I am pretty sure that Wireshark just uses missing RTP sequence numbers
(rtp.seq) to calculate loss. I just took a G729 RTP stream and
manually deleted a few frames, reloaded, and the Telephony:RTP:Show
All Streams statistics definitely showed the appropriate loss.
Regards, Martin
MartinVisser99@xxxxxxxxx
On 12 January 2011 09:57, nangergong <nangergong@xxxxxxxxx> wrote:
> Hi,all:
>
> I'm using wireshark to capture a VOIP-alike telephony call. The packets
> are RTP, which carry audio payload encoded with G729 codec, I use dummynet
> to impose packet loss. Previously, when the codec is G711, wireshark can
> show the exact packet loss, Now the codec is G729, the wireshark always
> shows 0 packet loss when I set packet loss to 2%, is it because that the
> wireshark is not able to analyse G729 audio stream and thus just show 0%
> loss? Thank you!
>
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