Video and video capture card

Video: visual or image information. Convert moving or still images into electrical signals. In computer video, the red, green, blue and sync signals are separate electrical signals. In VHS video, the red, green, blue, and sync signals are a single electrical signal. In S-VHS video, the red, green, blue and sync signals are separated.

Video capture card : The video capture card needs to occupy an expansion slot of the computer, through which the video signal is captured by the playback device into the computer. Generally speaking, the video capture card comes with a docking station, which provides various sockets for connecting playback devices. Digital video signals occupy a lot of hard disk space, so many capture cards compress video signals while collecting video signals to avoid possible bottlenecks in the CPU, data bridge (connecting capture card and computer), and writing to the hard disk . The so-called bottleneck refers to when any of the above links are too late to process the input signal. The most direct consequence is generally the loss of part of the video content (frame). When the video stream is captured into the computer, it will be stored as a video file. You can specify a frame rate through your video capture software, such as 15 frames, the video capture software will save the input video signal to the buffer at a rate of 15 still pictures per second through the capture card, and then save the video file Write to the hard disk. The hardest place is the hard disk. Therefore, it is very important to install a hard disk with continuous throughput as high as possible. It is important to know that the data to be processed continuously by the hard disk is even larger than you think. Those who make broadcast-grade film and television works generally use disk arrays-through the cooperation of several hard drives to obtain maximum throughput.