Video Card
The video card needs a computer expansion slot via which video signal is transmitted into computer. Generally speaking, video card also provides an expansion slot to connect video playing equipments with various adapters. Digital signal occupies a lot of space, so most video cards not only captures video signal but also compresses signal at the same time in order to avoid Bottleneck Effect on CPU, data bridge (connecting capture card and computer) as well as HDD read-in process. Once video stream captured into computer, it is saved as video file. We can adopt video software and set a frame speed, such as 15f, thus the video software will save signal with 15f/s to Cache Memory, read video file into HDD.
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