Video capture card, also called video capture card, can digitize video information and store or play the digitized information. Most video capture cards can collect video information and record sound at the same time, and can also ensure synchronous storage and synchronous playback. In addition, many video capture cards also provide hardware compression function, and the acquisition speed is fast, which can realize full-screen video acquisition of 30 frames per second. According to the different compression formats, some video files compressed by this kind of acquisition card need corresponding decompression hardware to realize when playing back. These video capture cards are sometimes called compression cards. Using video capture card, we can convert the original video tape into digital information that the computer can recognize, and then make it into VCD. You can also get video information directly from the video camera and camera, so as to edit and make your own video programs. The video acquisition card is to input the video data or mixed data of video and audio output from analog cameras, video recorders, LD video players and televisions into the computer, convert them into digital data that can be recognized by the computer, and store them in the computer to become editable video data files.

According to the purpose, it can be divided into broadcast video capture card, professional video capture card and civil video capture card. Their grades are mainly due to the different quality of the collected images.