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

FFmpeg trac at avcodec.org
Wed Jul 17 20:04:25 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):

 -cutoff 18000 seems to work, but the lowpass filter is too dull, compared
 to many practical encoders. libavcodec/psymodel.c has the constant
 FILT_ORDER, and changing the order from 4 to 8 sharpens the filter. But 12
 and 16 fails somehow.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:36>
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