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https://www.reddit.com/r/LinuxActionShow/comments/1foev2/how_to_see_if_vdpau_is_working/
In order to check if your system is ready to decode using vdpau there is a utility called: vdpauinfo Which is similar to what vainfo does for VAAPI. Note that not all video players can use vdpau. For instance, as for now, VLC uses vaapi, which can be set to use vdpau underneath by installing: vdpau-va-driver
https://bugzilla.mozilla.org/show_bug.cgi?id=1210729
vaapi backend for VDPAU is terrible anyway; so will likely search for vdpau first and if not found search for va. supporting vdpau gives you support for nvidia and AMD (via open source driver) and vaapi gives you support for intel and amd (proprietary drivers)
https://battlepenguin.com/tech/nvidias-hardware-h264-1080p-codec-in-linux/
Feb 06, 2009 · The new interface from nVidia for hardware video decoding on Linux is known as the Video Decode and Presentation API for UNIX or VDPAU. It’s been available officially since the release of the 180.22 nVidia Linux drivers in January of 2009, but has been available in beta drives since last November starting with 180.06.
https://lists.gt.net/mythtv/users/404826?search_string=500%3b
VDPAU is provided by the nvidia GPU and the driver. Having > said that there are certainly ways for a manufacturers to screw things > up (not follow spec) or just make a crappy card that will fail. So > brand matters in terms up support and quality, but generally is not an > issue in terms of VDPAU support.
https://askubuntu.com/questions/45996/how-can-i-know-if-nvidia-vdpau-is-working-for-mplayer-vlc-totem
If you have nvidia hardware & can't or don't have vdpau support then don't bother with vlc which uses vaapi & is tricker to enable. Additionally the performance of vaapi on nvidia is very much hardware dependent. I've enabled here but don't use, ffmpeg multi-thread is better with my hardware in vlc.
https://www.mythtv.org/wiki/VDPAU
VDPAU (Video Decode and Presentation API for Unix) lets Nvidia and AMD/ATI uvd cards play video with hardware acceleration. It lets any Linux, Solaris, and FreeBSD system play files, including highly complex H.264 formats produced by the Hauppauge HD-PVR, that would otherwise require a …
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