tcpdump -w - | curl -u FTPUSER:FTPPASS ftp://ftpserver/where/ever/dump.pcap -T -
For wireshark format:
tcpdump -s 65535 -w - | curl -u FTPUSER:FTPPASS ftp://ftpserver/where/ever/dump.pcap -T -
ssh user@host "tcpdump -i tap0 -w -" | wireshark -k -i -
https://www.wireshark.org/docs/wsug_html_chunked/AppToolstcpdump.html
http://unix.stackexchange.com/questions/28188/how-to-upload-tcpdumps-in-realtime-to-ftp