Created Thursday 23 February 2017
VA-API and VDPAU makes is possible for video cards to decode/encode video and thus offloade some workforce from the CPU. It says that it will therefore save power (by offloading to CPU) but I do seriously doubt that, since it'll just bring an even more power-demanding device into play.
VA-API is for the Intel Driver and VDPAU is for the Nvidia driver.
Installation
# This uses VDPAU as backend for VA-API
$ pacman -S libva-vdpau-driver
# These two packages will make VA-API work as backend for VDPAU
$ pacman -S libvdpau-va-gl libva-intel-driver
Verifying
# To verify VA-API, install libva
$ pacman -S libva
# and run
$ vainfo
# You should get something like below, a driver has been found is it should handle the rest itself
# To verify VDPAU, install vdpauinfo
$ pacman -S vdpauinfo
# and run
$ vdpauinfo
# You should have something like this in the output