[FFmpeg-trac] #6940(avcodec:new): Noise in encoded audio when using aac_at encoder

[FFmpeg]

#6940: Noise in encoded audio when using aac_at encoder
-------------------------------------+-------------------------------------
             Reporter:  zhangjiejun  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:               |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 Summary of the bug:

 Encoded audio file has some noticeable noise when when using aac_at
 encoder with aac_he profile. It also could be reproduced when using aac_lc
 with low bitrate <=64k.

 This issue could also be reproduced on iPhones when using libavcodec
 directly.

 To reproduce:
 {{{
 % ./ffmpeg -f lavfi -i sine=duration=10 -c:a aac_at -profile:a aac_he
 test.m4a

 ffmpeg version: git-master
 built on: macOS 10.13.2
 }}}

 I'll submit a patch.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6940>
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