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MPEG transport stream
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===Null packets=== Some transmission schemes, such as those in [[ATSC]] and [[DVB]], impose strict constant bitrate requirements on the transport stream. In order to ensure that the stream maintains a constant bitrate, a multiplexer may need to insert some additional packets. The PID 0x1FFF is reserved for this purpose. The null packets have a payload that is filled with 0xFF, and the receiver is expected to ignore its contents.<ref>{{citation |url=http://www.img.lx.it.pt/~fp/cav/Additional_material/MPEG2_overview.pdf |title=A Guide to MPEG Fundamentals and Protocol Analysis |publisher=Tektronix |access-date=2020-04-23 |page=37}}</ref>
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