(asset->video_length = ff->ff_video_frames(0)) < 2 )
asset->video_length = asset->video_length < 0 ? 0 : -1;
if( !asset->frame_rate ) asset->frame_rate = ff->ff_frame_rate(0);
(asset->video_length = ff->ff_video_frames(0)) < 2 )
asset->video_length = asset->video_length < 0 ? 0 : -1;
if( !asset->frame_rate ) asset->frame_rate = ff->ff_frame_rate(0);