By PURPLELEC | 20 June 2024 | 0 Comments
What are the video capture cards classified by purpose?
video capture cards collect video signals into computers and save them on hard disks in the form of data files. It is an indispensable hardware device for video processing. Through it, we can transfer the video signals shot by the camera from the video tape to the computer, and use relevant video editing software to perform post-editing processing on the digitized video signals.
According to their uses, they can be divided into broadcast-level video capture cards, professional-level video capture cards, and civilian-level video capture cards. Their differences are mainly different in the image indicators they capture.
The highest capture resolution of broadcast-level video capture cards is generally 768X576 (root mean square value) PAL system, or 720X576 (CCIR-601 value) PAL system 25 frames per second, or 640X480/720X480 NTSC system 30 frames per second. The minimum compression ratio is generally within 4:1. The characteristics of this type of product are high image resolution and high video signal-to-noise ratio. The disadvantage is that the video file is huge, with a data volume of at least 200MB per minute. Broadcast-grade analog signal capture cards all have component input and output interfaces for connecting BetaCam cameras/recorders. This type of equipment is the most advanced among video capture cards and is used by TV stations to produce programs.
The performance of professional-grade video capture cards is slightly lower than that of broadcast-grade video capture cards. The resolution of the two is the same, but the compression ratio is slightly larger. The minimum compression ratio is generally within 6:1. The input and output interfaces are AV composite terminals and S terminals. This type of product is suitable for advertising companies and multimedia companies to produce programs and multimedia software.
The dynamic resolution of civilian-grade video capture cards is generally up to 384X288, and the PAL system is 25 frames per second. In addition, there is a special type of video capture card, which is the VCD production card. From the perspective of use, it should be considered professional-grade, but from the perspective of image indicators, it can only be considered a civilian-grade product.
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