[MPlayer-users] Two-passes encoding - What happens exactly?

[Alain Barthélemy]

Le mardi 01 juin 2004, 16:11:22 ou environ Nico Sabbi <nsabbi at tiscali.it> a écrit:
> Alain Barthélemy wrote:
> 
> >Le lundi 31 mai 2004, 16:11:22 ou environ The Wanderer 
> ><inverseparadox at comcast.net> a écrit:
> > 
> >
> >>Alain Barthélemy wrote:
> >>
> >>   
> >>
> >>>Let's have an example. I do a lot of encoding of TV signal. TV signal
> >>>is never of optimum quality of course. Here is my instruction line:
> >>>
> >>>mencoder -tv driver=v4l:width=640:height=480:amode=0 -ovc lavc 
> >>>-lavcopts vcodec=mpeg4:vbitrate=1800:mbd=2:acodec=mp3:v4mv -oac 
> >>>mp3lame -lameopts cbr:br=96:mode=3 -vf crop=620:460,pp=tn/lb,scale 
> >>>-zoom -xy 640 -sws 1 tv:// -o movie.avi -endpos <sec>
> >>>
> >>>I am not original. I just try what I read on the list.
> >>>     
> >>>
> >>Any particular reason you don't use -oac lavc -lavcopts
> >>acodec=mp3:abitrate=96:... ? Do you just really need mono sound?
> >>
> >>-- 
> >>     The Wanderer
> >>   
> >>
> >
> >What does abitrate=96 do here? If I read the manpage, I see: 
> >
> >abitrate = <value>
> >   Audio bitrate in kBit (default 224)
> >
> >What does it do with mono/stereo sound and there is always a default value 
> >(224).
> >
> >Why 224 as default? Why not 128 as default?
> >
> > 
> >
> 
> because the default codec is mp2 (which compresses much less and worse), 
> not mp3

Now one answer leads to another question. I was talking about default abitrate
and you talk about default codec. What is the task of -oac mp3lame -lameopts
...? I thought lame encoded with mp3 as audio codec (at least in my setting).


-- 
Alain Barthélemy
cassandre at bartydeux.be
http://bartydeux.be
Linux User #315631