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Rust implementation of the SSIMULACRA2 quality metric

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Potential option for #11. For every scale, we first convert to Xyb (which uses the same `data: Vec` as `LinearRgb`) and then to a planar data representation. Instead of a...

The rayon feature is useful, but can be harmful to performance in some circumstances: rust-av/ssimulacra2_bin#21 There might be a better way of splitting work across threads that integrates itself better...

The blur in particular is still rather slow despite our many efforts to optimize it

| Benchmark | Older Version | Newer Version(Use Libblur) | Newer Version(Implement directly) | | ------------------ | ------------- | -------------------------- | --------------------------------- | | **ssimulacra2** | 20.16 ms | 15.96...

I'm using the same material but getting different scores ![ssimulacra2_rs](https://github.com/user-attachments/assets/d3101e5a-f94c-4bb8-9a15-a772f31ae3b1) take a lossless source, throw it through ffmpeg and notice image & video score differently `ffmpeg -hide_banner -colorspace bt709 -color_primaries...