[MPlayer-users] 3 pass encoding: scaling and bitrate

[Marcos Dione]

  I'm experimenting w/ encoding dvd to divx. I use 3 pass encoding. the first
one grabs the audio and gives me the suggested bitrate for the different cd
sizes. then the 2nd and 3rd ones use this bitrate to really encode. but in this
encoding I also scale the movie down, keeping aspect. my question is if the
suggested bitrate is still valid, even if I scale down the movie. the lines I
use are (lines split intentionally):

1st pass:
  mencoder
    dvd://1
    -ovc frameno
    -oac mp3lame
    -o frameno.avi
    -dvd-device /path/to/vobs
    
2nd and 3rd pass:
  mencoder
    dvd://1
    -ovc lavc
    -lavcopts vcodec=mpeg4:
      vlelim=-4:
      vcelim=9:
      lumi_mask=0.05:
      dark_mask=0.01:
      v4mv:
      mbd=2:
      vbitrate=<bitrate suggested>:
      vpass=<1 or 2>
    -vf pp=lb,
      scale=640:<scaled value according to aspect ratio>
    -oac copy
    -o "movie.avi"
    -dvd-device /path/to/vobs
    
  or should I also specify scaling in the 1st pass? I know calcbpp.pl exists,
but I plan to introduce it gradually as I refine the script.

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