[MEncoder-users] Two audio-related problems with mencoder (dev-SVN-r23550-3.3.4)

[Joey Parrish]

On 6/13/07, Federico Zema <Federico.Zema at cern.ch> wrote:
> > > mencoder demo_maestri.mpg -ovc lavc -oac lavc -lavcopts
> > > autoaspect:vcodec=mpeg4: acodec=mp2:vpass=1 -o demo_maestri.avi
> > > -frames 1000 -v
> >
> > If you use -oac mp3lame, this will not happen.  -oac lavc is broken. I'd
> > love it if somebody could fix it.  I reported this ages ago and nothing
> > has happened yet.
>
> Hi,
>  indeed it does not happen with mp3lame, thanks a lot!
>
> I suppose both mp3lame and lavc with acodec=mp3 use lame, don't they? Thus
> there should be no noticeable difference in the output regarding quality
> (provided similar encoding option are specified); what about portability?
>
> Btw, I did a few more tests with "-oac lavc", and I always got the same
> problem, independently of which audio codec I chose, but not for mpg
> files! This command works fine:
>
> mencoder demo_maestri-orig.mpg -o demo_maestri.mpg \
>     -of mpeg -mpegopts format=mpeg1:tsaf \
>     -ovc lavc -oac lavc -lavcopts autoaspect:vcodec=mpeg1video:acodec=mp2

Interesting.  That might point to a problem not with oac lavc, but
with the avi muxer.  I will do some testing and try to make another
bug report.  Perhaps this time I'll get the attention of someone who
can fix it.  Wish me luck.

--Joey