Use the ident filter eg:
ffmpeg -filter:v idet -frames:v 200 -an -f rawvideo -y /dev/null -i video.mkv
and look for TFF or BFF frames.
Use the ident filter eg:
ffmpeg -filter:v idet -frames:v 200 -an -f rawvideo -y /dev/null -i video.mkv
and look for TFF or BFF frames.