How to convert .pcap to text format for twamp without using tshark

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Are you asking for a dissector for twamp protocol, or are there issues with twamp dissection?

Assuming twamp refers to Two-Way Active Measurement Protocol, then a dissector has been built in to Wireshark since version 2.6, so make sure you're using that version, or newer.

If your issue is with dissection of twamp can you share a capture file that illustrates the issue?

Yes twamp is exactly that. In the capture file, need to verify dscp value (that's why want in a key value pair display) . In the text format that I have got using tshark , doesn't parse such information.

So can you share a capture file so that we can help you get the tshark output you want, probably using -T fields -e xxx?

dscp doesn't seem to be a twamp field, so are you referring to the IP DSCP field?

Text from capture:

Frame 7: 
    Source Port: 62862
    Destination Port: 862
    [Stream index: 0]
     ...
TwoWay Active Measurement Control Protocol
    Control Command: Request-TW-Session (5)
    IP Version: 4
    .....
    Timeout: -2085978496.000000000 seconds
    Type-P Descriptor: 0x2e000000 (DSCP: 771751936)

this is the captured file. have to verify Type-P Descriptor: 0x2e000000. So is there a command to display in key value pair on CLI this .pcap file