[FFmpeg-trac] #7747(undetermined:new): Crackling noises in audio on iPod

FFmpeg trac at avcodec.org
Thu Feb 21 19:39:59 EET 2019

#7747: Crackling noises in audio on iPod
             Reporter:  forthrin     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Some converted audio and video files get sporadic cracking noises during
 playback on an iPod Nano 3rd generation.

 It can happen dozens of times during 30 minutes. Some times 3 times per
 second, some times 20 seconds apart. There is no clear pattern.

 Enclosed is a small excerpt that includes:

 1. An original input file
 2. The output file from FFmpeg
 3. What the output file sounds like when played on the iPod (played
 through a speaker and recorded with a microphone)

 The command line was a simple `ffmpeg -i original.ac3 converted.m4a`.
 Version is latest Git head, run on macOS.

 What could cause these crackling noises? Is this a known issue? How can I
 prevent them from occurring?

Ticket URL: <https://trac.ffmpeg.org/ticket/7747>
FFmpeg <https://ffmpeg.org>
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