[FFmpeg-trac] #7756(avcodec:new): add mastering display color volume and content light level information to hevc_metadata bitstream filter

[FFmpeg]

#7756: add mastering display color volume and content light level information to
hevc_metadata bitstream filter
---------------------------------+---------------------------------------
             Reporter:  sneaker  |                     Type:  enhancement
               Status:  new      |                 Priority:  wish
            Component:  avcodec  |                  Version:  git-master
             Keywords:  hevc     |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 It's currently already possible to use the "[https://ffmpeg.org/ffmpeg-
 bitstream-filters.html#hevc_005fmetadata hevc_metadata" bitstream filter]
 (-bsf:v hevc_metadata) to add or change colour_primaries,
 transfer_characteristics and matrix_coefficients of a given HEVC bitstream
 losslessly. The only things missing to allow ffmpeg to properly set HDR
 metadata on existing HEVC streams would be to set SMPTE ST 2086 Mastering
 display color volume SEI and Content light level information SEI message
 (MaxCLL and MaxFALL).

 This is useful because not all encoders currently allow setting those as
 well as in the case you forgot setting them during encode time.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7756>
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