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Videos can be saved in many f= ormats. Formats are actually rules prescribing how to store digital data fo= r videos. For example, formats specify the maximum resolution and color dep= th, the aspect ratio, or the number of images per second.
Application programs, such as player,= must read out these formats to play out videos properly. For this purpose,= codecs are used. Codecs know the format rules, and can encode or decode vi= deo files according to these rules. They form the interface between the vid= eo format and the application program. Codecs compress and also decompress = usually video, audio or images in a desired format: when you play a v= ideo codecs ensure that certain information, such as duration, resolution o= r aspect ratio is correctly implemented.
Analogous to the various video format= s, there are a variety of codecs available. The playback program must the f= ind the matching codec from a list of existing codecs to reproduce the corr= esponding video file. While the player determines parameters such as positi= on and size of the video window, the video resolution can be adjusted durin= g playback by a codec.