[FFmpeg-trac] #8066(avcodec:open): Bad quality encoding of high compressed audio by AAC encoder

[FFmpeg]

#8066: Bad quality encoding of high compressed audio by AAC encoder
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             Reporter:  Lirk        |                    Owner:  Lynne
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  aac         |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Comment (by Lynne):

 I need raw samples which encode with issues, not already encoded samples.
 I know where the issue is, its the transient decision analyzer that's
 lifted from the 3gpp spec.
 I also need samples which generate issues with a single encode and do not
 require cascading.
 Cascading isn't a good metric for overall encoder quality, since its
 easily cheated (libopusfile cheats, libopus can't). Its a test of the
 stability of the transient detector. The one I'm writing has far better
 stability.
 We could cheat, but its impractical for most purposes, since you can't
 cheat and mix multiple sources at the same time, and it requires piping
 side data between the decoder and the encoder, which will be stripped by
 any filtering in between.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8066#comment:12>
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