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.
ffmpeg detect interlaced video
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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.