[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       |  klaussfreire
             Priority:  normal       |                   Status:  open
              Version:  git-master   |                Component:  avcodec
             Keywords:  aac          |               Resolution:
  regression                         |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by Kamedo2):

 Confirmed that the current git head 75147-g9d742d2 fixed the regression.

 Replying to [comment:411 atomnuker]:
 > As for the L, R, M and S signal/noise ratio, did you test that without
 PNS? That could have interfered. Could you tell me if IS sounded better
 before or after without PNS?
 I have tested {{{-b:a 128k -ar 44100}}}, {{{-b:a 192k -ar 32000}}},
 {{{-b:a 320k -ar 48000}}}, {{{-q:a 1 -ar 44100}}}, {{{-q:a 2 -ar 48000}}},
 without additional {{{-aac_pns enable}}} nor {{{-aac_is enable}}}
 settings.

 What optional settings should I test?

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Ticket URL: <https://trac.ffmpeg.org/ticket/2686#comment:412>
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