You’re not sure what data your packet capture is really containing and it is too big to be opened with Wireshark or other tools? Visualize it using Squey, isolate packets or sessions worth of interest with arbitrary complexe criteria and then export it to smaller PCAP file(s).
As an example, we will load the complete MACCDC 2012 PCAP dataset composed of 17 files (~17GB) and export HTTP communications between IPs 192.