Video and color space in Photoshop
 

I'm doing adjustments to some video clips in Photoshop and I was wondering what color space should I choose for it? When I open a video in Photoshop, it asks me "the document has not embedded RGB color profile, what would you like to do: 1) leave it as is (dont color manage), 2) assign profile (sRGB, Adobe RGB etc)". What should I do?