[Freeswitch-users] Fine tuning Opus in dialplan

Stanislav Sinyagin ssinyagin at gmail.com
Wed Feb 11 02:00:30 MSK 2015


hi Emrah,

there's a bunch of comments in FS-6947 which I guess you missed. As
per standard, Opus codec always requires that RTP is encoded with
48000Hz stereo, and there's always up- and downsampling if you feed
the codec with 8KHz sound.



On Tue, Feb 10, 2015 at 10:42 PM, Emrah <lists at kavun.ch> wrote:
> Hi,
> I use Opus even for narrowband calls because of all its bells and whistles that PCM doesn't have. The trouble is that I always end up negotiating a crazy sampling rate, more demanding in every way and not necessary for a basic narrowband call. I know this because if I record the call, one leg is recording a full 48kHz audio that is unbelievable and the other one is a regular 8kHz sad PSTN call. I have 40kHz going to waste here.
> I see issue 6947 seems to be talking about the same thing and was wondering if something had been done about it.
> https://freeswitch.org/jira/browse/FS-6947
>
> It shows it's been solved, but I cannot see any dialplan variables I could set to fine tune my Opus codec negotiation.
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