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Video capture

 

Video capture

Converting analog video signals, such as those generated by a video camera, into a digital format and then storing the digital video on a computer's  mass storage device. Video capture from analog devices requires a special video capture card that converts the analog signals into digital form and compresses the data. There are also digital video devices that can capture images and transfer them to a computer via a standard serial or parallel interface.

Capturing analog video such as NTSC or PAL television broacasts or videotape requires a special capture device capable of sampling the video to digitize it. The video is then encoded to a digital format by either hardware or software. The digitized video is then saved to a file. The hardware may be in the form of a capture card that plugs into a computer's expansion bus or an external box that connects to a computer via FireWire or USB. In some cases it may even be a standalone DVR or DVD recorder that doesn't require a computer at all. In addition to video, there is generally audio that must be captured and muxed with the video to create the final file. 

Video playback frequently needs an extra extension card and a intermediary software download.

Video Capture Card for your PDA and laptop allowing applications and uses of portable and mobile vision systems to become a reality. The frame grabber supports a standard analog NTSC or PAL interfaces, and provides the functionality, performance and versatility required by today’s most demanding vision systems.

Mac OS X

There's a freeware screen capture for blip.tv users (requires a free account)

http://www.blip.tv blip.tv

Windows

Freeware software used for video capture:


Linux

Video screen capture tools include