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[Sebastian Ramacher <1308607@xxxxxxxxxxxxxxxxxx>]

Please test if this is still an issue with more recent versions of libav
(libav 11).

** Changed in: libav (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1308607

Title:
  avconv uses only 1 core Ubuntu 13.10

Status in libav package in Ubuntu:
  Incomplete

Bug description:
  I tried to get a movie transcoded with libx264 and libvorbis instead
  of AC3-DTS but avconv is not using all 4 cores of my computer. The
  original file has the video track plus three audio tracks, one in DTS-
  HD MA, one in DTS and the last one in AC3.

  My command line is this:

  avconv -i MOVIE.mkv -map 0:0 -codec:v libx264 -pass 1 -threads 6
  -coder:v ac -g 240 -keyint_min 23 -bf:v 16 -b_strategy 2 -b-bias 0
  -refs 3 -b:v 11000k -partitions p8x8,b8x8,i8x8,i4x4 -mixed-refs 1
  -me_range:v 20 -me_method:v umh -subq 8 -b-pyramid strict -8x8dct 1
  -direct-pred 1 -weightb 1 -weightp 2 -deblock 0:0 -an -f rawvideo -y
  /dev/null ;

  avconv -i MOVIE.mkv -map 0 -map -0:2 -map -0:3 -codec:s copy -codec:v
  libx264 -pass 2 -threads 6 -coder:v ac -g 240 -keyint_min 23 -bf:v 16
  -b_strategy 2 -b-bias 0 -refs 3 -b:v 11000k -partitions
  p8x8,b8x8,i8x8,i4x4 -mixed-refs 1 -me_range:v 20 -me_method:v umh
  -subq 8 -b-pyramid strict -8x8dct 1 -direct-pred 1 -weightb 1 -weightp
  2 -deblock 0:0 -acodec libvorbis -async 1 -b:a:0 640k -metadata:s:a:0
  title="arc Vorbis 640k 5.1" OUTPUT-MOVIE.mkv

  I tried to do a 1 pass encode with the second pass command (without
  the -pass 2 option) for testing purposes and it didn't use more than 1
  core (total load of avconv remained ~130%, I assume it's 100% of
  libx264 plus some processing for the audio). At times it went up near
  400% but it never didn't stay at full load, most of the time (99% of
  the time) was spent on ~130%. I've also tried with -threads auto,
  -threads 0, -threads 4 but no luck.

  I'm using the avconv available in Ubuntu 13.10 repositories (I'm on
  Kubuntu 13.10): 6:0.8.10-0ubuntu0.13.10.1

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