if (!asset->interlace_mode) asset->interlace_mode = ff->ff_interlace(0);
if ( ff->ff_video_frames(0) > 1 ) {
ff->video_probe(1);
if (!asset->interlace_mode) asset->interlace_mode = ff->ff_interlace(0);
if ( ff->ff_video_frames(0) > 1 ) {
ff->video_probe(1);