[SR-Users] RTPengine - Transcoding example available?

[Denys Pozniak]

Thank you, Richard!
Works well!

On 20 February 2018 at 20:00, Richard Fuchs <rfuchs at sipwise.com> wrote:

> On 2018-02-20 05:46 AM, Denys Pozniak wrote:
>
>> Hello!
>>
>> Please explain how to achive next:
>>
>> Side A supports:
>> OPUS
>> PCMA
>>
>> Side B supports:
>> OPUS
>> PCMA
>> PCMU
>>
>> I need to transcode in direction A->B from PCMA to OPUS?
>> So should be like this:
>> A(PCMA) -> (PCMA)Rtpengine(OPUS)->B(OPUS)
>>
>> I configured like this:
>> rtpengine_offer("codec-mask-PCMA codec-transcode-opus");
>> rtpengine_answer("codec-mask-opus codec-transcode-PCMA");
>>
>> But leg from Rtpengine to A has wrong codec (OPUS):
>> https://drive.google.com/file/d/14GAIt8lL7Igj9S95b_RS6CXtmGVhjLa1/view
>>
>>
> You don't need to put any transcoding options into rtpengine_answer() -
> they should all go into rtpengine_offer()
>
> Since A supports all codecs that B supports except PCMU, you can add PCMU
> into the offer going to B with:
>
> rtpengine_offer("... transcode-PCMU")
>
> But most likely both sides will end up talking Opus (without transcoding)
> since they both support it and it's listed first. If B ends up talking PCMU
> to rtpengine, it will transcode it to Opus as A doesn't support PCMA and
> Opus is first in its list. If either side ends up talking PCMA, it's also
> passed through without transcoding since both sides support it.
>
> If you want to force PCMA on A's side and Opus on B's side, you need to:
>
> 1) accept PCMA from A, but don't offer it to B: codec-mask-PCMA
> 2) ignore that Opus was offered from A: codec-strip-opus
> 3) offer Opus to B: transcode-opus
>
> Make sure you update your rtpengine code base as this use case has only
> just been implemented (previously the `transcode` option would simply
> negate the `codec-strip` which is not what you want). Full example:
>
> rtpengine_offer("... ICE=remove codec-mask-PCMA codec-strip-opus
> transcode-opus")
>
>
> Cheers
>
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-- 

BR
Denys Pozniak
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