = m_allClips[cid2]->getPosition();
     int clipOut = m_allClips[cid1]->getPosition() + m_allClips[cid1]->getPlaytime();
     if (in != clipIn || out != clipOut) {
         t->set_in_and_out(clipIn, clipOut);
     }
     QString assetId(t->get("kdenlive_id"));
     if (assetId.isEmpty()) {
         assetId = QString(t->get("mlt_service"));
     }
     std::unique_ptr<Mlt::Transition> tr(t);
     QDomElement xml = TransitionsRepository::get()->getXml(assetId);
     // Paste parameters from existing mix
     // std::unique_ptr<Mlt::Properties> sourceProperties(t);
     QStringList sourceProps;
     for (int i = 0; i < tr->count(); i++) {
         sourceProps << tr->get_name(i);
     }
     QDomNodeList params = xml.elementsByTagName(QStringLiteral("parameter"));
     for (int i = 0; i < params.count(); ++i) {
         QDomElement currentParameter = params.item(i).toElement();
         QString paramName = currentParameter.attribute(QStringLiteral("name"));
         if (!sourceProps.contains(paramName)) {
             continue;
         }
         QString paramValue = tr->get(paramName.toUtf8().constData());
         currentParameter.setAttribute(QStringLiteral("value"), paramValue);
     }
     QUuid timelineUuid;
     if (auto ptr = m_parent.lock()) {
         timelineUuid = ptr->uuid();
     }
     std::shared_ptr<AssetParameterModel> asset(
         new AssetParameterModel(std::move(tr), xml, assetId, ObjectId(KdenliveObjectType::TimelineMix, cid2, timelineUuid), QString()));
     m_sameCompositions[cid2] = asset;
     m_mixList.insert(cid1, cid2);
     int mixDuration = t->get_length() - 1;
     int mixCutPos = qMin(t->get_int("kdenlive:mixcut"), mixDuration);
     setMixDuration(cid2, mixDuration, mixCutPos);
     return true;
 }
 
 const std::shared_ptr<AssetParameterModel> TrackModel::mixModel(int cid)
 {
     if (m_sameCompositions.count(cid) > 0) {
         return m_sameCompositions[cid];
     }
     return nullptr;
 }
 
 bool TrackModel::reAssignEndMix(int currentId, int newId)
 {
     Q_ASSERT(m_mixList.contains(currentId));
     int mixedClip = m_mixList.value(currentId);
     m_mixList.remove(currentId);
     m_mixList.insert(newId, mixedClip);
     return true;
 }
 
 std::pair<int, int> TrackModel::getMixTracks(int cid) const
 {
     Q_ASSERT(m_sameCompositions.count(cid) > 0);
     int a_track = m_sameCompositions.at(cid)->getAsset()->get_int("a_track");
     int b_track = m_sameCompositions.at(cid)->getAsset()->get_int("b_track");
     return {a_track, b_track};
 }
 
 std::pair<QString, QVector<QPair<QString, QVariant>>> TrackModel::getMixParams(int cid)
 {
     Q_ASSERT(m_sameCompositions.count(cid) > 0);
     const QString assetId = m_sameCompositions[cid]->getAssetId();
     QVector<QPair<QString, QVariant>> params = m_sameCompositions[cid]->getAllParameters();
     return {assetId, params};
 }
 
