[FFmpeg-devel] [PATCH] MJPEG encoder to write aspect ratio information

Niobos niobos at dest-unreach.be
Wed Apr 20 14:10:32 CEST 2011

I'm trying to use ffmpeg to extract frames from a live TV signal. The TV
signal can have both 4:3 or 16:9 aspect ratio, and can even switch
during the day.

I was trying to figure out how the current aspect ratio is encoded in
the JPG I asked ffmpeg to output, but found out that it's not.

The attached patch solves that issue for me. I'm sure I broke a dozen
coding rules in there, but wanted to share my findings anyway...

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