MPEG2 -> x264 needs YUV -> RGB conversion?

[yesgrey]

I will begin to use x264 to convert some MPEG2 based blu-ray movies to x264, to ocuppy less space and keep the original quality (almost...).

I am thinking in using MeGUI for it. From all the process, there is something not very clear to me...
Does the MPEG2 movie has to be converted to RGB before the x264 encoding, or the YUV data decoded from MPEG2 is directly feeded to x264 without the YUV->RGB conversion?

Thanks.

[J_Darnley]

No, x264 will only accept YV12 (YUV 4:2:0) input. If you use MeGUI it should take care of it all.

[yesgrey]

I had looked to DGindex menus and saw the RGB conversion option and got that impression. I know it was very dumb doing it, but it's good to know it works as I expected.

Thanks.