Netflix enabled AV1 film grain synthesis at scale to improve streaming quality.
Film grain synthesis uses an auto-regressive model to recreate grain patterns.
It applies a scaling function to adjust grain intensity under different brightness.
The encoding process denoises the video, compresses it, and sends grain parameters for playback.
FGS streams reduce bitrate by around 66% on heavily grainy titles.
On average, FGS lowers bitrate by 36% for high resolutions (1080p+).
A/B tests show fewer playback errors, fewer rebuffers, and faster start times.
Viewers can experience better visuals and potentially higher streaming resolutions.
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