[FFmpeg-trac] #11548(avformat:new): Extra keyframe when encoding with x264

[FFmpeg]

#11548: Extra keyframe when encoding with x264
-------------------------------------+-------------------------------------
             Reporter:  David        |                     Type:  defect
  Johansen                           |
               Status:  new          |                 Priority:  normal
            Component:  avformat     |                  Version:  7.1
             Keywords:               |               Blocked By:
  force_key_frames                   |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 ./ffmpeg -i repeated_keyframe.mp4 -c:v libx264 -force_key_frames source -f
 hls index.m3u8
 }}}

 It appears that the problem is that in `X264_frame` of `libx264.c` on
 `ctx->frame_num` of 318 the value `pic_out.b_keyframe` is `1` and it
 already was on 316. I tried adding `no-scenecut=1` and `min-keyint` but
 neither of those changed the output, and you can see that the second entry
 in `index.m3u8` is a very short duration (`#EXTINF:0.040000`) and this is
 an extra segments since there should only be two in `index.m3u8`

 I tried outputting to a `.mp4` which I assumed would reproduce the same
 issue, but it does not, so something is behaving different with the
 specific use of the `hls` output.

 Using this video as an example:
 https://drive.google.com/file/d/1oaK-
 G7jMdOk2Qt3yOXPvF8E7W8NuhtGv/view?usp=sharing
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11548>
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