Capture card or digitizing card is a device that is capable of digitizing video signals through certain interfaces (e.g., HDMI, USB, S-Video, or other analog input) and storing the results on a computer using various compression algorithms (typically MPEG1, MPEG2 or MPEG4). Modern capture cards often use several algorithms for video compression at once. Such devices make it possible not only to convert analog video signals to digital, but vice versa too.
If the PC does not have an HDMI-input (do not confuse with HDMI-output), it is necessary to connect the camera to a capture card in order to convert analog signal into digital (or vice versa). It will serve as an interface between the devices. To digitize an image, a capture card has to be connected both to a computer and a camera in order to transfer the signal. The result will be stored on a computer.
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