[FFmpeg-trac] #5910(undetermined:new): AAC to PCM conversion inserts extra silence in the beginning

FFmpeg trac at avcodec.org
Tue Nov 1 11:42:09 EET 2016

#5910: AAC to PCM conversion inserts extra silence in the beginning
             Reporter:               |                    Owner:
  jwilhelmsson                       |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  aac pcm      |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |

Comment (by jwilhelmsson):

 Sorry for the delay.

 I have to say that it sounds unlikely that there would be some fixed value
 since I'm getting different values for different files, and identical
 results for extracting from mp4/mov containers and converting from
 standalone aac files. But if I knew the reason for the differences I
 wouldn't have opened this ticket in the first place, so...

 I am attaching a zip with six movie files. There's one from each of the
 different offset errors (the movie, "g", and the two TV series "td" and
 "tj"). Since I noticed that ffmpeg rewrites some of the information in the
 beginning of the file I've also cut a piece of each original file with dd,
 matching the number of bytes in the ffmpeg-cut files. The dd files are not
 playable, but I figured it might be worth something to have the original
 untouched data. The zip file also contains a text file with the ffmpeg
 command lines and outputs, and the dd command lines (no useful output).

Ticket URL: <https://trac.ffmpeg.org/ticket/5910#comment:13>
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