[FFmpeg-trac] #2686(avcodec:open): Native AAC encoder collapses at high bitrates on some samples

FFmpeg trac at avcodec.org
Sun Oct 6 18:48:14 CEST 2013


#2686: Native AAC encoder collapses at high bitrates on some samples
-------------------------------------+-------------------------------------
             Reporter:  Kamedo2      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  aac          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by Kamedo2):

 The sound sample above is from here.
 http://www.hydrogenaudio.org/forums/index.php?showtopic=50056

 I've uploaded 2 problematic samples for the v6 aac, but they are extreme
 exceptions, rarely happens in the real encoding situations. Generally, the
 v6 patch is a very good patch, the quality is satisfactory. If you upload
 the patch that prevents the speech bitrate bloat, I'll start testing. The
 opponents are here.
 - v4 abr
 - v7 abr
 - v7 vbr
 - fdk-aac cbr
 - libfaac vbr
 - ac3 cbr
 - libmp3lame vbr

 BTW, I prefer the name v7 rather than the v6b, even if the revision is
 minor. It's easier to explain.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:200>
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