[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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Description changed by eyrieowl:

Old description:

> Summary of the bug:
>
> I have been running into an issue where when I try to transcode an mkv
> file above...some duration which I'm not quite certain about, it freezes
> the whole system after it's encoded to a certain point in time.  With the
> input file that I'm sending information about, this seems to happen after
> it's encoded about 20 min of the movie.  I'm running on Linux (extra info
> below); however, I've also attempted to get around the issue by running
> the encode in a VMWare VM running a Windows 10 guest and ffmpeg 5...and I
> saw the same behavior.  I limited the guest to only two cores, and it
> never had the full memory available, and the same thing happened.  It
> didn't just freeze the guest, it froze the entire machine....  When this
> happens, the machine is entirely unresponsive.  The screen is still on,
> the time frozen, and no keyboard input or mouse input or remote login is
> possible.  I've left the machine sitting overnight and well into the next
> day, nothing changes, the only remedy is to hard power off the machine.
> I've also tried using taskset in the linux host to limit the CPU ffmpeg
> can use, and that had the same result as well.
>
> My speculation is that something ffmpeg is doing is maybe hitting a bug
> in the CPU?  I don't know.  It does seem to be something about the mkv
> package...I've encoded many mp4 files without an issue.  But I've encoded
> a couple mkv which both had the same outcome.  I'll include information
> for both.  I think I can't provide the original files, though, for legal
> reasons, but also size.  The first file is 41GB.  I'm happy to do
> whatever steps you want to gather more information, though.
>
> I also tried using Handbrake, with the goal of having it pick a different
> set of options.  That also failed.
>
> How to reproduce:
> {{{
> % ffmpeg -i THE\ GODFATHER_t00.mkv -map 0 -c:s copy TheGodfather.mkv
> }}}

New description:

 Summary of the bug:

 I have been running into an issue where when I try to transcode an mkv
 file above...some duration which I'm not quite certain about, it freezes
 the whole system after it's encoded to a certain point in time.  With the
 input file that I'm sending information about, this seems to happen after
 it's encoded about 20 min of the movie.  I'm running on Linux (extra info
 below); however, I've also attempted to get around the issue by running
 the encode in a VMWare VM running a Windows 10 guest and ffmpeg 5...and I
 saw the same behavior.  I limited the guest to only two cores, and it
 never had the full memory available, and the same thing happened.  It
 didn't just freeze the guest, it froze the entire machine....  When this
 happens, the machine is entirely unresponsive.  The screen is still on,
 the time frozen, and no keyboard input or mouse input or remote login is
 possible.  I've left the machine sitting overnight and well into the next
 day, nothing changes, the only remedy is to hard power off the machine.
 I've also tried using taskset in the linux host to limit the CPU ffmpeg
 can use, and that had the same result as well.

 My speculation is that something ffmpeg is doing is maybe hitting a bug in
 the CPU?  I don't know.  It does seem to be something about the mkv
 package...I've encoded many mp4 files without an issue.  But I've encoded
 a couple mkv which both had the same outcome.  I'll include information
 for both.  I think I can't provide the original files, though, for legal
 reasons, but also size.  The first file is 41GB.  I'm happy to do whatever
 steps you want to gather more information, though.

 I also tried using Handbrake, with the goal of having it pick a different
 set of options.  That also failed.

 How to reproduce:
 {{{
 % # the command for the first file
 % ffmpeg -i THE\ GODFATHER_t00.mkv -map 0 -c:s copy TheGodfather.mkv
 %
 % # the command for the second file
 % ffmpeg -i Turn\ -\ Washington\'s\ Spies\ -\ s02e01\ -\ Thoughts\ of\ a\
 Free\ Man.mkv  -vf scale=-1:720 output.mkv
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/9749#comment:1>
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