[MPlayer-users] vsync not working

[Etienne SANDRE]

> Yes, video overlay only works on the _first_ head. It's a limitation
> of the hardware. The other head will use the video blitter for xv,
> which _will_ tear, and there's nothing you can do about it. So switch
> the primary head to the one you'll be watching video on.

How do you know blitter or overlay is used? I don't see it in the output and 
it should help me a lot to see which one is used during a few tests.
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Etienne SANDRE