previous_frame? mlt_frame_original_position(previous_frame) : -1,
mlt_frame_original_position(frame),
next_frame? mlt_frame_original_position(next_frame) : -1);
previous_frame? mlt_frame_original_position(previous_frame) : -1,
mlt_frame_original_position(frame),
next_frame? mlt_frame_original_position(next_frame) : -1);