[asterisk-users] codec_opus w/ PLR and FEC for Asterisk 11

[sean darcy]

There is an opus patch for asterisk 11. 
https://github.com/seanbright/asterisk-opus/tree/asterisk-11 . But it 
doesn't have Packet Loss Resilience or Forward Error Correction, both of 
which are important for voip.


2.1.6.  Packet Loss Resilience

Audio codecs often exploit inter-frame correlations to reduce the 
bitrate at a cost in error propagation: after losing one packet, several 
packets need to be received before the decoder is able to accurately 
reconstruct the speech signal. The extent to which Opus exploits 
inter-frame dependencies can be adjusted on the fly to choose a 
trade-off between bitrate and amount of error propagation.

2.1.7.  Forward Error Correction (FEC)

Another mechanism providing robustness against packet loss is the 
in-band Forward Error Correction (FEC). Packets that are determined to 
contain perceptually important speech information, such as onsets or 
transients, are encoded again at a lower bitrate and this re-encoded 
information is added to a subsequent packet.


There is an opus patch for asterisk 13 that includes PLR and FEC. 
https://github.com/traud/asterisk-opus.

We don't have approval to move to 13. So anybody have an opus patch for 
11 that includes PLR and FEC ?

sean