This article describes the setup of VDPAU (Video Decode and Presentation API for Unix).
|nvidia-drivers||GeForce 8 (2. Generation) PureVideo HD and newer|
|S3||Chrome 430 GT and newer|
|Radeon||Support is available for r300 and newer|
Portage knows the global USE flag vdpau for enabling support for VDPAU in other packages. Enabling this USE flag will pull in x11-libs/libvdpau automatically:
After adding the above USE flag update the system so the changes take effect:
emerge --ask --changed-use --deep @world
The USE flags of libvdpau are:
USE flags for x11-libs/libvdpau VDPAU wrapper and trace libraries
||Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally|
||Enable direct rendering: used for accelerated 3D and some 2D, like DMA|
||Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)|
Systems using an AMD Radeon graphics driver will need to do the following.
AMD/Radeon specific steps
By default applications such as mplayer,vlc,vdpauinfo,... make VDPAU specific calls via libvdpau library. This library then dynamically loads appropriate back-end driver ( VDPAU driver specific to your hardware read more...). At the time of writing the mechanism to automatically decide which back-end driver needs to be loaded was not established. Currently libvdpau is hardcoded to load NVIDIA backend driver. It means that VDPAU will not work properly on Radeon cards. The only possible way to change that behavior is by specifying the correct back-end driver manually.
- First you need to find the name of the driver related to your hardware
(here we assume that the vdpau USE flag was enabled and the system was updated successfully). One way to find that name is by checking Xorg log file:
grep -i vdpau /var/log/Xorg.0.log
(II) RADEON(0): [DRI2] VDPAU driver: r300
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.
To do that you need to add the following line to ~/.bashrc file (provided that Bash is the default shell of a user who is going to run graphical environment). For the sample case described above the mentioned line would look like:
- Now x11-misc/vdpauinfo should show you an information about your VDPAU configuration instead of an error message.
display: :0 screen: 0 API version: 1 Information string: G3DVL VDPAU Driver Shared Library version 1.0 Video surface: name width height types ------------------------------------------- 420 2048 2048 NV12 YV12 422 2048 2048 NV12 YV12 444 2048 2048 NV12 YV12 Y8U8V8A8 V8U8Y8A8 Decoder capabilities: name level macbs width height ------------------------------------------- MPEG1 16 16384 2048 2048 MPEG2_SIMPLE 16 16384 2048 2048 MPEG2_MAIN 16 16384 2048 2048 ...
If the AMD GPU is not the primary GPU the
DRI_PRIME=1variable should also be set for applications to be able to use VDPAU.
NVIDIA specific steps
With the proprietary driver vdpau works out of the box, however nouveau driver requires firmware:
You may need to tweak the config files of the programs, you can make use of VDPAU.
Detect the available VDPAU video codecs:
mplayer -vc help | grep --color vdpa
Add them to the mplayer config file, e.g.:
The comma at the end of the
vcline is important! This tells MPlayer to fall back to other video out methods if the VDPAU driver is unsuccessful
VAAPI — provides access to graphics hardware (GPU) acceleration for video processing.