Hi Anders,
since this too is a recurring question, perhaps you (or someone else) could add
it to the Wiki, just under what i added last week:
http://wiki.wireshark.org/RTP_statistics (bottom).
(I'm sorry, i don't have the time right now).
br,
Lars
Anders Broman wrote:
> Hi,
> Looking at the sources there is code there to use different frequencies
> But for dynamic payload types there are two prerequisites that must be met:
> - The setup signalling must be in the traces for Wireshark to track the
> PT to the media type.
> - The media type sampling frequency must be in the table of rtp_analysis.c
>
> This types are currently specified:
> static const mimetype_and_clock mimetype_and_clock_map[] = {
> {"AMR", 8000}, /* [RFC3267] */
> {"AMR-WB", 16000}, /* [RFC3267] */
> {"EVRC", 8000}, /* [RFC3558] */
> {"EVRC0", 8000}, /* [RFC3558] */
> {"G7221", 16000}, /* [RFC3047] */
> {"G726-16", 8000}, /* [RFC3551] */
> {"G726-24", 8000}, /* [RFC3551] */
> {"G726-32", 8000}, /* [RFC3551] */
> {"G726-40", 8000}, /* [RFC3551] */
> {"G729D", 8000}, /* [RFC3551] */
> {"G729E", 8000}, /* [RFC3551] */
> {"GSM-EFR", 8000}, /* [RFC3551] */
> {"mpa-robust", 90000}, /* [RFC3119] */
> {"SMV", 8000}, /* [RFC3558] */
> {"SMV0", 8000}, /* [RFC3558] */
> {"red", 1000}, /* [RFC4102] */
> {"t140", 1000}, /* [RFC4103] */
> {"BMPEG", 90000}, /* [RFC2343],[RFC3555] */
> {"BT656", 90000}, /* [RFC2431],[RFC3555] */
> {"DV", 90000}, /* [RFC3189] */
> {"H263-1998", 90000}, /* [RFC2429],[RFC3555] */
> {"H263-2000", 90000}, /* [RFC2429],[RFC3555] */
> {"MP1S", 90000}, /* [RFC2250],[RFC3555] */
> {"MP2P", 90000}, /* [RFC2250],[RFC3555] */
> {"MP4V-ES", 90000}, /* [RFC3016] */
> {"pointer", 90000}, /* [RFC2862] */
> {"raw", 90000}, /* [RFC4175] */
> };
> Best regards
> Anders
>
>
>
> -----Ursprungligt meddelande-----
> Från: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] För [EMAIL PROTECTED]
> Skickat: den 24 februari 2007 17:45
> Till: [email protected]
> Ämne: Re: [Wireshark-users] Jitter wrong in wireshark?
>
> Hi Anders,
>
> Yes, your are right. Codecs affect jitter calculation because of the
> sampling frequency. In practice, it affects when calculating the timestamp
> to seconds. I.e: when multipling timestamp ticks to convert to seconds one
> must use the frequency sampling of the current codec. As wireshark uses
> always 0.000125 (it looks like this is not configurable), then if codec is
> not G711 calculations will be wrong.
>
> And that´s my case :(
> BR
> Juan
>
>
>
>
>
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of
>> ext Anders Broman
>> Sent: Sábado, 24 de Febrero de 2007 04:50 a.m.
>> To: 'Community support list for Wireshark'
>> Subject: Re: [Wireshark-users] Jitter wrong in wireshark?
>>
>> Hi,
>> If I understood the previous discussion correctly the RTP
>> timestamp which is based on the sampling frequency is used in
>> the calculations. If the wrong sampling frequency is used the
>> calculations will be off.
>>
>> If a dynamic PT is used (>95) it probably not G711.
>> Best regards
>> Anders
>>
>> ________________________________________
>> Från: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] För
>> [EMAIL PROTECTED]
>> Skickat: den 23 februari 2007 18:29
>> Till: [email protected]
>> Ämne: Re: [Wireshark-users] Jitter wrong in wireshark?
>>
>> Hi Anders,
>> good question. I´m not sure but I guess is codec is PCMA G711
>> 8KHz (will take a look during call setup in a couple of hours).
>>
>> However "Payload type" is 97 (0x61), and wireshark shows it as
>> "Payload type=Unknown"
>>
>> According to the formula, jitter calculation depends on
>> timestamps and arrival time differences. I don´t know how
>> codec could affect.
>>
>> BR
>> Juan
>>
>>
>> ________________________________________
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of
>> ext Anders Broman (AL/EAB)
>> Sent: Viernes, 23 de Febrero de 2007 01:05 p.m.
>> To: Community support list for Wireshark
>> Subject: SV: [Wireshark-users] Jitter wrong in wireshark?
>> Hi,
>> Which codec is used?
>> Best regards
>> Anders
>>
>> ________________________________________
>> Från: [EMAIL PROTECTED] genom
>> [EMAIL PROTECTED]
>> Skickat: fr 2007-02-23 16:53
>> Till: [email protected]
>> Ämne: [Wireshark-users] Jitter wrong in wireshark?
>> Hi All,
>> Below is a rtp analysis from a wireshark 0.99.5 capture in a
>> live network.
