Introduce jitter to a pcap file
Given a pcap file, adjust the timestamps to approach a given jitter amount
Install scapy (sudo apt-get install python-scapy), open it (sudo scapy), then copy/paste the contents of scapyJitterfy.py into the scapy terminal.
Now you can use the script like this:
add_jitter('<inputfilename>.pcap', '<outputfilename>.pcap', <avg_jitter_in_seconds>)