[Ffmpeg-devel] Patches for Quiktime Component video and Quiktime Black Magic 10 bits codecs.

Thomas Parmegiani thomasp
Thu Oct 12 16:22:21 CEST 2006

I am looking for a patch for these 2 codecs...

Thanks in advance !

Best Regards,

  -----Message d'origine-----
  De : Thomas Parmegiani [mailto:thomasp at doremilabs.fr]
  Envoy? : jeudi 12 octobre 2006 14:52
  ? : Ffmpeg Dev Mailing List
  Objet : Ratecontrol problem

  Hi all !

  I have some problems to reencode a MPEG2 file (IBP, 1920x1080, 30 Mbs) to
a 15 Mbs I only

  file (I only is important as I need it).

  At the moment my main problem is not the quality but the target bitrate. I
get too many rc buffer underflow warnings ! Can anyone help me about my
problem ?

  Here is the command line I use : ./ffmpeg -i /e/test.ts -b
15000000 -minrate 15000000 -maxrate 15000000 -bt 1 -bufsize 1500000 -intra

  Changing bufsize value does not change anything. If target bitrate is
bigger than source bitrate It works but not if I want a lower bitrate.

  Please note I have the same problem if I work with a lower bitrate files.
I have uploaded a small low bitrated file (8 Mbs) for testing :

  ./ffmpeg -i /e/Film V44.mpg -b 3000000 -minrate 3000000 -maxrate
3000000 -bt 1 -bufsize 300000 -intra /e/test2.ts

  I tried to have a 3Mbs without any success. Please help !



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