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Profiles and levels of video coding specification specify restrictions on the capabilities needed to decode the bitstreams.
The profile specifies the bit depth and subsampling formats supported, while the level defines resolution and performance characteristics.
A film grain synthesis module compliant to level X.Y of a video decoder must be able to correctly and on time generate film grain for all bitstreams (that can be decoded by the general decoding process of the video codec) that conform to that level.
When doing that, the film grain synthesis module must be able to produce output frames according to the display schedule if such is indicated by the bitstream.