[Freeswitch-users] Opus packet loss

[Dragos Oancea]

When trying to understand how it works make sure you are not mixing
decoding side settings with the encoding side settings.
packet-loss-percent is encoding side and is the initial value for loss if
you use adjust-bitrate (callback with SCC_AUDIO_PACKET_LOSS from the core)
.
The callback comes only if there is incoming RTCP - which for audio is
typically at 5 seconds interval.So the adjust-bitrate feature will update
the loss too, not only the bitrate.

Otherwise, without adjust-birate, it's the default value
for OPUS_SET_PACKET_LOSS_PERC() which will stay like this along the call
and depending on the preset bitrate it will generate a certain amount of
FEC on top of the payload of some of the packets (encoder decisions) .  So
no, you should not set that very high, since you can't know the real
network conditions before the call is made. 15 or 20 are good values.


On Fri, Mar 12, 2021 at 9:05 PM Brian West <brian at freeswitch.com> wrote:

> CPU and bandwidth.
>
> /b
>
>
> On Fri, Mar 12, 2021 at 12:40 PM Terry C <infinite3219 at gmail.com> wrote:
>
>> Hi,
>>
>> We use FreeSwitch 1.10.5 with Opus audio for clients. We target voice
>> quality to be wideband. The config settings are below. We also set a jitter
>> buffer in the dialplan.
>>
>> Is there a downside to increasing the packet loss percent to 40-50% other
>> than using more bandwidth? Is there a voice quality impact if you set it
>> too high (what would be considered too high)?
>>
>> Thanks.
>>
>> <param name="use-vbr" value="1"/>
>> <param name="use-dtx" value="1"/>
>> <param name="complexity" value="10"/>
>> <param name="packet-loss-percent" value="30"/>
>> <param name="keep-fec-enabled" value="1"/>
>> <param name="use-jb-lookahead" value="1"/>
>> <param name="maxaveragebitrate" value="40000"/>
>> <param name="maxplaybackrate" value="16000"/>
>> <param name="sprop-maxcapturerate" value="16000"/>
>> <param name="adjust-bitrate" value="1"/>
>> </settings>
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> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
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>
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>
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