[MPlayer-users] Re: mencoder with lavc, mpeg4, vbitrate=1250 producing 3GB/h files

[Brian J. Murrell]

On Sun, Aug 11, 2002 at 03:48:02AM +0200, Rémi Guyomarch wrote:
>
> > $ mencoder -pass 1 -ovc lavc \
>              ^^^^^^^            
>             not useful       

Indeed.  But should not _cause_ lavc to create files way bigger than
the prescribed bitrate.

> > -lavcopts vcoded=mpeg4:vbitrate=1250:vme=5:vqmin=2:vratetol=40000 -o file.avi file.mpeg
>             ^^^^^^                     ^^^^^
>             typo ?                 are you sure ?

Yes, typo.  Was actually vcodec.  I didn't have cut'n'paste.  As for
the vme, that is just what an example on the list used.  I removed the
vme option (use default) now.  I have also tried adding vpass=1 (which
should be default as well) and I am still getting a 2GB/h encoding.


> Btw, 1250 Kbits/s will give you :
> 1250/8*1000*3600/1024/1024 ~= 536.4 MBytes / hour
> With vratetol=40000 and 128KBits/s mp3 audio, it should give you
> between 586 MBytes/h and 596 MBytes/h. Add to that the .avi overhead.
> 
> 830 MBytes/h is already too much.

Indeed.  But not as much as 2-3GB/h.

> Are you sure you have the latest (CVS) mplayer/mencoder *and*
> libavcodec ?

Good catch.  I didn't.  For some reason the libavcoded in my mplayer
directory failed to cvs update.  I just did it now, and did a make
there as well as in .. to rebuild mplayer and mencoder.  No change.  I
am still getting a 2GB/h file with the options:

-ovc lavc -lavcopts vcodec=mpeg4:vpass=1:vbitrate=1250:vhq:vqmin=2:vratetol=40000 -oac copy

Maybe it's time to post some output of mencoder with a "-v" or two.

Thanx for the insightful help though.  Much appreciated.

b.

-- 
Brian J. Murrell
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