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[AVT] Synchronization question abt RFC 2250

Dear AVT experts,
 
A question came across to me when I go through RFC 2250, would some of you can help me?
 
According to RFC 3550, RTP timestamp is defined as sample time of each unit. It also reflacts the presentation time. 
But for some of payload type (e.g. mpeg1/mpeg2 vedio, RFC2250 ),  RTP timestamp is not the presentation timestamp any more.
RFC 2250, Page 4:
The RTP timestamp will not be passed to the MPEG
   decoder.  This use of the timestamp is somewhat different than
   normally is the case in RTP, in that it is not considered to be the
   media display or presentation timestamp. The primary purposes of the
   RTP timestamp will be to estimate and reduce any network-induced
   jitter and to synchronize relative time drift between the transmitter
   and receiver.
So my question is that, how to synchronize a mpeg1/mpeg2 video RTP stream (according to RFC 2250) with a normal RTP stream?
Mechanism provided by RTP protocol may not help in this case.
 
Best regards,
Roy
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