[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 Thomas Mundt):

 I also just stumbled upon the very poor quality of the native aac encoder.
 There seems to be a fundamental problem in processing the high
 frequencies. To make the errors more audible I cascaded the transcoding 5
 times (aac_fast_128k_5cascades.m4a). This also shows that the twoloop
 encoder sounds different, but also bad (aac_twoloop_128k_5cascades.m4a).
 For comparison I uploaded a 5 times cascaded version with the Lame MP3
 encoder (mp3_5cascades.mp3).
 Furthermore it seems to be a regression. With ffmpeg 2.8 the native aac
 encoder sounds much better (aac_128k_5cascades_ffmpeg28.m4a). Not
 outstanding, but it comes much closer to MP3 encoding.
 I used Lirk's sample. The poor quality can be reproduced with any densely
 mixed music.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8066#comment:11>
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