VDPAU

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This article describes the setup of VDPAU (Video Decode and Presentation API for Unix).

Hardware support

Driver Chipset
nvidia-drivers GeForce 8 (2. Generation) PureVideo HD and newer
S3 Chrome 430 GT and newer
Radeon Support is available for r600 and newer

Installation

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:

File/etc/portage/make.conf

USE="... vdpau ..."

The USE flags of libvdpau are:

→ Information about USE flags
USE flag Default Recommended Description
doc No Adds extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
dri Yes Enable direct rendering: used for accelerated 3D and some 2D, like DMA

After setting this you want to update your system so the changes take effect:

root # emerge --ask --changed-use --deep @world
Note
In the case of Radeon driver you additionally need to do the following

Radeon specific install 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:

user $ cat /var/log/Xorg.0.log | grep -i vdpau
(II) RADEON(0): [DRI2] VDPAU driver: r600

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 (r600 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:

File~/.bashrcLoged as a user who run graphical interface

export VDPAU_DRIVER=r600
.
  • Now x11-misc/vdpauinfo should show you an information about your VDPAU configuration instead of an error message.
user $ vdpauinfo
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

...

Other Software

Configuration

You may need to tweak the config files of the programs, you can make use of VDPAU.

mplayer

Detect the available VDPAU video codecs:

user $ mplayer -vc help | grep --color vdpa

Add them to the mplayer config file, e.g.:

File/etc/mplayer/mplayer.conf

[vo.vdpau]
vc=ffh264vdpau,ffodivxvdpau,ffmpeg12vdpau,
Note
The comma at the end of the vc line is important! This tells MPlayer to fall back to other video out methods if the VDPAU driver is unsuccessful