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The
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MP4


abbreviation for

MPEG-4 Part 14: software created by the Motion Picture Experts Group for transmitting data streams to a receiving device in real time
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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