Wireshark-bugs: [Wireshark-bugs] [Bug 7935] New: Wrong Timestamps in RTP Player-Decode

Date: Mon, 29 Oct 2012 15:07:26 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7935

           Summary: Wrong Timestamps in RTP Player-Decode
           Product: Wireshark
           Version: 1.8.2
          Platform: x86-64
        OS/Version: Windows 7
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: bfaust@xxxxxxxxxx


Created attachment 9447
  --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=9447
pcap of 338 rtp packets from a VoIP capture

Build Information:
Version 1.8.2 (SVN Rev 44520 from /trunk-1.8)

Copyright 1998-2012 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 (64-bit) with GTK+ 2.24.10, with Cairo 1.10.2, with Pango 1.30.0, with
GLib 2.32.2, with WinPcap (4_1_2), with libz 1.2.5, without POSIX capabilities,
with SMI 0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS
2.12.18, with Gcrypt 1.4.6, without Kerberos, with GeoIP, with PortAudio
V19-devel (built Aug 15 2012), with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, 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 2.12.18, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 10.0 build 40219

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I attach a VoIP capture restricted to the RTP packets one way. Codec used is
G711. All sequence numbers increase steadily by 1, and all timestamps increase
steadily by 160.
When running the Telephony/RTP/Stream Analysis, then Player, then Decode (with
50 msec Jitter Buffer), Wireshark finds 13 Wrong Timestamps.
It does not seem right.

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