pcap 2 mpeg2 (a converter ?)

Hi,

I would like to implement a program that takes as input a file .pcap and 
provides as output a MPEG2 file. It means that I want to read a .pcap file, 
extract all packets that are corresponding to MPEG data and remove all 
specific .pcap file data.

I would like to know if someone already worked on this kind of subject or if 
someone has an idea about the way to do this.

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