Originally Posted by Pyromonkey83
This does some fancy stuff (I have no idea what it does technologically speaking) that causes your videos to be optimized for web streaming.
Just for the sake of understanding, the optimization is the moving of a small packet of information, called the moov atom, from the end of the file to the beginning of file. The moov atom contains playback information. When it's at the end, your player will not know how to play the file until it reads the atom. Moving it to the beginning, allows the player to have that information before the file is entirely loaded, thus speeding up the process. Of course, there is a reason the moov atom is normally placed at the end. If you modify the information (metadata), you only need to re-write moov atom. If it is placed at the beginning, you have to re-write the whole file (everything is shifted) which is a little slower. So far, though, I have found the re-write time of an optimized file to be very tolerable. Schools over.
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