Compressing video is to make the video file smaller by sacrificing the size, sound or image quality of the video itself.

If individual data is lost in the process of compression (lossy compression), it is best to ignore these data. Lossy compression is widely used in animation, sound and image files, and the typical examples are mpeg, mp3 and jpg.

Extended data

Uncompressed video is usually impractical. In the digital image monitoring system, a large amount of video data needs to be processed, so image compression and encoding and decoding are very important. At present, there are many compression methods used in digital monitoring system. At present, JPEG (for single image), H .26 1(P ×64) and MPEG (for video and audio) are widely used.

For lossy compression, the original file will not be restored after file compression. The compressor will reinterpret the original file. Therefore, if you need to completely reproduce the original content (such as software applications and databases), you should not use this form of compression.