https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5958
Summary: RTP stream analysis shows incorrect number of sequence
errors
Product: Wireshark
Version: 1.4.6
Platform: x86
OS/Version: Windows XP
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: ser.fejd@xxxxxxxxx
Created an attachment (id=6406)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=6406)
Screenshot of analysis
Build Information:
Version 1.4.6 (SVN Rev 36706 from /trunk-1.4)
Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled (32-bit) with GTK+ 2.16.6, with GLib 2.22.4, with WinPcap (version
unknown), with libz 1.2.3, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3,
with
Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Apr
18 2011), with AirPcap.
Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.2
(packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 21022
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
When analyzing a log from a long RTSP streaming run on a bad network with a lot
of packet loss, it looks as if the sequence error count never recovers after
the sequence number reaches the maximum sequence number and starts over. In the
case shown in the attachment, the reporting of sequence errors looks alright up
until sequence 61. After that, sequence 62 arrives but Wireshark does not
recognize that as the correct sequence number. All packets after that are
tagged with "Wrong sequence nr.", which results in a large sum of sequence
errors.
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