As noted in the comments to the question, to output the ip addresses for frames in a capture file in csv format use something like:
tshark -r -t fields -e ip.addr
See the tshark help for more information about options to set the separator and quoting characters in the csv output.
Field names can be determined by using Wireshark to examine the capture file and selecting a particular field in the details pane. The field name will be then shown in the status line at the bottom of the Wireshark window.
