Jeff Brower wrote: > Jonathan- > >>> How did you measure the gaps? Using signal or speech analysis >>> software to display the recording? If you measure number of >>> samples between the gaps, does it correspond to multiples of RTP >>> packet payload length (for example, for 8 kHz G711 multiples of >>> 80 samples between gaps) ? >> >> I just loaded the file into audacity and measured the gaps by >> looking at the wave form. I just went through some of the samples I >> recorded yesterday, and found that all the gaps are multiples of 8 >> samples - from 8 up to 32. I guess that's because dahdi/zaptel >> ticks are 8 samples each, so if it misses one, 8 samples get lost. >> I can't imagine that RTP is involved, since this is happening with >> purely local channels (just the Playback application and the eagi >> script) > > Did you measure the distance between gaps? If those distances are > multiples of RTP payload length, then possibly a network latency > issue is involved, but otherwise I agree with other posters, it > sounds more like a timing and/or sampling synchronization problem.
I just did this, and oddly enough, the distance between gaps *is* multiples of 80 - 640, 7360, 8480 samples on the recordings that I just tested. I say oddly, because there is no network latency involved - everything is local. It's playing a local audio file into a conference and recording the audio through the eagi script - nothing else. > Are you handling TDM data, for example T1/E1 or ISDN? I'm not sure what TDM data is, but I'm pretty sure I'm not using it. The only telephony thing used in my application is a handful of sip connections, but these problems show up even if they aren't used, as mentioned above. Now I'm getting rather confused... why would I be seeing the RTP payload length show up up anywhere at all? Maybe asterisk uses it internally for something else? -- Jon-o Addleman - http://www.redowl.ca -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
