Encode 4K at 4:4:4 possible?

[Roco]

Is there a way to encode 4K content with x.265 at 4:4:4?
If yes, what utilities/plugins and script will I need?

[sneaker_ger]

You don't need any special utilities or plugins. You can work with 4:4:4 YUV in AviSynth just fine via the YV24 colorspace. Then create an y4m pipe into x265.exe using e.g. avs2pipemod. Or if you want to feed raw x265 has the --input-csp parameter (http://x265.readthedocs.org/en/default/cli.html#cmdoption--input-csp).

[Roco]

You don't need any special utilities or plugins. You can work with 4:4:4 YUV in AviSynth just fine via the YV24 colorspace. Then create an y4m pipe into x265.exe using e.g. avs2pipemod. Or if you want to feed raw x265 has the --input-csp parameter (http://x265.readthedocs.org/en/default/cli.html#cmdoption--input-csp).
Thanks, megui has also x265 support, I'll try with that first.