[MPlayer-users] variable bitrate for the video?
Fabio Papa (MCE)
f.papa at mcmspa.it
Wed Apr 23 13:55:19 CEST 2003
On Wed, 23 Apr 2003 13:33:46 +0200
"Wendy Tromp" <wendy at snuffel.net> wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > Hm? Bitrate should be variable by default with most of the codecs. What
> > codec are you trying? Normally you have to specify parameters to make the
> > bitrate constant.
>
> I realise now that 2-pass encoding is for variable bitrates, but I don't
> quite get how that works. I know that the first pass is for getting
> information about the movie and that in the second pass this information is
> used. I am now doing the following commands:
>
> mencoder -ovc lavc -lavcopts
> vcodec=mpeg4:vhq:vpass=1:vbitrate=1200:v4mv -passlogfile=/mnt/log.log -oac
> mp3lame -lameopts br=192 movie.avi -o movie_encoded.avi
>
> and
>
> mencoder -ovc lavc -lavcopts
> vcodec=mpeg4:vhq:vpass=1:vbitrate=1200:v4mv -passlogfile=/mnt/log.log -oac
> mp3lame -lameopts br=192 movie.avi -o movie_encoded.avi
>
> Now this results in a movie of about 10 megs per minute, and decent quality,
> but I actually have no idea what I am doing. I am very curious about the
> vbitrate part, what it does, and when it is useful to specify it. Does it
> indicate the minumum bitrate or the maximum or what?
I suggest you to read encoding-tips.txt, which is in the DOCS/tech subdir of
the MPlayer source.
And anyway, variable bitrate is not only in 2pass encoding; 1 pass encoding is
variable as well, only not that much optimized for quality.
>
> can anyone help me with this?
> Wendy
I hope I just did!
>
> _______________________________________________
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--
Fabio Papa - italian LTSP translator
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