[FFmpeg-trac] #7550(undetermined:new): Audible artifacts when converting from WAV to AAC

FFmpeg trac at avcodec.org
Sat Nov 17 16:44:53 EET 2018

#7550: Audible artifacts when converting from WAV to AAC
             Reporter:  sleroux      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  aac          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by sleroux):

 Hi @cehoyos. Thank you for your comment.

 > Your input sample is completely silent between 5:30:930 and 5:30:940.
 From what I can hear here, it is not completely silent in the original:

 ffplay -ss 00:05:29 http://www.chicoree.fr/pub/ffmpeg-wav-to-aac-
 If you use a visualization tool, you may need to look at the waveform
 using a log/dB scale instead of a linear one.

 The speaker saids "[...]Look at the Bluetooth hardware indi`^`cator you
 may see it blinks rapidly[...]", where `^` denotes the point where the
 artifact is audible. It's while the "I" sound is decaying, and just before
 the attack for the  "CA" sound.

 With quality headphones, I can clearly hear the difference with
 ffplay -ss 00:05:29 http://www.chicoree.fr/pub/ffmpeg-wav-to-aac-
 In that latter case, there is undoubtedly some extra noise on the right
 channel. Actually, this is that asymmetry that makes me noticed it.

 Let me know if it was unclear.

Ticket URL: <https://trac.ffmpeg.org/ticket/7550#comment:3>
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