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

[FFmpeg]

#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


Comment:

 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.

 https://ffmpeg.org/pipermail/ffmpeg-devel/2020-August/267563.html

 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>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker