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MPEG user data
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{{Refimprove|date=January 2012}} The '''[[MPEG]] user data''' feature provides a means to inject application-specific data into an MPEG [[elementary stream]]. User data can be inserted on three different levels: *The sequence level *The [[group of pictures]] (GOP) level *The picture data level Applications that process MPEG data do not need to be able to understand data encapsulated in this way, but should be able to preserve it. Examples of information embedded in MPEG streams as user data are: *[[Aspect ratio (image)|Aspect ratio]] information *"Hidden" information per the [[Active Format Description]] specification *[[Closed captions|Closed captioning]] per the [[EIA-708]] standard <!-- www.nds.com uses user data for their captions, but it looks proprietary --> == External links == *[http://www.atsc.org/ ATSC] *[http://www.dvb.org/ DVB] <!-- * [http://www.nds.com/ NDS] --> [[Category:ATSC]] [[Category:Digital television]] [[Category:MPEG]] {{tech-stub}}
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