tools/dav1d: add xxhash 3 muxer
Decoding times Chimera-AV1-8bit-1920x1080-6736kbps.ivf with 4 frame and 4 tile threads on a core i7-8550U (disabled turbo boost):
| muxer | time in seconds | on b85fbf6a (md5 optimizations) |
|---|---|---|
| null | 73.9 | 72.5 s |
| md5 | 181.5 | 99.8 s |
| xxh3 | 75.6 | 73.8 s |
Decoding Chimera-AV1-10bit-1920x1080-6191kbps.ivf with 6frame and 4 tile threads on the apple m1:
| muxer | time in seconds | on 2dca9b28 (md5 optimizations) |
|---|---|---|
| null | 27.9 s | 27.8 s |
| md5 | 219.6 s | 105.9 s |
| xxh3 | 28.5 s | 28.3 s |