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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:<br />
*The sequence level<br />
*The [[group of pictures]] (GOP) level<br />
*The picture data level<br />
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.<br />
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Examples of information embedded in MPEG streams as user data are:<br />
*[[Aspect ratio (image)|Aspect ratio]] information<br />
*"Hidden" information per the [[Active Format Description]] specification<br />
*[[Closed captions|Closed captioning]] per the [[EIA-708]] standard<br />
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<!-- www.nds.com uses user data for their captions, but it looks proprietary --><br />
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== External links ==<br />
*[https://www.atsc.org/ ATSC]<br />
*[https://www.dvb.org/ DVB]<br />
<!-- * [http://www.nds.com/ NDS] --><br />
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[[Category:ATSC]]<br />
[[Category:Digital television]]<br />
[[Category:MPEG]]<br />
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