What do you mean by capture Card?Are you doing programming?I think Capture card is responsible for properly inputting and processing the audio and video signals, and then converting them into a digital stream of bits. For this reason, the video capture card is the most important link in the chain. A low-quality or outdated capture card can greatly reduce the quality of the video. After the video has been converted to digital form, the data can be stored, transferred, and copied without affecting quality.