The required 'xxhash.h' header can either be in system include directory
or can be copied to 'tools/output'.
The xxh3_128bits based muxer shows no significant slowdown compared to
the null muxer. Decoding times Chimera-AV1-8bit-1920x1080-6736kbps.ivf
with 4 frame and 4 tile threads on a core i7-8550U (disabled turbo boost):
null: 72.5 s
md5: 99.8 s
xxh3: 73.8 s
Decoding Chimera-AV1-10bit-1920x1080-6191kbps.ivf with 6 frame and 4 tile
threads on a m1 mc mini:
null: 27.8 s
md5: 105.9 s
xxh3: 28.3 s
Contains some useful stuff (vim, emacs swapfiles, ctags) and the /build
directory, since that's what the README uses.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
