[FFmpeg-trac] #9140(ffmpeg:new): aac gapless fail

FFmpeg trac at avcodec.org
Fri Mar 5 14:25:34 EET 2021

#9140: aac gapless fail
             Reporter:               |                     Type:  defect
  MarmiteSandwich                    |
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
                                     |  unspecified
             Keywords:  aac gapless  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:
 I would like to be able to play all aac audio files (.m4a) gaplessly ,
 i.e. without gaps or other interruptions.

 Occasionally, the transition from one file to another is not smooth, and I
 am supplying sample media where this is the case.

 I am submitting the 2 files referenced below, along with more details in

 Version unknown, because I am experiencing this via mpd which uses an
 ffmpeg decoder plugin with unknown origin. Reproducing quote below
 supplied by mpd developer.

 How to reproduce:
 ffmpeg -f concat -safe 0 -i concat.txt -c copy out.m4a

 ... where concat.txt contains:

 file '01 Track01 aac gapless fail.m4a'
 file '02 Track02 aac gapless fail.m4a'

 When I played out.m4a, I heard the same glitch as with MPD

Ticket URL: <https://trac.ffmpeg.org/ticket/9140>
FFmpeg <https://ffmpeg.org>
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