[OpenSIPS-Users] RTPEngine - changing codec format parameters from default values when transcoding - OpenSIPS 3.1

[Johan De Clercq]

No worries

On Wed, Sep 15, 2021, 11:43 Mark Allen <mark at allenclan.co.uk> wrote:

> Ah! Thanks Răzvan and Johan. I was thinking that the options described in
> the OpenSIPS RTPEngine module documentation were the only ones
> available, but I missed the key phrase...
>
>     *When passing an option that OpenSIPS is not aware of, it will be
> blindly sent to the rtpengine daemon to be processed.*
>
> ...I should be fine from here I think. Thanks for your help.
>
>
> On Tue, 14 Sept 2021 at 14:29, Răzvan Crainea <razvan at opensips.org> wrote:
>
>> I think the proper way to do it is
>>
>> `transcode-opus/48000/2/32000//maxplaybackrate--48000;stereo--0;useinbandfec--1;maxaveragebitrate--32000`
>> Anyway, as Johan suggests, follow the rtpengine documentation, you will
>> find more info there.
>>
>> Best regards,
>>
>> Răzvan Crainea
>> OpenSIPS Core Developer
>> http://www.opensips-solutions.com
>>
>> On 9/14/21 15:51, Mark Allen wrote:
>> > Hi Răzvan
>> >
>> >     OpenSIPS passes the commands to RTPengine as you supply them, so in
>> >     theory this should be supported. Did you try to set this up? Can you
>> >     provide any logs about this?
>> >
>> >
>> > No. I'm not sure how I would specify this in the opensips.cfg
>> > rtpengine_offer parameters. From the documentation for the
>> > rptengine OpenSIPS module, it doesn't seem as if something like the
>> > following is an option...
>> >
>> >
>> >
>> transcode-opus='opus/48000/2/32000//maxplaybackrate=48000;stereo=0;useinbandfec=1;maxaveragebitrate=32000'
>>
>> >
>> >
>> > ...however, if I have tried this in the code (with or without quotes)
>> it
>> > doesn't produce an error, either from OpenSIPS or rtpengine, but
>> neither
>> > does it do anything - Opus fmtp in the SDP is not changed. I guess I'm
>> > looking for the correct OpenSIPS syntax to pass these parameters
>> > successfully to rtpengine
>> >
>> >
>> >
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>> >
>>
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