Video processing expansion card

Video processing expansion card

A Video processing expansion card is a computer expansion card that allows a computer to receive television signals, record video, and/or playback video content. cite web
url=http://www.ati.com/products/catalyst/video_WhitePaper.pdf
title=Video 101
publisher=ATI TECHNOLOGIES INC.
author=White Paper
accessdate=2006-07-18
]

Video capture

Video capture cards are a class of video capture devices designed to plug directly into expansion slots in personal computers and servers. Models from many manufacturers are available; all comply with one of the popular host bus standards including PCI, newer PCI Express (PCIe) or AGP bus interfaces.

These cards typically include one or more software drivers to expose the cards' features, via various operating systems, to software applications that further process the video for specific purposes. As a class, the cards are used to capture baseband analog composite video, S-Video, and, in models equipped with tuners, RF modulated video. Some specialized cards support digital video via digital video delivery standards including Serial Digital Interface (SDI) and, more recently, the emerging HDMI standard. These digital models often support both standard definition (SD) and high definition (HD) variants.

While most PCI and PCI-Express capture devices are dedicated to that purpose, AGP capture devices are usually included with the graphics adapted on the board as an all-in-one package. Unlike video editing cards, these cards tend to not have dedicated hardware for processing video beyond the analog-to-digital conversion. Most, but not all, video capture cards also support one or more channels of audio.

There are many applications for video capture cards including converting a live analog source into some type of analog or digital media, (such as a VHS tape to a DVD), archiving, video editing, scheduled recording (such as a DVR), television tuning, or video surveillance. The cards may have significantly different designs to optimally support each of these functions.

One of the most popular applications for video capture cards is to capture video and audio for live Internet video streaming. The live stream can also be simultaneously archived and formatted for playable-on-demand video (VOD). The capture cards used for this purpose are typically purchased, installed, and configured in host PC systems by hobbyists or systems integrators. Some care is required to select suitable host systems for video encoding, particularly HD applications which are more affected by CPU performance, number of CPU cores, and certain motherboard characteristics that heavily influence capture performance.

System-level products are also available preconfigured for these applications; these are typically called video encoders or media encoders and include a complement of relevant application software.

Video editing

Once a video source is digitally encoded in the computer, it can be edited with a variety of software tools available for the given computer platform. However, some capture cards are designed with this specifically in mind. These cards often have dedicated hardware for the express purpose of handling the rendering of video streams (instead of the CPU). Some of these cards even offer real-time video editing, or a specialized monitor connection which only displays the output of a video being edited as it would appear on a TV (sometimes an actual TV is used).

Editing cards also assist in the of sound on video clips, adding new sounds, synchronization of sound with video clip (e.g. lip movements are perfectly matched with dialogues), and other common post-production tasks like title generation.

External Capture Device

While external devices operate outside the PC chassis in most cases, their functionality is largely the same, in some cases identical silicon. Instead of using a PCI or AGP interface, an external device would use USB, FireWire, or a PC card to interface with the computer. These devices are more commonly associated with mobile or laptop computing because of their small sizes or portability.

Some MiniDV and Digital8 camcorders, primarily those by Sony, have analog inputs that can transcode to DV digital video and simultaneously output same via FireWire to a computer - these could also be recognized as video capture devices.

Manufacturers

*Asus
*Imperx,Inc.
*Matrox
*Pinnacle Systems
*Canopus
*ATI
*Turtle Beach
*Hauppauge
*Plextor
*GeoVision Inc.

ee also

*Expansion card
*Video
*TV tuner card

References

External links

* [http://linuxtv.org/v4lwiki/index.php/Main_Page Index of video capture hardware, from Video4Linux Wiki]
* [http://linuxtv.org/v4lwiki/index.php/List_survey_of_cards_in_use_now List of video capture cards]


Wikimedia Foundation. 2010.

Нужно сделать НИР?

Look at other dictionaries:

  • Expansion card — Example of a PCI Digital I/O Expansion Card. The expansion card (also expansion board, adapter card or accessory card) in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard or backplane to… …   Wikipedia

  • Video card — image = Gpu connections.png Connects to Motherboard via one of: ISA MCA VLB PCI AGP PCI X PCI Express Others Display via one of: VGA connector Digital Visual Interface Composite video S Video Component video …   Wikipedia

  • Video game music — Part of a series on …   Wikipedia

  • Video Toaster — The NewTek Video Toaster is a combination of hardware and software for the editing and production of standard definition and high definition video in NTSC, PAL, and resolution independent formats on Commodore Amiga computers and subsequently on… …   Wikipedia

  • Sound card — A Sound Blaster Live! Value card, a typical (circa 2000) PCI sound card. Connects to Motherboard via one of: PCI ISA USB IEEE 139 …   Wikipedia

  • Graphics processing unit — GPU redirects here. For other uses, see GPU (disambiguation). GeForce 6600GT (NV43) GPU A graphics processing unit or GPU (also occasionally called visual processing unit or VPU) is a specialized circuit designed to rapidly manipulate and alter… …   Wikipedia

  • TV tuner card — Hauppauge WinTV TV tuner card with the popular Bt878 chip A TV tuner card is a kind of television tuner that allows television signals to be received by a computer. Most TV tuners also function as video capture cards, allowing them to record… …   Wikipedia

  • Comparison of Nvidia graphics processing units — For information on AMD (previously ATI) graphics processing units, see Comparison of AMD graphics processing units. This page contains general information about Nvidia s GPUs and videocards based on official Nvidia specifications. Contents 1… …   Wikipedia

  • Comparison of AMD graphics processing units — For information on Nvidia graphics processing units, see Comparison of Nvidia graphics processing units. This page contains general information about the GPUs and video cards by Advanced Micro Devices (AMD), including those by ATI Technologies… …   Wikipedia

  • Supreme Commander (video game) — This article is about the video game. For the commander of a nation s military forces, see Commander in chief. Supreme Commander Developer(s) Gas Powered Games Hellbent Games (X360) …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”