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

FFmpeg trac at avcodec.org
Sat Jul 13 06:05:26 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):

 Isn't the lower spreading function applied too much? The quality of lower
 frequency is bad when the higher frequency bin is strong. And what makes
 320kbps particularly bad? The quality degrades when we have enough
 ('overkill') bits. I think something fatal is happening, like integer
 overflow or something.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:30>
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