[x265] 4:4:4 support is now on the default branch

[Steve Borho]

Hello,

I want to announce that support for 4:4:4 input frames (full sized chroma
planes with no sub-sampling) is now on the default branch.

At this time, you are required to use --no-weightp and --cpuid 1 when using
the 4:4:4 color space (to avoid output mistakes, and decoder hash
mismatches) because there are problems with a few assembly routines and
with weightp when used with 4:4:4 content.  We hope to have both of those
issues resolved very soon.

To test this feature you either need 4:4:4 Y4M content, or use 4:4:4 YUV
content and add --input-csp 3 to your command line.

If you try this new feature and encounter problems, please let us know.
 Thanks.

-- 
Steve Borho

PS: Support for 4:2:2 color space is under development.
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