[FFmpeg-trac] #11381(undetermined:new): ffmpeg has started outputting yuvj420p not yuv420p

[FFmpeg]

#11381: ffmpeg has started outputting yuvj420p not yuv420p
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             Reporter:  ghjk987      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Tried using current ffmpeg in Artix Linux, also happens in ffmpeg-git AUR
 package built today

 $ ffmpeg -i PC277219.AVI -c:v libx264 -crf 25 -pix_fmt yuv420p test.mp4
 Input:
   Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc,
 bt470bg/unknown/unknown), 640x480, 13891 kb/s, 30 fps, 30 tbr, 30 tbn

 What it says it is making while encoding:
 Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv420p(pc,
 bt470bg/unknown/unknown, progressive), 640x480, q=2-31, 30 fps, 1000k tbn

 Output of ffmpeg -i test.mp4 on resulting video file:
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
 yuvj420p(pc, bt470bg/unknown/unknown, progressive), 640x480, 1411 kb/s, 30
 fps, 30 tbr, 1000k tbn (default)

 ffmpeg -i on video that was made in the same way late summer or autumn
 2024
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
 yuv420p(progressive), 640x480, 3346 kb/s, 30 fps, 30 tbr, 1000k tbn
 (default)


 The intention of making a video yuv420p is that it's multiplatform
 compatible whereas if it's left as the original yuvj422p it may not play
 on some Windows machines. As for the compatibility of yuvj420p, I have no
 idea, but I was surprised to see that after I had specifically told it to
 make something as yuv420p it then decided to make yuvj420p instead, and it
 didn't seem to do this before.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11381>
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