extracting tcpdump data

["Rusma Mulyadi" <rmulyadi () email arizona edu>]

I am looking for tools/ scripts that can be use to preprocess tcpdump
file.  
For the tcp packets, I wanna be able to extract the connection level
information about the network traffic (e.g. start time, duration,
participating hosts and ports, etc.) for further processing using data
mining tool.
Any comments and inputs are very welcome.
Thanks,
Rusma