[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):

 Replying to [comment:221 Kamedo2]:
 > What was the "quite significant bugs" of v6? I didn't find any problem
 in a non-blind listening test, and the v6 was extensively tested over many
 songs, speeches, tv source, and artificial sounds, and I believe v6 is
 safe and stable.

 Well, for one, holes (bands below hearing threshold) would bork a tonality
 boost loop, creating all sorts of issues, most notably when using short
 transform length, since the borking would get carried over to other
 windows.

 In essence, transients were broken. They still sounded alright most of the
 time, probably because of pure chance (ie: maybe there were no holes). But
 signals like Mahler, castanets and harpishcords tended to expose the bugs
 at lower bit rates.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:222>
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