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XVideo can also be used to accelerate video playback during the drawing of windows using an Open GL Framebuffer Object or pbuffer.Metacity, an X window manager uses compositing in this way.To check whether a given X display server supports XVideo, one can use the utility program.Video playback programs that run under the X Window system, such as MPlayer, Myth TV or xine, typically have an option to enable XVideo output.When the video stream is added to the output, the graphics card can simply scan the co-ordinates of the canvas.When it encounters green, it knows it has found a visible portion of the video window, and only draws those portions of the video.It is mainly used today to resize video content in the video controller hardware in order to enlarge a given video or to watch it in full screen mode.Without XVideo, X would have to do this scaling on the main CPU.

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When all windows have been drawn, windows covering the video player will block out the green color.

It is very advisable to switch on this option if the system GPU video-hardware and device drivers supports XVideo and more modern rendering systems such as Open GL and VDPAU are unavailable – the speedup is very noticeable even on a fast CPU.

While the protocol itself has features for reading and writing of video streams from and to video adapters, in practice today only the functions After video has been scaled and prepared for display on the video card, it must be displayed.

The compositing can also make use of 3D pipelines accelerations such as GLX_EXT_texture_from_pixmap.

Among other things, this process allows many video outputs to share the same screen without interfering with each other.

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