techniques of audio/video streaming/playback

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http://stackoverflow.com – What are track preloading and stream caching? What other techniques for audio/video streaming/playback for increasing performance/ improving user usability are ? EDIT: Google didn't help me Maybe someone has practical advices EXAMPLE: Use two files to cache previous/next tracks in a playback queue P.S: Why it's not a real question? I am asking for some streaming/playback techniques. (HowTos)