Wireshark mailing list archives
Wrong calculation of jitter by wireshark
From: capricorn 80 <cool_capricorn80 () hotmail com>
Date: Sat, 15 May 2010 11:58:45 +0000
Hi! I have captured the RTP packets on receiving side and check the values of jitter and than i calculated the values manually and it looks like wire shark is not calculating the values in correct way or may be I am doing some thing wrong. I am pasting all me calculation so that you people can verify it. Frame 18 Time of Arrival: 29.490533000 Timestamp: 365000 Frame 20 Time of Arrival : 29.501315000 Timestamp: 365160 D(i,j) = (Rj - Ri) - (Sj - Si) = (Rj - Sj) - (Ri - Si) J(i) = J(i-1) + (|D(i-1,i)| - J(i-1))/16 D = (29. 501315000- 29. 490533000) – (365160*0.000125 – 365000*0.000125) = -0.009218 J = 0 + (|-0.009218| - 0)/16 = 0.576 msec Frame 22 Time of Arrival: 29.520124000 TimeStamp: 365320 (29.520124000 - 29.501315000) – (365320*0.000125 – 365160*0.000125) =-0.001191 J= 0.576+(|-0.001191|-.576)/16 J= 0.54 , Wireshark calculation for frame 22 = 0.61 Frame 24 Time of Arrival: 29.539717000 Time Stamp: 365480 D=(29.539717000 - 29.520124000) – (365480*.000125-365320*.000125) D= -0.000407 J=0.54+(|-.000407|-.0.54)/16 J=0.50 Wireshark Calculation for frame 24 = 0.60 Really thanks for your time. Regards, Hotmail: Free, trusted and rich email service. Get it now. _________________________________________________________________ Your E-mail and More On-the-Go. Get Windows Live Hotmail Free. https://signup.live.com/signup.aspx?id=60969
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Current thread:
- Wrong calculation of jitter by wireshark capricorn 80 (May 15)
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- Wrong calculation of jitter by wireshark capricorn 80 (May 15)
- Re: Wrong calculation of jitter by wireshark capricorn 80 (May 16)