[FFmpeg-trac] #8467(undetermined:new): Audio artefacts encoding AAC

FFmpeg trac at avcodec.org
Mon Jan 13 16:11:46 EET 2020

#8467: Audio artefacts encoding AAC
             Reporter:  kmamal       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 I'm trying to create hls streams for various media. I have encountered an
 mp4 file which sounds terrible when passed through ffmpeg.

 The original file is here: https://s3-eu-

 Here's the report from ffmpeg: https://s3-eu-

 Here's the output file it produces: https://s3-eu-

 I notice that the original audio is also aac, so passing `-c:a copy` works
 ok and sounds normal. Sadly this is not a viable workaround for me, as I
 have to change bitrate and sample-rate.

 I have also noticed that changing the bitrate and sample rate, changes the
 "pattern" of the artefacts, but I couldn't find a combination that sounded

Ticket URL: <https://trac.ffmpeg.org/ticket/8467>
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