AV1 comes with built-in grain synthesis that allows for major bitrate reductions by sythesising, removing, and then re-adding grain on playback. However, this grain is only similar in nauture to the original, never identical. VMAF and other scoring systems will pick this up as difference to the original.
This can be somewhat alleviated by running VMAF with -filmgrain 0 which disables the addition on decoding and usually results in a more accurate (higher) score. Could this option be added to the next release of FFMetrics, possibly as a toggle or similar control?
AV1 comes with built-in grain synthesis that allows for major bitrate reductions by sythesising, removing, and then re-adding grain on playback. However, this grain is only similar in nauture to the original, never identical. VMAF and other scoring systems will pick this up as difference to the original.
This can be somewhat alleviated by running VMAF with
-filmgrain 0which disables the addition on decoding and usually results in a more accurate (higher) score. Could this option be added to the next release of FFMetrics, possibly as a toggle or similar control?