[FFmpeg-trac] #8337(avcodec:new): MPEG-4 ALS: Overread 8 when decoding

FFmpeg trac at avcodec.org
Sat Oct 26 23:57:37 EEST 2019

#8337: MPEG-4 ALS: Overread 8 when decoding
             Reporter:  rkjnsn   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:  als      |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
 (note: this may be a dupe of #5943, but in my case occurs with a regular
 16-bit stereo file.)

 Summary of the bug:
 File encoded using the mp4alsRM23 reference encoder decodes properly using
 the reference decoder, but results in the following error when decoding
 with FFmpeg:

 [als @ 0x555cf2fb15c0] Overread 8

 How to reproduce:
 % ffmpeg -i mpeg4-als-overread-8.mp4 -f hash -
 ffmpeg version N-95568-g1054752c56
   built with gcc 8.3.0 (Gentoo 8.3.0-r1 p1.1)

 Expected output:


 Actual output:

 [als @ 0x555cf2fb15c0] Overread 8
 [als @ 0x555cf2fb15c0] Reading frame data failed. Skipping RA unit.
 [out_0_0 @ 0x555cf2fffe80] EOF on sink link out_0_0:default.

 Attached are the log from the above command (decode.log) and the output of
 `ffmpeg -v 9 -loglevel 99 -i mpeg4-als-overread-8.mp4` (verbose.log). I'll
 be uploading mpeg4-als-overread-8.mp4 to upload.ffmpeg.org shortly.

Ticket URL: <https://trac.ffmpeg.org/ticket/8337>
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