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What does "video output" mean in the context of media players?

Possible values are: x11, xv, vdpau etc. Are these drivers?

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up vote 4 down vote accepted

They're APIs. "x11" is raw bit-blitting (old and slow, almost never what you want to use barring bugs in the other APIs); "xv" is the X Video extension (most cross-hardware compatible); "vdpau" is Video Decode and Presentation API for Unix (nVidia-only).

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