Compression is the process of reducing the amount of data in a video file. This makes the uploading and downloading processes for your video much quicker. While it does take time to compress your video, we recommend it because of the time you’ll save late and leave you with more storage for more videos!
Video compression can make video files far smaller with little perceptible loss in quality. For example, DVDs use a video coding standard called MPEG-2 that makes the movie 15 to 30 times smaller while still producing a picture quality that is generally considered high quality for standard-definition video.
Compressed video can be transmitted more economically over a smaller carrier. Digital video requires high data rates - the better the picture, the more data is ordinarily needed. This means powerful hardware, and lots of bandwidth when video is transmitted. However much of the data in video is not necessary for achieving good perceptual quality, e.g., because it can be easily predicted - for example, successive frames in a movie rarely change much from one to the next - this makes data compression work well with video.
One of the most robust techniques for compressing video is interframe compression. This works by comparing each frame in the video with the previous one. If the frame contains areas where nothing has moved, the system simply issues a short command that copies that part of the previous frame, bit-for-bit, into the next one.
MPEG is an another tecnique which is a set of standards established established for the compression of digital video and audio data. It is the universal standard for digital terrestrial, cable and satellite TV, DVDs and digital video recorder. MPEG uses lossy compression within each frame similar to JPEG, which means pixels from the original images are permanently discarded.