Ethereal-users: Re: [Ethereal-users] RTP Stream Analysis

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From: "Lars Ruoff" <Lars.Ruoff@xxxxxxxxxx>
Date: Tue, 9 Nov 2004 16:52:06 +0100
...and in 0.10.7 the output is even different! :-)

The revision history of all this is something like this:
- somewhere before 0.10.3 jitter was calculated wrongly, which was fixed for
0.10.3.
 From then on, jitter calculation used a default clock rate of 8000Hz for
all payload types.
- 0.10.7 incorporates a fix which defines the RTP clock rate values for
known static payload types, and which defaults to a clock rate of 1Hz for
unknown payload type (which is the case in your example capture)

Thus, the output of 0.10.3 should be conforming with what i said about the
jitter definition when assuming a default clock rate of 8000Hz, while the
output of 0.10.7 is conforming when assuming a clock rate of 1Hz (gives
monstreous jitter!).
If someone has another idea on how unknown payloads should be handled, let
us know.

Lars

BTW: When has the delay and jitter column output format been changed?
I prefer the fixed point representation like it was before.