[Libav-user] recording with uncompressed audio speeds up video

Mike Versteeg mike at mikeversteeg.com
Fri Jan 18 13:55:41 CET 2013

I  have been using a recorder (based on muxer example) satisfactorily
for quite some time for various formats. Now I need to use
uncompressed audio to go with MJPEG video and I notice video speeds up
considerable (like 10 times as fast) in the recorded file. Audio is
OK, and if I use a compressed audio format (like mp3) video is fine as
always. Does anyone have an idea why video speeds up the moment I use
uncompresseed audio (CODEC_ID_PCM_S16LE)?

Mike Versteeg

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