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https://www.mythtv.org/wiki/VDPAU
List of all NVIDIA chipsets and level of VDPAU support. Note: This list is dependent on the driver version. This currently points to the version 260.19.36 README file appendix. Newer versions of the driver may add other GPUs to the list and other capabilities.
https://en.wikipedia.org/wiki/VDPAU
VDPAU is implemented in X11 software device drivers, but relies on acceleration features in the hardware GPU. All Nvidia graphic cards for which the driver implements VDPAU are listed in Nvidia PureVideo. S3 Graphics added VDPAU to the Linux drivers of their Chrome 400 video cards. As of version 14.02.17 of its Linux device driver, VDPAU is ...License: MIT License
https://download.nvidia.com/XFree86/Linux-x86_64/304.137/README/vdpausupport.html
This release includes support for the Video Decode and Presentation API for Unix-like systems (VDPAU) on most GeForce 8 series and newer add-in cards, as well as motherboard chipsets with integrated graphics that have PureVideo support based on these GPUs.
https://www.phoronix.com/scan.php?page=search&q=VDPAU
VDPAU. VDPAU is the Video Decode and Presentation API for Unix. VDPAU was initially developed by NVIDIA as a means of video acceleration for their binary video driver but has since gained support within Gallium3D and other drivers independent of NVIDIA.
https://devtalk.nvidia.com/default/topic/940228/linux/vdpau-expose-hevc-main10-support-where-available-on-die/
Nov 23, 2016 · Currently, VDPAU does not seem to support HEVC Main10 at all even where the hardware should support it. (For example, `vdpauinfo` returns “--- not supported ---” on HEVC_MAIN_10 on a GTX 960) From what I understand, HEVC Main10 is supported via other hardware decoding APIs (e.g. d3d11va) on suitable hardware.
https://wiki.gentoo.org/wiki/VDPAU
The output will show if VDPAU driver has been initialized properly (two leading (II) letters in the sample output above). It also should specify the name of back-end driver (r300 in the sample output). Now you can manually setup the name of back-end driver with help of VDPAU_DRIVER environment variable.
https://bugzilla.mozilla.org/show_bug.cgi?id=1210729
(In reply to Jean-Yves Avenard [:jya] from comment #2) > 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) vdpau is also ...
https://en.wikipedia.org/wiki/Nvidia_PureVideo
Support for PureVideo has been available in Nvidia's proprietary driver version 180 since October 2008 through VDPAU. Since April 2013 [citation needed] nouveau also supports PureVideo hardware and provides access to it through VDPAU and partly through XvMC. Microsoft Windows
http://steamcommunity.com/groups/homestream/discussions/0/540732888895002246/
So it looks as Steam somehow recognizes the VDPAU support but is unable to use it. I can confirm that VDPAU is actually working on my system, as i'm also using a custom XBMC build that (exclusively) leverages VDPAU for hardware accelerated x264/h264 decoding which is working fine.
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