![]() Mov files are H.264 and very often you will find that files you see that are marked as MPEG4 are actually H.264. It is a common misconception that H.264 is a format with only a single form. That is how it manages to achieve such small video file sizes. It will display a little of the total picture from the information in the file but mainly it will go to other pictures (before and after the current one) to find the rest of the information it needs to show the complete picture. When the file is played back the decoder in the playback device will hit the picture in the example above. Once it has done that it now “knows” what is the same and what is different between one picture and the next and simply put, it throws out everything that is the same and only keeps what is different. H.264 inspects the before and after pictures down to the level of one quarter of a pixel for this motion search resulting in quite amazing quality. It detects the changes between the before and after pictures as compared to the current picture and carries out what is called “motion estimation.” That’s just a fancy was of saying it makes a calculated guess as to what the changes are. The H.264 encoder is able to divide each picture recorded into a set of blocks, it then searches the pictures in the video stream before and after the picture being encoded. The H.264 standard reduces the amount of information required to reproduce a video… How Does it Work? It can run across many different types of platform and is suited to high definition production. H.264 provides very powerful compression technology that delivers superior video at a low bit rate. It is most likely that the current MPEG2 for DVD and DV avi video files types for camcorders will be phased out in favor of H.264 or something similar. To be blunt H.264 is probably the future. Both MPEG2 and MPEG4 are a set of rules or standards that dictate the manner in which particular video files are encoded and rendered (played back). ![]() It is important to note that terms like MPEG2 and MPEG4 are not codecs in themselves although the terms are used in this context quite often. As is usually the case the popular becomes more popular because… well… it’s popular! So as a result most modern DVD players and devices are now compatible with the DivX standard.ĭivX is based on the H.264 standard which in itself is an MPEG4 variant. ![]() The DivX codec is currently the most popular MPEG-4 based codec because of its quality, speed and efficiency. The format was developed to enable users to create very high quality video with very small files sizes. ![]() DivX is the name of a specific video compression codec (compression-decompression) developed by DivX, Inc. ![]()
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