[FFmpeg-trac] #7466(undetermined:open): scaled mjpeg movies from ProRes have lifted black

[FFmpeg]

#7466: scaled mjpeg movies from ProRes have lifted black
-------------------------------------+-------------------------------------
             Reporter:  fnordware    |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Balling):

 * status:  new => open


Comment:

 Wow, just wow. Apparently on this 12 bit sample:
 {{{
 ffplay -i short_GB-Master_3840x2304_en_AU_v014.mov -vf extractplanes=y
 }}}
 fails!! While
 {{{
 ffmpeg -i short_GB-Master_3840x2304_en_AU_v014.mov -vf extractplanes=y
 ouput.png
 }}}
 does produce correct 16 (or 4096 since the png that we got is 16 bit Y
 component only).

 Ah, yeah, the bug is reproducible, it is a problem in Y component.

 Work around is to add "crop=3840:2160,scale=1280x720:flags=bitexact"

 What a joke.

 Just wonderful. And U and V are 130 and not 128 as they are in ffmpeg, the
 application. "A" is correct though.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7466#comment:2>
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