int mltInsertClip(ItemInfo info, QDomElement element, Mlt::Producer *prod, bool overwrite = false, bool push = false);
bool mltUpdateClip(ItemInfo info, QDomElement element, Mlt::Producer *prod);
void mltCutClip(int track, GenTime position);
int mltInsertClip(ItemInfo info, QDomElement element, Mlt::Producer *prod, bool overwrite = false, bool push = false);
bool mltUpdateClip(ItemInfo info, QDomElement element, Mlt::Producer *prod);
void mltCutClip(int track, GenTime position);