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

[FFmpeg]

#2686: Native AAC encoder collapses at high bitrates on some samples
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             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            |
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Comment (by klaussfreire):

 Well, v6 is almost ready. I just need to clean it up a bit. I'll probably
 do that tonight.

 In v6, my non-blind tests make me believe that {{{v6 vbr > v6 abr > v5
 abr}}}.

 Not sure how you compare abr vs vbr, what I do is pick a file or set of
 files, do a binary search of the quality level that results in the same
 overall file size, and then compare. In that kind of test, v6 vbr
 sometimes requires '''lots''' more bits for some pathological files
 (techno seems to drive it crazy, can't blame it). I exclude those, since
 they're pathological.

 When I push the patches to the ML, I'll make most of what makes v6 vbr go
 crazy on techno (the relatively high peak bit rate allowance) configurable
 anyway.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:167>
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