title: MPEG2-TS : PCR and PTS
body: <p>In mpegts, is there any relation between PCR and PTS? I mean, why should we provide PCR and what value should be assigned as PCR?
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  In some posts I saw that PCR can be calculated from PTS, how? 
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  Well, it is clear that, PTS must be incremental, but what about PCR? Should it also be incremental?</p>