Video Capture Devices - The Need For, The Types Of, And What You Can Do With Them.
Video capture is the process by which analog video is converted to the digital format. A special piece of hardware known as the video capture card or the video processing expansion card is used for video capture. Video capture devices are available in both external and internal models. These are separately described below.
External video capture cards
External video capture cards interact with a computer system through the use of any one out of the Universal Serial Bus 2.0 Standard port, IEEE 1394a (FireWire 400) standard port, IEEE 1394b (FireWire 800) port, or the IEEE 1394c (FireWire S800T) port.
Internal video capture cards Internal video capture cards interact with the target computer system using the PCI (Peripheral Component Interconnect) slot, AGP (Accelerated Graphics Port), or the new PCI Express standard slot. Video capture cards come with their drivers for various operating systems such as Windows, Mac OS X, and in some cases, even Linux. The video capture card driver interacts with the Hardware Abstraction Layer of the operating system so that the operating system can manage and control the video capture card. The drivers for video capture cards also come with certain configuration utilities, which allow a user to modify the settings and parameters of the video capture card. Video capture cards have an ability to get input signals of analog video through the use of an S-Video port, a composite video port, and in some cases in which there is an on-board tuner even a Radio Frequency modulated video port. Apart from this, there are a number of newer advanced video capture cards, which can interact with a computer system through the use of modern digital standard ports such as the Serial Digital Interface or high definition content connection formats such as HDMI. These video capture cards, however, do still retain the ability to capture in standard definition mode, as high definition broadcasts are not very popular as on date. It should be noted that both PCI and PCI Express based video capture cards are exclusively meant for this purpose. Those which come with the AGP interface also have a graphics card subsystem on-board. It must also be noted that video capture cards are different from video editing cards. Dedicated video capture cards do not have any extra processing abilities, apart from the fact that they can convert an analog video signal into a digital video signal. Audio processing subsystems are built on-board in most cases, but in some cases, audio can be simultaneously captured from more than one source. Why would you need a video capture card? Video capture cards, as has been mentioned earlier, are used to capture analog video and convert it into digital format for editing or storage and archival purposes. Video capture cards can be used to digitize the video from VHS tapes and Hi8 tapes. Similarly, video capture cards are also useful to record television programs, which the user can view at his convenience. You may watch an NBA game, which you would normally miss live on TV, because of a meeting that you have scheduled with a client from overseas.
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