[asterisk-bugs] [JIRA] (ASTERISK-26924) Codec OPUS bad quality

[TSAREGORODTSEV Yury (JIRA)]

TSAREGORODTSEV Yury created ASTERISK-26924:
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             Summary: Codec OPUS bad quality
                 Key: ASTERISK-26924
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26924
             Project: Asterisk
          Issue Type: Improvement
      Security Level: None
          Components: Codecs/codec_opus
         Environment: Ubuntu 16.04 i386/x86_64
            Reporter: TSAREGORODTSEV Yury


Codec OPUS developed by Digium doesn't provide same good quality as open source version in case of packet losses, delays.

After comparing recorded degraded media with original sample using PESQ results shows average predicted MOS of Digium Opus almost twice less then open source.

How to reproduce issue:
1. Environment: ubuntu 16.04
2. Libopus latest stable release 1.1.4 (compiled from sources).
3. Asterisk 13.14.0
4. Channel driver: chan_sip
5. Configure 2 asterisk hosts, where 1st host origination side, 2nd host termination side.
6. Configure dialplan: on 1st host Dialplan with AppMonitor
7. Configure dialplan: on 2nd host Playback any wave file (8000, 16bit).
8. Opus config on both:
[opus]
type=opus
packet_loss=40
max_playback_rate=48000
bitrate=24000
cbr=0
fec=1
9. Compile ITU-T PESQ utility from
https://github.com/dennisguse/ITU-T_pesq
10. Simulate packet loss/delays on 2nd host with
    tc qdisc add dev eth0 root netem loss 20% delay 100ms 20ms distribution normal
11. Compare recorded degraded media (only incoming channel of course) with original:
./itu-t-pesq2005 +8000 original.wav recorded.wav



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