[FFmpeg-trac] #10886(ffmpeg:open): Transcoding video to x264 results in 1 second of frozen frames

[FFmpeg]

#10886: Transcoding video to x264 results in 1 second of frozen frames
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             Reporter:  Yuri Gorokhov  |                    Owner:  (none)
                 Type:  defect         |                   Status:  open
             Priority:  important      |                Component:  ffmpeg
              Version:  git-master     |               Resolution:
             Keywords:                 |               Blocked By:
             Blocking:  7.0            |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Description changed by Yuri Gorokhov:

Old description:

> Summary of the bug:
>
> Transcoding to x264 on 6.1.1 introduces frozen frames.
> Exact same steps on 6.0.1 produces correct video (no frozen frames)
>
> Details, repro step and sample videos are located here:
> https://github.com/yurigorokhov/ffmpeg_bug
>

> ffmpeg version 6.1.1
> built on alpine linux

New description:

 Summary of the bug:

 Transcoding to x264 on git-master introduces frozen frames.
 Exact same steps on 6.0.1 produces correct video (no frozen frames)


 Repro-steps:
 Download input video: https://github.com/yurigorokhov/ffmpeg_bug/raw/main
 /input-1fps.mov

 Run ffmpeg encoding command:

 {{{#!div style="font-size: 80%"
 Code highlighting:
   {{{#!bash
   ffmpeg -y -ignore_editlist true \
      -i /work/input-1fps.mov -r 30 \
      -vcodec libx264 \
      -x264opts keyint=30:scenecut=0 \
      -crf 34 \
      -vf "setpts=(N/(30*TB)),format=pix_fmts=yuv420p" \
      /work/output.mov
   }}}
 }}}


 Please note the frozen frames in the output video.

 Further details, repro step and sample videos are located here:
 https://github.com/yurigorokhov/ffmpeg_bug


 ffmpeg version 6.1.1
 built on alpine linux

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Ticket URL: <https://trac.ffmpeg.org/ticket/10886#comment:2>
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