Video cards are also called video capture cards. According to their use, they can be divided into broadcast video capture cards, professional video capture cards, and civil video capture cards. The difference between them is mainly the different image indicators collected. The maximum acquisition resolution of a broadcast video capture card is generally 768X576 (root mean square) PAL, or 720X576 (CCIR-601) PAL 25 frames per second, or 640X480/720X480 NTSC 30 frames per second minimum compression Than usually 4:1. This kind of product is characterized by high resolution of the captured image and high video signal to noise ratio. The disadvantage is that the video file is huge, and the data amount per minute is at least 200 MB. Broadcast-level analog signal acquisition cards have component input/output interfaces for connecting to BetaCam cameras/recorders. These devices are the highest-end video capture cards used by television stations to produce programs. The level of professional video capture card is slightly lower than the performance of broadcast video capture card. The resolution is the same, but the compression ratio is slightly larger. The minimum compression ratio is generally within 6:1, and the input/output interface is AV. Composite terminals and S-terminals, these products are suitable for advertising companies, multimedia companies to produce programs and multimedia software. The dynamic resolution of the civilian-level video capture card is generally 384X288 maximum, PAL 25 frames per second. In addition, there is a special type of video capture card that is special. This is the VCD production card. It should be regarded as a professional grade in terms of usage. In terms of image indicators, he can only count as a civil-grade product.