[asterisk-bugs] [JIRA] (ASTERISK-26564) Very poor sound quality in SiLK implementation

[Sam For (JIRA)]

Sam For created ASTERISK-26564:
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             Summary: Very poor sound quality in SiLK implementation
                 Key: ASTERISK-26564
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26564
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Codecs/codec_silk
    Affects Versions: 13.12.1
         Environment: Ubuntu 14.04. Asterisk 13.12.1.
            Reporter: Sam For


Using Asterisk 13.7.2 with the traud/asterisk-silk patch gives very good sound quality on transcoded audio.

Using Asterisk 13.12.1 with the digium-silk-binary gives very poor sound  quality on transcoded audio.

The quality difference can easily be heard by listening to the two different sound files I've attached.

I have attached the following to this ticket:
1) PCAPs for the calls on versions 13.7 and 13.12.1
2) Audio file recordings for each version

I used SLN16 sounds version 1.4.27 for both tests.

I used the following dialplan:

exten =>       5004,n,Answer
exten =>       5004,n,Wait(3)
exten =>       5004,n,Playback(priv-callee-options)
exten =>       5004,n,Hangup

I used Jitsi as a client with SiLK/16000.

This was the codec setting for codecs.conf for 13.12.1:
[silk16]
type=silk
samprate=16000
fec=true
packetloss_percentage=10
maxbitrate=24000
dtx=true

As it stands now, the Digium SiLK codec binary is unusable unfortunately.




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