What is video compression?
In visual recording and transmission, video compression video technology used to reduce the amount of data in the video file, to reduce the amount of storage space or the bandwidth it requires. It is common in online media and when broadcasting. Video compression works on the same theoretical basis as other types of file compression and even cryptography, which means that one piece of data can be used and reused to represent multiple data. Compression technology is therefore trying to achieve an optimal compromise that compensates for data reduction. From a technical point of view, most types of compression video work by comparing a single video frame with framework immediately before and after and after it and storing only pieces of image that are significantly different. Therefore, the compression level can be adjusted to expand how much compression software is looking for. Compression works best when only a small part of the video changes at once. Fast moving objects and events such as explosions are very difficult to compressé thanks to their constantly changing composition.
video compression is not a flawless process. In most ways of video compression, the higher the level of compression, the longer it may take before the video player's hardware decodes data. This may result in visual defects. One of them and the common pitfalls of excessive compression is known as artifacting , a phenomenon where small static pieces from previous video frames remain on the screen above the moving picture. Artifacting is particularly common in video files for Internet and mobile devices, where visual quality is a secondary priority behind the file size.
In the media as a DVD-Video ™ (DVD) in which the main goal is optimal visual quality, the video can still be very compressed and remain adequately sharp. New technologies such as Blu-ray ™ that have much larger capacities than DVDs require less compression and therefore can introduceVideo in even higher quality. Advances in storage and transmission technologies continue to reduce the need for extreme compression levels and shift the emphasis on providing higher quality.
In addition to traditional or loss , compression is also known as lossless . Loss loss of compression, as its name suggests, compresses data without actually deleting any information from the file. It is a limited range and cannot compress data to the same degree as the loss technique, but satisfies the needs of some applications that retain all the data from the original file.