[FFmpeg-trac] #7267(ffmpeg:new): Interlaced ProRes output has chroma assigned to wrong fields

[FFmpeg]

#7267: Interlaced ProRes output has chroma assigned to wrong fields
-------------------------------------+-------------------------------------
             Reporter:  jsevakis     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:
             Keywords:  prores       |  unspecified
  interlaced chroma                  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: Any interlaced source clip (tested with Blu-ray .m2ts,
 UtVideo, others) will convert to ProRes QuickTime file without complaint.
 However, if you analyze the output ProRes closely (or later attempt to
 IVTC it or separatefields() in AVIsynth), you will notice that the chroma
 is being assigned to the wrong frames or fields.
 How to reproduce: Encode any interlaced clip (animation is a good test),
 and encode using -vcodec prores to a .mov file. Analyze the result.
 {{{
 % ffmpeg -i input -c:v prores -profile:v 3 output
 ffmpeg version 3.x, 4.0.1
 (used pre-built binaries on Mac and Windows)
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7267>
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