[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):

 So, I tried a whole new approach, and it seems vastly superior.

 I modified psy's "Rate control" to work differently for VBR. Instead of
 using the bit reservoir, it just computes the optimum PE and scales it by
 quality. And it works nicely. I still had to push scalers a bit more on
 the allocator and do the LP filtering to reach the very low bit rates with
 VBR, but it's sounding a lot better.

 I'll do some more testing and then upload the updated patch.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2686#comment:104>
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