>> Doing by hand jitter calculation it doesn´t match. And of
>> course, if below data is real it means we are having jitter of
>> more than 1 minute !!
>> Exampe: first jitter should be 138.90/16 = 8.68125 [ms] and is showing
>> 8803,82 [ms] !!!
>> Do someone know what could be wrong or what I´m missing?
>> BR
>> Juan
>>
>> Forward Packet Sequence Delta (ms) Jitter (ms)
>> IP BW (kbps) Marker Status Date Length
>> 1 0 0.00 0.00 1.45 [ Ok ] 02/19/2007
>> 18:44:25.915 231
>> 2 1 138.90 8803.82 2.90 [ Ok ] 02/19/2007
>> 18:44:26.053 231
>> 3 2 119.59 17058.61 4.34 [ Ok ]
>> 02/19/2007
>> 18:44:26.173 231
>> 4 3 139.67 24796.21 5.79 [ Ok ]
>> 02/19/2007
>> 18:44:26.313 231
>> 5 4 180.22 32047.69 7.24 [ Ok ]
>> 02/19/2007
>> 18:44:26.493 231
>> 6 5 241.67 38842.10 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:26.735 231
>> 7 6 96.71 45220.93 10.14 [ Ok ]
>> 02/19/2007
>> 18:44:26.831 231
>> 8 7 198.41 51194.72 10.14 [ Ok ]
>> 02/19/2007 18:44:27.030 231
>> 9 8 205.78 56794.69 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:27.235 231
>> 10 9 193.62 62045.42 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:27.429 231
>> 11 10 197.77 66967.72 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:27.627 231
>> 12 11 208.31 71581.72 7.24 [ Ok ]
>> 02/19/2007
>> 18:44:27.835 231
>> 13 12 190.92 75908.43 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.026 231
>> 14 13 199.23 79964.20 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.225 231
>> 15 14 183.31 83767.48 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.409 231
>> 16 15 200.50 87331.98 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.609 231
>> 17 16 216.07 90672.73 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.825 231
>> 18 17 137.81 93809.57 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:28.963 231
>> 19 18 139.08 96750.28 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:29.102 231
>> 20 19 119.60 99508.41 10.14 [ Ok ]
>> 02/19/2007
>> 18:44:29.222 231
>> 21 20 119.59 102094.16 10.14 [ Ok ]
>> 02/19/2007
>> 18:44:29.341 231
>> 22 21 119.18 104518.33 10.14 [ Ok ]
>> 02/19/2007 18:44:29.460 231
>> 23 22 126.80 106790.51 11.58 [ Ok ]
>> 02/19/2007
>> 18:44:29.587 231
>> 24 23 112.05 108921.60 11.58 [ Ok ]
>> 02/19/2007
>> 18:44:29.699 231
>> 25 24 145.14 110917.43 11.58 [ Ok ]
>> 02/19/2007
>> 18:44:29.844 231
>> 26 25 115.57 112790.36 13.03 [ Ok ]
>> 02/19/2007 18:44:29.960 231
>> 27 26 118.57 114546.05 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.079 231
>> 28 27 139.44 116190.71 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.218 231
>> 29 28 120.40 117733.77 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.338 231
>> 30 29 118.59 119180.49 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.457 231
>> 31 30 120.00 120536.71 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.577 231
>> 32 31 120.23 121808.15 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.697 231
>> 33 32 119.60 123000.17 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.817 231
>> 34 33 118.72 124117.74 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:30.936 231
>> 35 34 119.88 125165.39 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:31.055 231
>> 36 35 146.42 126145.90 13.03 [ Ok ]
>> 02/19/2007
>> 18:44:31.202 231
>> 37 36 57.34 118265.37 11.90 SET
>> Incorrect timestamp 02/19/2007 18:44:31.259 90
>>
>> Reverse Packet Sequence Delta (ms) Jitter (ms)
>> IP BW (kbps) Marker Status Date Length
>> 44 1 0.00 0.00 1.45 [ Ok ] 02/19/2007
>> 18:44:36.119 231
>> 46 2 126.78 99992.08 2.90 [ Ok ]
>> 02/19/2007
>> 18:44:36.246 231
>> 47 3 293.16 193724.25 4.34 [ Ok ]
>> 02/19/2007
>> 18:44:36.539 231
>> 48 4 159.97 281606.49 5.79 [ Ok ]
>> 02/19/2007
>> 18:44:36.699 231
>> 49 5 119.98 363998.58 7.24 [ Ok ]
>> 02/19/2007
>> 18:44:36.819 231
>> 50 6 160.07 441238.67 8.69 [ Ok ]
>> 02/19/2007
>> 18:44:36.979 231
>> 51 7 261.00 513644.94 8.69 [ Ok ]
>> 02/19/2007 18:44:37.240 231
>> 52 8 43.09 481544.82 7.56 SET
>> Incorrect timestamp 02/19/2007 18:44:37.283 90
>> _______________________________________________
>> Wireshark-users mailing list
>> [email protected]
>> http://www.wireshark.org/mailman/listinfo/wireshark-users
>>
> _______________________________________________
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>
> _______________________________________________
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