[FFmpeg-trac] #5972(undetermined:new): Zscale st_2084 transfer function from ZIMG

[FFmpeg]

#5972: Zscale st_2084 transfer function from ZIMG
-------------------------------------+-------------------------------------
             Reporter:  muxketeer    |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  HDR zscale   |               Blocked By:
  smpte2084_transfer_function        |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 When compiling ffmpeg with the latest version of ZIMG and then using the
 'zscale' video filter, unable to make use of the latest transfer
 functions/primatries/matrix available in ZIMG via zscale video filter.
 Zscale allows one to specify input/output color: primaries, transfer
 function, matrix, and do the transformations in a proper manner.
 A couple of months back, ZIMG added the ability to specify ’st_2084’ (the
 SMPTE 2084 color transfer function for HDR) as a transfer function.  When
 compiling ffmpeg with the latest version of ZIMG, expected result was the
 ability to specify these new values to arguments in zscale , such as
 ‘transfer.’
 Does zscale need to be made aware of new transfer functions in ZIMG when
 they appear?

 How to reproduce:
 {{{
 ./ffmpeg -loglevel debug -y -start_number 86400 -f image2 -r 23.976 -i
 /path/to/my/422-RGB/tiffSequence%5d.tiff -t 2 -sws_flags
 lanczos+accurate_rnd+print_info+full_chroma_int -vf
 showinfo,zscale=rangein=full:primariesin=2020:transferin=st_2084:matrixin=2020_ncl:range=full:primaries=2020:transfer=st_2084:matrix=2020_ncl,format=yuv420p10
 -c:v rawvideo /path/to/raw/output.yuv

 ffmpeg version: N-82492-g605f308 Copyright (c) 2000-2016 the FFmpeg
 developers

  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)

  configuration: --prefix=/root/ffmpeg_build --pkg-config-flags=--static
 --extra-cflags=-I/root/ffmpeg_build/include --extra-
 ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --enable-gpl --enable-
 libzimg --enable-nonfree

  libavutil      55. 40.100 / 55. 40.100

  libavcodec     57. 66.103 / 57. 66.103

  libavformat    57. 57.100 / 57. 57.100

  libavdevice    57.  2.100 / 57.  2.100

  libavfilter     6. 67.100 /  6. 67.100

  libswscale      4.  3.101 /  4.  3.101

  libswresample   2.  4.100 /  2.  4.100

  libpostproc    54.  2.100 / 54.  2.100


 }}}
 compiled a local version of zimg before compiling ffmpeg. then compiled
 ffmpeg

 grabbed latest zimg from: https://github.com/sekrit-twc/zimg.git (latest
 as of 18NOV2016)

 built on … clean image of Ubuntu 14.04.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5972>
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