MPEG2 I, P, B frames

Hello,

I use VLC to stream MPEG2 video files in MPEG TS container through UDP over LAN. I have captured packets with Wireshark and I want to ask if there is any way to identify which frames are I, P, B?

Pcap files link: http://www.sendspace.com/filegroup/cuJsOSzuqIrxbGJOQolg1g