[Flent-users] [tohojo/flent] packet loss stats (#106)

Pete Heist notifications at github.com
Sun Nov 19 14:12:41 EET 2017

G.711 can be simulated today with `-i 20ms -l 172 -fill rand -fillall`. I do this test pretty often, and I think it would be a good default voip test. The reason for the 172 vs 160 is the addition of a 12 byte RTP header, which is present in the wireshark trace of a SIP G.711 call:


GSM is older now and I'm not sure how much it's still used over the Internet, but since it has a payload size of 33 bytes(?), some statistics would have to be sacrificed. I'd give up server received stats and dual timestamps, so `-i 20ms -l 33 -rs none -ts midpoint` is a start. Not sure about additional headers.

It should possible to simulate Opus in CBR mode in a similar way. But Opus also supports VBR, which would require varying packet sizes, which irtt can't yet do (plus, this would invalidate or at least pollute the IPDV calculation).

You are receiving this because you commented.
Reply to this email directly or view it on GitHub:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://flent.org/pipermail/flent-users_flent.org/attachments/20171119/d61d30b5/attachment-0002.html>

More information about the Flent-users mailing list