Realistic Film Grain Rendering for VapourSynth, implemented in Metal. A port of https://github.com/AmusementClub/vs-fgrain-cuda/
Prototype:
core.fgrain_metal.Add(clip clip[, int num_iterations = 800, float grain_radius_mean = 0.1, float grain_radius_std=0.0, float sigma = 0.8, int seed = 0])
Currently only grays is supported.
Build with Xcode and copy dylib and default.metallib to /usr/local/lib/vapoursynth