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My GMA 4500MHD Intel® GM45 Express Chipset supported VAAPI (See link below)

Video Acceleration API

But I get this error:

$ vainfo libva
libva: libva version 0.31.0
libva: va_getDriverName() returns 0
libva: Trying to open /usr/lib/dri/i965_drv_video.so
libva: va_openDriver() returns -1
vaInitialize failed with error code -1 (**unknown libva error**),exit

What's the reason for this? Advice please!

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