[FFmpeg-devel] [PATCH v2 1/3] libavutil: introduce AVFilmGrainParams side data

[Lynne]

This patch introduces a new frame side data type AVFilmGrainParams for use 
with video codecs which are able to use it.

It is generalized rather than being AV1 specific as AV2 is expected to carry
the same data, as well as the fact there already exist rarely-used specifications
for both H.264 and HEVC.

Patch attached.

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