[FFmpeg-trac] #2683(avcodec:open): Jpeg2000 decoder broken

[FFmpeg]

#2683: Jpeg2000 decoder broken
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             Reporter:  Aegwyn11     |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  j2k          |               Blocked By:
  regression                         |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by Aegwyn11):

 Replying to [comment:1 cehoyos]:
 > Workarounds are to configure with {{{--disable-decoder=jpeg2000}}} or to
 specify libopenjpeg as decoder with {{{-vcodec libopenjpeg}}} (in this
 case, the scaler will always be inserted).

 Trying the -c:v libopenjpeg workaround, it does work, but the input still
 shows as rgb48le and the output is rgb48le.

 I don't understand...I thought the content was stored as yuv422p10le (this
 is what FFmpeg reported when I encoded it). If FFmpeg was incorrectly
 identifying the encoded file as rgb48le, how is it that I get a valid
 rgb48le output file?

 I'm wondering...in the older "working" FFmpeg from March, does libopenjpeg
 internally convert YUV to RGB48 for encoding, and conversly decode to
 RGB48 and internally convert it backto YUV? If so, it is probably more
 correct for FFmpeg to only allow RGB input/output to libopenjpeg...letting
 libopenjpeg internally do the conversions isn't optimal and is misleading.

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2683#comment:2>
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