[FFmpeg-trac] #7513(undetermined:new): colormatrix filter fails with hwaccel

[FFmpeg]

#7513: colormatrix filter fails with hwaccel
-------------------------------------+-------------------------------------
             Reporter:  msiders      |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:  git-
             Keywords:               |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 Summary of the trouble:

 When using the "colormatrix" filter with hwaccel enabled for GPU
 transcoding the process fails. The matrix translation is '''required'''
 when different color spaces are used (BT.709 for HD, BT.601 for SD,
 BT.2020 for UHD).

 Here an example to reproduce:
 {{{
 ffmpeg -hwaccel qsv \
  -c:v h264_qsv \
  -i input.ts \
  -filter_complex
 "[i:256]deinterlace_qsv,scale_qsv=720:576,fps=25,colormatrix=bt709:bt601[out]"
 \
  -map [out] -map i:257
  -c:0 mpeg2_qsv -preset medium \
  -c:1 copy \
  -f mpegts output.ts
 }}}

 So, the "colormatrix" filter needs to be enhanced to support a GPU
 context.

 Regards.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7513>
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