Statistics->RTP->Stream Analysis,
the “RTP Stream Analysis” windows appear. Then click in “Graph”
button.
-----Original Message-----
From: Luis Ontanon
[mailto:luis_ontanon@xxxxxxxx]
Sent: Friday,
September 17, 2004 10:41 AM
To: alejandrovaquero@xxxxxxxxx
Subject: Re: [Ethereal-dev] RTP
Graph analysis
How
do I show the graph?
I can’t find a button or menu to get the graph!
Luis
From: "Alejandro Vaquero"
<alejandrovaquero@xxxxxxxxx>
Reply-To: Ethereal development
<ethereal-dev@xxxxxxxxxxxx>
Date: Mon, 6 Sep 2004 16:20:25
-0600
To: <ethereal-dev@xxxxxxxxxxxx>
Subject: [Ethereal-dev] RTP Graph
analysis
Hi All,
I made the
following enhancements to the RTP analysis tool (rtp_analysis.c):
1) Added a graphic analysis of RTP packets (see RTP_graph_analysis2.jpg for a
screenshot). This graph displays the forward and reverse RTP packets over the
time in the x axis, and the “jitter” and “difference”
in the y axis. Where:
- jitter: is
the mean deviation of the difference in packet spacing at the receiver compared
to the sender (as per RTP RFC1889). Basically this is the “average
jitter”.
- difference:
is the time difference in two consecutive packets at the receiver compared to
the sender. This is basically the “jitter” between two consecutive
packets (the time difference when the packet actually arrived and when it
should theory arrive). This is the value that is more important to understand
when there are voice problems. For example, if a device has a “jitter
buffer” of 100ms, and you see that the “difference” is 150ms,
that means there are a couple of packets that the device will drop because it
doesn’t feet in his “jitter buffer”.
This graph
interface is based on io_stat.c and tested in Windows 2000 using GTK 1 and 2.
2) The graphic also display an “x” at the bottom of the x-axis if
there was a “wrong sequence number” between two consecutives
packets. This usually means a packet lost, or out of order packets. And will
display an “m” for packets with the RTP “Mark set”.
This means the end of a silence period.
3) Fixed a bug where the reverse RTP packets were not displayed in the
“RTP analysis tool” when using “Stream Analysis…”
menu option.
4) Display the “Delay” and “Jitter” column in
“ms” instead of “sec”. And added the percentage of
packet lost to the statistic.
Attached is a
screenshot and the “diff” of rtp_analysis.c.
Comments/suggestions
are very welcome.
Thanks and Regards
Alejandro
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