[FFmpeg-trac] #4168(undetermined:new): defect : mpeg2 interlaced yuv420 chroma incorrectly decoded

[FFmpeg]

#4168: defect : mpeg2 interlaced yuv420 chroma incorrectly decoded
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             Reporter:  Cyril        |                    Owner:  (none)
  Lambin                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Cyril Lambin):

 Replying to [comment:37 Balling]:
 > Finally
 https://patchwork.ffmpeg.org/project/ffmpeg/patch/20231013142205.60658-1-ffmpeg@haasn.xyz/

 About time :)

 I stopped counting the quantity of video archives that are plagged with
 this bug since ffmpeg is used in so many software.
 One recent example, a very rare archive by Daft Punk recently posted on
 their YouTube channel:
 https://shelter.moe/@fenarinarsa/111234979232590645

 On my side, I do all video archives in 4:2:2 chroma (MP4 studio) as a
 workaround to this bug, else there's a 99.99% chance it gets badly decoded
 for deinterlacing/recompression.

 The only software I know so far that compensate for this bug by relocating
 chroma data after decoding if it detects 4:2:0 video is the QTGMC filter
 for AviSynth.
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Ticket URL: <https://trac.ffmpeg.org/ticket/4168#comment:38>
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