Agreed Tshark will be helpful and more easy to implement wireshark filters. My understanding was Tshark is used with Java. Identical to Tcpdump for Perl. Definitely give a try to use Tshark in Perl. There's a Tshark PM too. I've been parsing input pcap file that don't contain mss option. here is the output with mss option.

Thank you

===output===

$VAR1 = {
          'sack' => 2,
          'mss' => 1460,
          'ws' => 8
        };
[download]

===output===