[FFmpeg-trac] #9749(undetermined:new): ffmpeg on mkv freezes system

[FFmpeg]

#9749: ffmpeg on mkv freezes system
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             Reporter:  eyrieowl  |                    Owner:  (none)
                 Type:  defect    |                   Status:  new
             Priority:  normal    |                Component:  undetermined
              Version:  4.4.1     |               Resolution:
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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Comment (by eyrieowl):

 Replying to [comment:2 mkver]:
 > 1. Does it become slower and slower until it freezes or does it just
 freeze at an instant?

 It freezes in an instant.  The first time I was just going about using the
 machine and then suddenly nothing worked.  Subsequently, I kept the
 terminal window open on my 2nd monitor and everything seemed to be going
 along just fine until the system just abruptly freezes.

 > 2. If you encode to mp4 first and then remux this mp4 (no reencoding) to
 Matroska, does the same issue happen or not?

 I don't have a good way to get it to mp4 first. I'm trying to shrink down
 and stick the blu-ray I just got in my plex so I can stream from my TVs,
 and the software I have rips it to mkv, there wasn't any option to get it
 to mp4, I'd have to use ffmpeg to get there.

 > 3. If you use "-live 1" or output to stdout "-f matroska -", does the
 same issue still happen?

 I don't know, I'll try those and get back to you.  Have to do it after the
 work day is over b/c I can't have my machine freezing up while I work.

 > 4. Does Valgrind show anything useful?

 No idea, I've never used Valgrind.  I'll look into trying that out as
 well. Doesn't look like the debug version is distributed with the flatpak
 version I have installed, so, will have to see how to get that.

 > 5. The Matroska muxer is very chatty with loglevel debug and higher; why
 did you not provide the output of this instead of only the ffmpeg -i
 <input> output (just use -report)?

 Mostly because of the way the http://ffmpeg.org/bugreports.html page is
 written, visually I glossed over that after the bullet-list that I tried
 to make sure to do each step of.  I can work to get that.

 > 6. Have you tried using different (i.e. older) versions of FFmpeg?

 No, I haven't. I have tried, as noted, with both 4.4.1 in the host and 5
 in the guest VM.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9749#comment:3>
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