Correct PCR Jitter in mpeg2 ts muxer

the job is resolving a PCR jitter in mepg2 transport stream muxer.? the application uses ffmpeg project under linux, to multiplex a few? input mpeg2 transport streams into one output transport stream.? the output stream represent multiple streams (MPTS) and is constant bitrate (CBR). the problem: each input stream carry with in an in-band time clock called PCR. when multiplexing a few input transport stream the input time-stamp packets shift in time. and therefore create a time jitter. the mission is to fix those jitters by re-stamping the input PCR packets to compensate the time shift and eliminate the jitter.? solution:? detecting input PCR packets calculating there time by counting the input stream bits and bps routing the input packets to the output stream calculating the output time by counting the output stream bits and bps re-stamping the output PCR packets to compensate the time shift? validation will be done by a video analyzer (e.g mprobe). thanks