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

[Mark Allen]

Just posting this to document the end result. The following line to
pass the transcoding parameters I wanted directly to the RTPEngine daemon
worked for me:


transcode-opus/48000/2/32000//stereo--0;useinbandfec--1;maxplaybackrate--16000;sprop-maxcapturerate--16000

NB - The '--' part means '=' and is there to avoid parsing errors in
RTPEngine



On Wed, 15 Sept 2021 at 10:58, Johan De Clercq <Johan at democon.be> wrote:

> 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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