bool mltResizeClipStart(ItemInfo info, GenTime diff);
bool mltResizeClipCrop(ItemInfo info, GenTime newCropStart);
bool mltMoveClip(int startTrack, int endTrack, GenTime pos, GenTime moveStart, Mlt::Producer *prod, bool overwrite = false, bool insert = false);
bool mltResizeClipStart(ItemInfo info, GenTime diff);
bool mltResizeClipCrop(ItemInfo info, GenTime newCropStart);
bool mltMoveClip(int startTrack, int endTrack, GenTime pos, GenTime moveStart, Mlt::Producer *prod, bool overwrite = false, bool insert = false);