[Blink] New Blink Qt release 0.4.0 for Windows
mgraves at mstvp.com
mgraves at mstvp.com
Fri Jun 28 22:17:00 CEST 2013
> -------- Original Message --------
> Subject: Re: [Blink] New Blink Qt release 0.4.0 for Windows
> From: Adrian Georgescu <ag at ag-projects.com>
> Date: Fri, June 28, 2013 3:11 pm
> To: Emil Ivov <emcho at jitsi.org>
> Cc: Blink Support Forum <blink at lists.ag-projects.com>
> One that I know of is csipsimple on Android, it operates internally at 16kHz and there is no audible difference when using OPUS because of this reason.
Many people will implement the codec very quickly, without making any
effort to re-architect for its capabilities. This is an example of that
kind of quick-and-dirty implementation.
There's nothing fundamentally wrong with it if your intended application
is voice.However, Opus can do much more....given the effort.
I've called into a Freeswitch conference server with end-points running
Opus at 48 KHz and passed full bandwidth music across the link. It
sounded better than Pandora, although not in stereo....yet.
> On Jun 28, 2013, at 10:08 PM, Emil Ivov <emcho at jitsi.org> wrote:
> > On 28.06.13, 21:45, Adrian Georgescu wrote:
> >> That is because even if OPUS codec can use internally 48KHz sample rate
> >> that covers most human audible spectrum, the softphone you have used
> >> employs a smaller sampling rate like 8 or 16kHz, which renders the OPUS
> >> codec advantages useless, so you cannot hear any difference compared
> >> with let's say G722. Unless the whole audio processing chain works at
> >> the codec speed speed, the codec performance will not be visible.
> > Interesting. I don't think I've ever come across a softphone that does such a thing. Do you have a specific implementation in mind? Is this the one that MCG was referring to?
> > MCG, picking a default bitrate is not a simple matter, which is why many implementations allow you to play with it. You may want to try this.
> > Some could potentially be adapting it based on RTCP feedback but I don't think any of the current Opus supporting applications do this.
> > Cheers,
> > Emil
> > --
> > https://jitsi.org
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