[FFmpeg-trac] #8843(avfilter:open): concat Segmentation fault filter_complex

FFmpeg trac at avcodec.org
Sun Aug 9 14:01:29 EEST 2020

#8843: concat Segmentation fault filter_complex
             Reporter:  dirvann     |                    Owner:  dirvann
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  crash amix  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
Changes (by Cigaes):

 * keywords:  crash concat => crash amix
 * component:  undetermined => avfilter


 I very much confirm the command-line I gave reproduces the problem with
 only two segments.

 The problem seems to be in the amix filter: it sends the last frame
 without a timestamp. The following patch protects concat from it and
 prevents the segfault, resulting in an error with a message instead.


 For a proper fix, amix needs to be investigated.

 I suggest trying to use amerge and pan instead.

Ticket URL: <https://trac.ffmpeg.org/ticket/8843#comment:13>
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