Hi Alexander, I did try your opus version including native PLC patch (on asterisk 13.14.0, everything compiled without issues but anyway maybe version is too high ?) I wouldn't see much improvements on quality..... From my personal point of view it's sounds little bit better, from point of view PESQ - predicted MOS its same as without native patch, around 1.025. If you have time I can setup for you 2x ESXI instances with prepared environment of 2x asterisk with simple configuration and ITU-T PESQ utility, so you can hear everything yourself.
P.S. stupid question, but anyway, will it be a solution to use RTP on TCP if we have high loses/delay spikes ? > On 3 Apr 2017, at 11:51, Alexander Traud <pabstr...@compuserve.com> wrote: > > With Opus Codec, speech frames interdepend. When one RTP packet is lost, > several frames are corrupted. Furthermore, when the RTP packet is not lost > but just late, Asterisk simply forwards it down to the transcoding modules. > Consequently, a late packet corrupts even more frames. > > The Opus Codec is able to cope with all this. It is called native packet-loss > concealment (Native-PLC). However, Asterisk has to tell the Opus Codec > library that there was loss. In RTP, its sequence number can be used for > this. More details in <http://issues.asterisk.org/jira/browse/ASTERISK-25629>. > > At <http://github.com/traud/asterisk-opus>, you find a module which uses the > PLC of Opus Codec. To enable Asterisk to signal loss/late, you have to apply > the <enable_native_plc.patch> there. Please, give it a try and report whether > it improves the situation for you. > > When that approach is better, someone (you?) has to drive Native-PLC in > Asterisk. Or you sponsor a bug bounty so someone drives Native-PLC into > Asterisk on your behalf. > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-dev mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-dev -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev
