Xv is underdocumented
The protocol text (draft! still!) stops at XvGetPortAttribute. The five requests past that look like they were added around XFree86 4.0 or so, but they've never been properly documented.
The protocol text (draft! still!) stops at XvGetPortAttribute. The five requests past that look like they were added around XFree86 4.0 or so, but they've never been properly documented.