[MPlayer-users] vbitrate estimation using 3 pass encoding (divx)

[Arpi]

Hi,

> (3 pass audio/video/video)
> mencoder -oac mp3lame -lameopts vbr=3 -ovc frameno -o frameno.avi -dvd 1
> mencoder -oac copy -ovc lavc -lavcopts 
> vcodec=mpeg4:vhq:vbitrate=$vbitrate:vpass1 -dvd 1
> mencoder -oac copy -ovc lavc -lavcopts 
> vcodec=mpeg4:vhq:vbitrate=$vbitrate:vpass2 -dvd 1

isn't it vpass=1 and vpass=2 ?

> in fact, both produce files of the same size, so why even bother with the 3rd 
> pass?  btw, $vbitrate is coming from the output of the first (audio) pass.
size doesn't matter, in ideal case size won't change. quality may do.

> ok, now here is my real question.  suppose i do a first (audio) pass and it 
> tells me i should use a vbitrate of 635.  ok thats all fine and good, but if 
> i ended up cropping scaling, or reducing the fps in the other passes, that 
> vbitrate of 635 can now be raised...right?  if so, by how much?  how do i 
no! that value comes from the length (in time) of your movie and the free
space left after saving audio on your CD.
quality may will be raised by scaling etc, see docs.


A'rpi / Astral & ESP-team

--
Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu