title: how to extract data from pcap file
body: <p>I have a few pcap files, I can see the memcache protocol in wireshark and its corresponding data, but when I use tshark to batch export data, it only shows one character(0x0b), why? </p>
  
  <p>the command I use: tshark -Y "memcache contains set" -r input.pcap -T fields -e memcache.value 
  Thank you! 
  BTW, memcache key works fine. And I can't share the files here as they are confidential. </p>