x264 colorimetry

[Comatose]

I've read that x264 always uses BT.601, but I'm not sure anymore... so what colorimetry does x264 assume the input is in?
Does it change based on certain conditions?

[Dark Shikari]

x264 --longhelp

[Comatose]

Default is "undef"... which means what? I got the impression that it must assume some colorimetry.
I'm asking because I want to know what it did with my previous encodes >_>

Or am I misunderstanding the concept of colorimetry? :|

[Dark Shikari]

Default is "undef"... which means what? I got the impression that it must assume some colorimetry.
I'm asking because I want to know what it did with my previous encodes >_>

Or am I misunderstanding the concept of colorimetry? :|x264 doesn't care what your colorimetry is. The options are merely to signal the colorimetry in the bitstream to some hypothetical decoder that cares.

[Comatose]

Oh, I see. Thanks :D