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- X_video_extension abstract "The X video extension, often abbreviated as XVideo or Xv, is a video output mechanism for the X Window System. The protocol was designed by David Carver; the specification for version 2 of the protocol was written in July 1991. It is mainly used today to resize video content in the video controller hardware in order to enlarge a given video or to watch it in full screen mode. Without XVideo, X would have to do this scaling on the main CPU. That requires a considerable amount of processing power, which could slow down or degrade the video stream; video controllers are specifically designed for this kind of computation, so can do it much more cheaply. Similarly, the X video extension can have the video controller perform color space conversions, and change the contrast, brightness, and hue of a displayed video stream.In order for this to work, three things have to come together: The video controller has to provide the required functions. The device driver software for the video controller and the X display server program have to implement the XVideo interface. The video playback software has to make use of this interface.Most modern video controllers provide the functions required for XVideo; this feature is known as hardware scaling and YUV acceleration or sometimes as 2D hardware acceleration. The XFree86 X display server has implemented XVideo since version 4.0.2. To check whether a given X display server supports XVideo, one can use the utility xdpyinfo. To check whether the video controller provides the required functions and whether the X device driver implements XVideo for any of them, one can use the xvinfo program.Video playback programs that run under the X Window system, such as MPlayer, MythTV or xine, typically have an option to enable XVideo output. It is very advisable to switch on this option if the system GPU video-hardware and device drivers supports XVideo – the speedup is very noticeable even on a fast CPU. While the protocol itself has features for reading and writing of video streams from and to video adapters, in practice today only the functions XvPutImage and XvShmPutImage are used: the client program repeatedly prepares images and passes them on to the graphics hardware to be scaled, converted and displayed.".
- X_video_extension author X.Org_Foundation.
- X_video_extension latestReleaseVersion "2.0".
- X_video_extension wikiPageExternalLink testxv.c.
- X_video_extension wikiPageExternalLink vnd.viewcvs-markup.
- X_video_extension wikiPageExternalLink testxv2.cc.
- X_video_extension wikiPageExternalLink xv-protocol-v2.txt.
- X_video_extension wikiPageExternalLink Xv.3.html.
- X_video_extension wikiPageID "737267".
- X_video_extension wikiPageRevisionID "593746967".
- X_video_extension author X.Org_Foundation.
- X_video_extension hasPhotoCollection X_video_extension.
- X_video_extension latestReleaseVersion "2".
- X_video_extension name "X video extension".
- X_video_extension subject Category:Application_layer_protocols.
- X_video_extension subject Category:Application_programming_interfaces.
- X_video_extension subject Category:Freedesktop.org.
- X_video_extension subject Category:X_Window_extensions.
- X_video_extension type Abstraction100002137.
- X_video_extension type ApplicationLayerProtocols.
- X_video_extension type Code106355894.
- X_video_extension type CodingSystem106353757.
- X_video_extension type Communication100033020.
- X_video_extension type Delay115272029.
- X_video_extension type Direction106786629.
- X_video_extension type Extension115272382.
- X_video_extension type Measure100033615.
- X_video_extension type Message106598915.
- X_video_extension type Pause115271008.
- X_video_extension type Protocol106665108.
- X_video_extension type Rule106652242.
- X_video_extension type Software106566077.
- X_video_extension type TimeInterval115269513.
- X_video_extension type Writing106359877.
- X_video_extension type WrittenCommunication106349220.
- X_video_extension type XWindowExtensions.
- X_video_extension type Software.
- X_video_extension type Work.
- X_video_extension type CreativeWork.
- X_video_extension type InformationEntity.
- X_video_extension comment "The X video extension, often abbreviated as XVideo or Xv, is a video output mechanism for the X Window System. The protocol was designed by David Carver; the specification for version 2 of the protocol was written in July 1991. It is mainly used today to resize video content in the video controller hardware in order to enlarge a given video or to watch it in full screen mode. Without XVideo, X would have to do this scaling on the main CPU.".
- X_video_extension label "X video extension".
- X_video_extension label "Расширение X video".
- X_video_extension sameAs m.0370yl.
- X_video_extension sameAs Q4390685.
- X_video_extension sameAs Q4390685.
- X_video_extension sameAs X_video_extension.
- X_video_extension wasDerivedFrom X_video_extension?oldid=593746967.
- X_video_extension homepage xv-protocol-v2.txt.
- X_video_extension isPrimaryTopicOf X_video_extension.
- X_video_extension name "X video extension".