start_time, end_time, end_time-start_time, clip_start, clip_end,
video.frame_count(clip_start), video.frame_count(clip_end));
return 0;
start_time, end_time, end_time-start_time, clip_start, clip_end,
video.frame_count(clip_start), video.frame_count(clip_end));
return 0;