[MEncoder-users] Vorbis Sounds BAD.

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I tried to encode some stuff the other day using Vorbis, but found the
results to sound pretty bad for the bitrate. With FFmpeg, I find 60Kb/s more
than enough to produce music that sounds like almost CD quality to me, but
with mencoder, using -audiofile file.wav -oac lavc -lavcopts
acodec=vorbis:abitrate=60   the resulting sound - well, we all know what
happens when the bitrate is too low. Do I need to give lavc some more
options for high quality or something? I did notice that it encodes very
quickly, which makes me suspicious of the quality of the encode.

THanks for any help.