[FFmpeg-devel] [PATCH] Psygnosis YOP demuxer

Thomas Higdon thomas.p.higdon
Sun Aug 9 01:10:17 CEST 2009

This patch adds a demuxer for the Psygnosis YOP video format. The spec
I followed is here:


This patch does not include the video decoder, which is finished, but
will be submitted separately. After this patch is applied, audio
should work, because the audio decoder used is the Westwood IMA ADPCM
decoder, which worked for the YOP audio without modifications. Test
files are at:


I'm sure there are some things I've done that are awkward, due to my
lack of familiarity with the API.

Also, I believe there still may be problems with this demuxer. When
the stream ends, the video freezes, and A-V sync continues into the
negative indefinitely. Any ideas on what might be causing this?
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