Interlace Detect

It can be difficult to differentiate Interlaced video vs Telecined video. 

Here's a decent method

http://www.aktau.be/2013/09/22/detecting-interlaced-video-with-ffmpeg/

ffmpeg -filter:v idet \
-frames:v 100 \
-an \
-f rawvideo -y /dev/null \
-i 

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