Color Space

what color space does h264 mp4's use? is it srgb or rec 709? If the intention is direct download computer playback what is going to be the best route for graphics and images imported into the video?
 
I'm assuming that my rec 709 footage gets convereted automatically to ycbcr when i make an h264 compression? Does that mean the graphics/images I import should be rec 709 as apposed to srgb?
 
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