On Fri, Mar 31, 2017 at 6:54 PM, Yury Tsaregorodtsev <aero.1...@icloud.com> wrote:
> Examples of OPUS with 30% of LOSS with FEC on http://opus-codec.org/ > examples/ > Sounds too perfect. Why I can't achieve even similar quality on asterisk > with built codec by digium? > To simulate 30% packet loss I use: > > # tc qdisc add dev eth0 root netem delay 100ms loss 30% > > But even with 15-20% of loss it's almost impossible to talk. > Tried different bitrates, result is always same. > If I do PESQ predicted MOS of degraded audio (recorded with packet loss) > in compare to original: 1.025 > Horrible results, horrible sound. > > Anyone get better experience using opus with huge packet losses ? > > Have you enabled FEC and made sure both sides negotiated it? If not you can enable it within "codecs.conf" by setting "fec=yes". When a packet has been lost and the decoder receives a frame with FEC data (and fec is enabled) it will attempt to rebuild the lost packet (current packet minus one) from the given FEC information. Kevin Harwell Digium, Inc. | Software Developer 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA Check us out at: http://digium.com & http://asterisk.org
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