Re: Jitter Buffer in Wireshark

[Jaap Keuter <jaap.keuter () xs4all nl>]

Hi,

Yes, the Wireshark implementation of a 'jitterbuffer', if you may call it, is 
rather poor. But then again, do you really need a high performance jitter 
buffer? It's not that you can use Wireshark to do MOS tests for you. That is 
really up to the performance of the endpoint, not the 'man in the middle' as 
Wireshark is.

Thanks,
Jaap

Krzysztof Cabaj wrote:
> Hi,
>
> Due to my research concerning jitter buffer, I tried to use Wireshark
> to evaluate a number of packets dropped by buffer. However, there is
> no description of jitter buffer implementation in Wireshark.
> Therefore, I have verified source codes for version 1.2.4. I analyzed
> file gtk/rtp_player.c and function decode_rtp_stream.
>
> And, I have few concerns.
>
> There is no real buffer, but only a number representing hypothetical
> buffer size (variable jitter_buffer).
> Packets are “dropped” when variable diff is greater than jitter_buffer
> (line 758).
> Variable diff represents absolute value in ms between real time of
> receiving this packet and time when this packet should be
> received (line 742).
>
> I would be very grateful if somebody who know this part of code could
> confirm these?
>
> Regards,
> Krzysztof Cabaj

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