 void TrackModel::switchMix(int cid, const QString &composition, Fun &undo, Fun &redo)
 {
     // First remove existing mix
     // lock MLT playlist so that we don't end up with invalid frames in monitor
     const QString currentAsset = m_sameCompositions[cid]->getAssetId();
     QVector<QPair<QString, QVariant>> allParams = m_sameCompositions[cid]->getAllParameters();
     std::pair<int, int> originTracks = getMixTracks(cid);
     // Check if mix should be reversed
     bool reverse = m_allClips[cid]->getSubPlaylistIndex() == 0;
     Fun local_redo = [this, cid, composition, reverse]() {
         m_playlists[0].lock();
         m_playlists[1].lock();
         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[cid]->getAsset());
         int in = transition.get_in();
         int out = transition.get_out();
         int mixCutPos = transition.get_int("kdenlive:mixcut");
         QScopedPointer<Mlt::Field> field(m_track->field());
         field->lock();
         field->disconnect_service(transition);
         field->unlock();
         m_sameCompositions.erase(cid);
         if (auto ptr = m_parent.lock()) {
             std::unique_ptr<Mlt::Transition> t = TransitionsRepository::get()->getTransition(composition);
             t->set_in_and_out(in, out);
             if (reverse) {
                 t->set_tracks(1, 0);
                 m_track->plant_transition(*t.get(), 1, 0);
             } else {
                 t->set_tracks(0, 1);
                 m_track->plant_transition(*t.get(), 0, 1);
             }
             t->set("kdenlive:mixcut", mixCutPos);
             QDomElement xml = TransitionsRepository::get()->getXml(composition);
             std::shared_ptr<AssetParameterModel> asset(
                 new AssetParameterModel(std::move(t), xml, composition, ObjectId(KdenliveObjectType::TimelineMix, cid, ptr->uuid()), QString()));
             m_sameCompositions[cid] = asset;
         }
         m_playlists[0].unlock();
         m_playlists[1].unlock();
         return true;
     };
     Fun local_undo = [this, cid, currentAsset, allParams, originTracks]() {
         m_playlists[0].lock();
         m_playlists[1].lock();
         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions[cid]->getAsset());
         int in = transition.get_in();
         int out = transition.get_out();
         QScopedPointer<Mlt::Field> field(m_track->field());
         field->lock();
         field->disconnect_service(transition);
         field->unlock();
         m_sameCompositions.erase(cid);
         if (auto ptr = m_parent.lock()) {
             std::unique_ptr<Mlt::Transition> t = TransitionsRepository::get()->getTransition(currentAsset);
             t->set_in_and_out(in, out);
             t->set_tracks(originTracks.first, originTracks.second);
             m_track->plant_transition(*t.get(), originTracks.first, originTracks.second);
             QDomElement xml = TransitionsRepository::get()->getXml(currentAsset);
             QDomNodeList xmlParams = xml.elementsByTagName(QStringLiteral("parameter"));
             for (int i = 0; i < xmlParams.count(); ++i) {
                 QDomElement currentParameter = xmlParams.item(i).toElement();
                 QString paramName = currentParameter.attribute(QStringLiteral("name"));
                 for (const auto &p : qAsConst(allParams)) {
                     if (p.first == paramName) {
                         currentParameter.setAttribute(QStringLiteral("value"), p.second.toString());
                         break;
                     }
                 }
             }
             std::shared_ptr<AssetParameterModel> asset(
                 new AssetParameterModel(std::move(t), xml, currentAsset, ObjectId(KdenliveObjectType::TimelineMix, cid, ptr->uuid()), QString()));
             m_sameCompositions[cid] = asset;
         }
         m_playlists[0].unlock();
         m_playlists[1].unlock();
         return true;
     };
     UPDATE_UNDO_REDO(local_redo, local_undo, undo, redo);
 }
 
 void TrackModel::reverseCompositionXml(const QString &composition, QDomElement xml)
 {
     if (composition == QLatin1String("luma") || composition == QLatin1String("dissolve") || composition == QLatin1String("mix")) {
         Xml::setXmlParameter(xml, QStringLiteral("reverse"), QStringLiteral("1"));
     } else if (composition == QLatin1String("composite")) {
         Xml::setXmlParameter(xml, QStringLiteral("invert"), QStringLiteral("1"));
     } else if (composition == QLatin1String("wipe")) {
         Xml::setXmlParameter(xml, QStringLiteral("geometry"), QStringLiteral("0=0% 0% 100% 100% 100%;-1=0% 0% 100% 100% 0%"));
     } else if (composition == QLatin1String("slide")) {
         Xml::setXmlParameter(xml, QStringLiteral("rect"), QStringLiteral("0=0% 0% 100% 100% 100%;-1=100% 0% 100% 100% 100%"));
     }
 }
 
 void TrackModel::updateCompositionDirection(Mlt::Transition &transition, bool reverse)
 {
     if (reverse) {
         transition.set_tracks(1, 0);
         m_track->plant_transition(transition, 1, 0);
     } else {
         transition.set_tracks(0, 1);
         m_track->plant_transition(transition, 0, 1);
     }
 }
 
 bool TrackModel::mixIsReversed(int cid) const
 {
     if (m_sameCompositions.count(cid) > 0) {
         // There is a mix at clip start, adjust direction
         Mlt::Transition &transition = *static_cast<Mlt::Transition *>(m_sameCompositions.at(cid)->getAsset());
         if (isAudioTrack()) {
             qDebug() << "::: CHKING TRANSITION ON AUDIO TRACK: " << transition.get_int("reverse");
             return transition.get_int("reverse") == 1;
         }
         qDebug() << "::: CHKING TRANSITION ON video TRACK: ";
         return (transition.get_a_track() == 1 && transition.get_b_track() == 0);
     }
     return false;
 }
 
 QVariantList TrackModel::stackZones() const
 {
     return m_effectStack->getEffectZones();
 }
 
 bool TrackModel::hasClipStart(int pos)
 {
     for (auto &m_playlist : m_playlists) {
         if (m_playlist.is_blank_at(pos)) {
             continue;
         }
         if (pos == 0 || m_playlist.get_clip_index_at(pos) != m_playlist.get_clip_index_at(pos - 1)) {
             return true;
         }
     }
     return false;
 }
 
 QByteArray TrackModel::trackHash()
 {
     QByteArray fileData;
     // Parse clips
     for (auto &clip : m_allClips) {
         fileData.append(clip.second->clipHash().toUtf8());
     }
     // Parse mixes
     for (auto &sameComposition : m_sameCompositions) {
         Mlt::Transition *tr = static_cast<Mlt::Transition *>(sameComposition.second->getAsset());
         QString mixData = QString("%1 %2 %3").arg(QString::number(tr->get_in()), QString::number(tr->get_out()), sameComposition.second->getAssetId());
         fileData.append(mixData.toLatin1());
     }
     return fileData;
 }