[FFmpeg-trac] #7163(avcodec:closed): 12-bit ProRes not supported

FFmpeg trac at avcodec.org
Fri Apr 10 00:53:48 EEST 2020


#7163: 12-bit ProRes not supported
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             Reporter:  spookybathtub  |                    Owner:
                 Type:  enhancement    |                   Status:  closed
             Priority:  wish           |                Component:  avcodec
              Version:  git-master     |               Resolution:  fixed
             Keywords:  prores         |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by pdr0):

 Replying to [comment:20 spookybathtub]:
 > Arri Meta Extract is not definitive proof.  Neither is any other
 metadata reading tool, because there is no "bit depth" metadata flag to
 read in a ProRes QT.  FFmpeg displays yuv422p10le not because it is
 "detected", rather it's the pixel format we choose to decode.

 I suppose it's not "definitive proof", but it's tagged fourcc "apch."
 This is Prores HQ 422.  I suppose someone might have hex edited it for
 some reason, or a substituted a hacked firmware version in the camera, but
 that's getting pretty far fetched .

 The Prores white paper says Prores HQ supports 10bit. It does not
 explicitly mention that 12 bit or 16 bit ''not'' supported by this
 profile, but that's certainly implied. It also says Prores 4444 supports
 up to 16bit , both RGB and YCbCr

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Ticket URL: <https://trac.ffmpeg.org/ticket/7163#comment:21>
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