Have any of the telco voip people tested this patch yet?
If no one objects to it I will test it and check it in in a few days.
----- Original Message -----
From: Alejandro Vaquero <alejandrovaquero@xxxxxxxxx>
Date: Mon, 6 Sep 2004 16:20:25 -0600
Subject: [Ethereal-dev] RTP Graph analysis
To: ethereal-dev@xxxxxxxxxxxx
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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