[Freeswitch-users] FEC and bitrates

[David Villasmil]

Hey Dragos,

Thanks for that, yeah i think the issue is on the client side somehow, i
had already tried not negotiating...

Regards,

David Villasmil
email: david.villasmil.work at gmail.com
phone: +34669448337


On Sat, Dec 18, 2021 at 4:41 AM Dragos Oancea <dragos at freeswitch.org> wrote:

> David,
>
> Most likely your mod_opus is configured to respect the remote's fmtp and
> not the maxaveragebitrate and maxplaybackrate that you configure. You have
> bitrate-negotiation set to true.
> It looks it's going in WB mode if you are sure it starts sending FEC at
> over 16 kbit/s .
> Value 14400 was chosen as config default only because is one step above
> 14000 which is one of the LBRR thresholds (Opus's bitrate works in steps of
> 400 bits/s) and it also provides a good compromis loss/audio quality for
> NB.
> https://github.com/xiph/opus/blob/master/silk/define.h#L52
>
> /* LBRR thresholds */
> #define LBRR_NB_MIN_RATE_BPS 12000
> #define LBRR_MB_MIN_RATE_BPS 14000
> #define LBRR_WB_MIN_RATE_BPS 16000
>
>
> FEC threshold in FS is this:
> #define SWITCH_OPUS_MIN_FEC_BITRATE 12400 - one step above codec's LBRR
> threshold for NB. LBRR means Low Bit Rate Redundancy which means FEC.
>
> Regards,
> Dragos
>
>
>
>
> On Sat, Dec 18, 2021 at 3:06 AM David Villasmil <
> david.villasmil.work at gmail.com> wrote:
>
>> Hello all,
>>
>> i've been testing FEC and how low we can go with maxavgbiterate
>>
>> <param name="use-vbr" value="1"/>
>> <param name="use-dtx" value="1"/>
>> <param name="complexity" value="10"/>
>> <param name="packet-loss-percent" value="15"/>
>> <param name="asymmetric-sample-rates" value="1"/>
>> <param name="bitrate-negotiation" value="1"/>
>> <param name="keep-fec-enabled" value="1"/>
>> <param name="use-jb-lookahead" value="true"/>
>> <param name="maxaveragebitrate" value="14400"/>
>> <param name="maxplaybackrate" value="8000"/>
>> <param name="sprop-maxcapturerate" value="0"/>
>> <param name="adjust-bitrate" value="1"/>
>>
>> we only see FEC if we set maxavgbiterate to 18000, we see no FEC with
>> 14400
>>
>> anyone knows what i'm missing?
>>
>> Regards,
>>
>> David Villasmil
>> email: david.villasmil.work at gmail.com
>> phone: +34669448337
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> _________________________________________________________________________
>
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN
> services.
> Build your next product on our scalable cloud platform.
>
> Join our online community to chat in real time
> https://signalwire.community
>
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
>
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
>
> FreeSWITCH-users mailing list
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