[FFmpeg-trac] #6434(undetermined:new): Segfault when using concat input (ffconcat) created with dvd2concat

[FFmpeg]

#6434: Segfault when using concat input (ffconcat) created with dvd2concat
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             Reporter:  fabienst     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Hello,

 I want to convert a video dvd with ffmpeg by using dvd2concat tool to
 generate the input.
 I first created a iso image of that dvd (with dvdbackup).
 It has to be noted that dvdbackup found read errors on the dvd and had to
 fix them by filling the blocks. But I'm not sure there are errors in the
 segment I provide

 In order not to upload the full iso I narrowed the issue down and created
 a smaller subset of the input ffconcat and vob.


 __With the original ffconcat file having 18 streams this command
 segfaults:__

 /mnt/packages/downloads/ffmpeg-git-20170601-64bit-static/ffmpeg -report -v
 9 -loglevel 99 -analyzeduration 460000k -probesize 300000k -safe 0
 -protocol_whitelist subfile,file,concat -f concat -i dvd2concat-
 18streams.txt  -c:v copy -c:a copy -c:s copy -map 0 -ignore_unknown -f vob
 dvd2concat-18streams.out.vob


 I found __the issue seems to come from some of the input streams__. So I
 removed some of them and it works. But I couldn't find any pattern. Here
 is the new command (same as above but with different input files)

 /mnt/packages/downloads/ffmpeg-git-20170601-64bit-static/ffmpeg -report -v
 9 -loglevel 99 -analyzeduration 460000k -probesize 300000k -safe 0
 -protocol_whitelist subfile,file,concat -f concat -i dvd2concat-
 14streams.txt  -c:v copy -c:a copy -c:s copy -map 0 -ignore_unknown -f vob
 dvd2concat-14streams.out.vob

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Ticket URL: <https://trac.ffmpeg.org/ticket/6434>
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