[FFmpeg-trac] #9272(ffmpeg:new): Unstable outputs of ffmpeg

FFmpeg trac at avcodec.org
Tue Oct 26 00:22:52 EEST 2021

#9272: Unstable outputs of ffmpeg
             Reporter:  Shaohua Li  |                    Owner:  (none)
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
Comment (by Shaohua Li):

 Replying to [comment:2 Nicolas George]:
 > The problem is not encoding, it is decoding, and it is with the video.
 It can be observed with just:
 > {{{
 > ffmpeg -an -i unstable_input.avi -f framecrc -y test01.crc
 > }}}
 > It shows CRC differences as soon as the second frame.
 > It is a threading issue: adding {{{-threads 1}}} makes the differences
 go away, and helgrind prints a lot of errors. I will attach a log from an
 installed ffmpeg, without debug symbols.

 Hi, I reported another related issue, where the output files keep changes
 and ''-threads 1'' won't work. (see https://trac.ffmpeg.org/ticket/9476)
Ticket URL: <https://trac.ffmpeg.org/ticket/9272#comment:4>
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