[MEncoder-users] Weird audio codec problem.

Lee lee at pyrabot.com
Tue Aug 1 21:10:45 CEST 2006

It took me awhile to figure out what was going on but I have an instance

where MEncoder is ignoring a first pass through lame and is outputting 
AC3, meaning that AC3 codecs need to be installed on playback.

First pass command:
mencoder -ovc frameno -o frameno.avi -oac mp3lame -lameopts cbr:br=128 

Second pass command
mencoder -oac copy -ovc lavc -lavcopts 
vcodec=mpeg4:vhq:vbitrate=1049:vpass=1 -ffourcc XVID -vf 
crop=720:464:0:6 test.vob -o /dev/null

At this point MEncoder spits out the following

AUDIO: 48000 Hz, 2 ch, s16le, 192.0 kbit/12.50% (ratio: 24000->192000)
Selected audio codec: [a52] afm: liba52 (AC3-liba52)

Continuing on to the 3rd pass with the same audio output message above.....
mencoder -oac copy -ovc lavc -lavcopts 
vcodec=mpeg4:vhq:vbitrate=1049:vpass=2 -ffourcc XVID -vf 
crop=720:464:0:6 test.vob -o test.avi

Sure enough the AVI has AC3 encoded audio. Why the total disregard of 
the first pass and MP3 encoding at 128kb?

Installed versions:


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