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I have a video streamer (VLC) which is using RTP to stream video to a client. I have captured the packet trace from both the sender and the receiver side using tcpdump separately.

The streaming produces UDP packets. It is possible that some packets are missing/out of order on the receiver side. Assume that the clocks on both the machines are synchronized.

My task is to find the delay between the packets

Q : Is there any tool which can compare both the dump files and generate UDP statistics, specifically delay?

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  • Any help? Anyone?
    – xavier666
    Commented Jan 23, 2017 at 11:53

3 Answers 3

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Wireshark offers support for RTP Analysis.

See also these RTP-related Wireshark wiki pages: RTP, RTP Statistics.

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I had to do it manually. I wrote a python script which

  • extracts the packet from each pcap file (sender and receiver)
  • compares their payload
  • if it's a match and timestamps are causally correct, then delay is calculated
  • If a match is not found over a certain window size (I kept it as 100), the packet is assumed to be lost and we move to the next packet

I did this over the entire pcap file and made an average over all the delays. If somebody wants it, I can share the code.

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I would like to know if there is any change to filtering RTP headers in TCPDUMP. When I have some files from TCPDUMP with a space bigger than my memory RAM can support, I can get delay, packet loss, and jitter.

Could you please provide some guidelines to do this to finish my report from my master's degree?

Thanks

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    Commented Apr 22, 2023 at 10:47
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