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I tried to find this in the documentation, but had no luck. I would love to dig the sources to find out, but I honestly don't have the time. I tried to google this, but either people do not get any reply (like this one or that one) or they look at the sources and the epiphany they get prevents them from sharing their newfound knowledge with the mere mortals we are (like here[3] or there[4]).

Is the meaning behind "Difference" and "Delta" in Wireshark RTP analyses and graphs too much knowledge for the world to handle, or could we get a clear answer on that?
(Also, do any of these relate to "Latency", and if not, is there a way to get the latency per packet from a capture?)

Edit: I'm using version 1.2.11.

[3] bugs.wireshark.org/bugzilla/show_bug.cgi?id=5498
[4] wireshark.org/lists/wireshark-users/201012/msg00035.html

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Quoting Jaap Keuter from the Wireshark Q&A site:

Delta is the difference between arrival of this packet vs. the arrival of the previous packet. It's all at the network layer and reflects the packet arrival at the capture interface (where it's timestamped).

Difference tries to tell us something about the relationship between packet arrival and RTP timestamps. It's the (absolute) difference of the packet arrival at the capture interface (where it's timestamped) vs. the expected time of arrival of the packet at the capture interface based on the RTP timestamp.

So, Delta is nice from a networking perspective, but for the RTP receiver the Difference is much more relavant since it influences the depth of the jitter buffer is must maintain to provide an uninterrupted playout.

(Complete answer here)

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