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MOOV Atom Position Detector
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MOOV Atom Location
The MP4 format consists of atoms (packets of data), that are arranged in a particular order. The MOOV atom acts like a table of contents for the video.
Why do we test it?
In order for the video to start playing, the MOOV atom has to be read first. If that atom is located at the end of the file, the whole file has to be downloaded before playback can begin. For the video to start playing virtually immediately, the MOOV atom has to be placed at the beginning of the file.