Posted: Sun Jul 09, 2006 2:41 pm Post subject: Very Long Lag using IdeFisk
Hi, I was the chap who petitioned you previously to increase the size of the jitter buffer when I was getting nothing but glitchy calls to a receiver who is on a fairly iffy wireless link some distance away
The quality of idefisk is now very good, but it seems that idefisk has now gone too far and is using an excessively large jitter buffer, perhaps as much as 1.5 seconds?
As near as I can tell the lag is around 300ms from the remote idefisk to my asterisk box, but the roundtrip delay from me to the caller suggests that they don't hear me until perhaps 1.5 secs later. This suggests that it's the jitter buffer on the idefisk end which is introducing the lag, and also that it's not necessary to have such a long lag on this line
Very occasionally the lag decreases. I am thinking that because the delay is quite high to this caller (they are on a satellite link which is shared with several users over wireless) and probably the jitter is extremely high, that idefisk is getting confused and going for an excessively high buffer? Perhaps the algorithm is to size for worst case say?
Also Skype used over the same link exhibits less lag (which is annoying because I am trying to stop the person using Skype and convince them that other softphones are just as good...)
Could I request that the algorithm is made a little more aggressive? For example if the buffer goes over around 330ms that the increases are made more slowly and perhaps even that we trade a little packet loss in the name of keeping the buffer a reasonable size?
The idea is that users perceive a 500ms delay with tiny amounts of breakup to be higher quality than near perfect audio with a 2 second roundtrip time...
so the problems are probably from somewhere else except if the jitterbuffer somehow exceeds this values.
We will investigate this problem.
Thank you for the report.
We will appreciate any additional details.
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