All about MPG files

MPG is a file format used to compress movies. It was developed by Leonardo Chiariglione and Hiroshi Yasuda in the 80s to achieve better compression of films. The forerunner was mpeg-1, which achieved only a low output quality with a limited data rate of only up to 1.5 Mbit / s. Successors like MPEG-4 offer the possibility of higher quality results thanks to modern compression processes. In 1994, MPEG-2 was the successor to MPEG-1. In addition to compressing video files, MPEG-2 also enables audio encoding and compression. The ten times higher data rate of up to 15 Mbit / s enables significantly better results. In the ideal case, the data rate is up to 50 Mbit / s – for example, if the color resolution should also be compressed.

MPEG: Motion Picture Expert Group

MPEG stands for "Motion Picture Expert Group". It is an international file standard for compressing video and audio files and then decompressing them when the corresponding file is played. MPG is now being used across the board to convert files of all kinds into a smaller format and thereby facilitate playback and transfer to storage media. Related standards are MPEG-4 and mp3, which are used for video and music files.

Compression over various optimization phases

MPG uses a special form of compression in which various optimization phases are used in order to convert the original images into coded images depending on the image information. These encoded images require less storage space without significantly losing quality. At medium compression rates, which range from 1: 100 to 1: 800, the computational effort is comparatively low. This makes it possible to save videos in very small file formats, which means that they can be transferred or saved easily and without any further steps.

This is how MPEG works

With compression, the individual fragments of a file are saved separately from one another. Instead of digitizing the entire file, only individual parts of a film are saved. Different types of images are used for this – the I, P, B and D images, which are only partially compressed and each correspond to a still image. They serve as fixed points for accessing the film sequences. This procedure enables faster data retrieval. The P-pictures (predictive coded picture) use the file information of the previous I- and P-pictures to achieve a higher compression. The B-pictures (bidirectional coded picture) are the sequences with the greatest compression. They are created using the previous I and P pictures. The D pictures (DC coded picture) are used to compress individual color blocks in the 8×8 format.

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