[Freeswitch-users] Sample rate and recordFile

[Anthony Minessale]

or go over the limit and you'll have Max Headroom =D


On Thu, Jun 18, 2009 at 1:16 PM, David Knell <dave at 3c.co.uk> wrote:

> - plus UDP/RTP overhead.  Budget 10 calls/megabit for G.711 and you'll
> have a bit of headroom available.
>
> --Dave
>
> > Most calls are at 8kHz. The formula for bandwidth is sampling rate *
> > bit rate * channels, so 8000 * 8 * 1 = 64000 = 64kbps (per way).
> >
> >
> > Math
> >
> > On 18-Jun-09, at 1:01 PM, Andy wrote:
> >
> > > Thanks Brian,
> > >
> > > So, just to calrify will the base call always be 8kHz?
> > >
> > > On a related note, do you happen to know the bitrate of each open
> > > channel/live call? Is it 16 kilobits per second like the recorded
> > > audio? I need to do some calculations on the badwidth required to
> > > handle a certain number of concurrent calls.
> > >
> > > Many thanks
> > > Andy
> > >
> > >
> > > ____________________________________________________________________
> > > From: freeswitch-users-bounces at lists.freeswitch.org
> > > [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of
> > > Brian West
> > > Sent: 18 June 2009 18:11
> > > To: freeswitch-users at lists.freeswitch.org
> > > Subject: Re: [Freeswitch-users] Sample rate and recordFile
> > >
> > >
> > >
> > >
> > > On Jun 18, 2009, at 11:54 AM, Andy wrote:
> > >
> > > > 1) I notice that when I change the sample rate it automatically
> > > > changes the bit rate too. I understand why this is the case but
> > > > wondered if it was just as easy to be able to control the bitrate
> > > > as well as the sample rate.
> > >
> > >
> > > If you're talking about mod_shout, NO.  You'll end up picking an
> > > invalid bitrate and asking why it doesn't work... been there done
> > > that... I changed it a few months back to pick the optimal bitrate
> > > for the sample rate.
> > >
> > > > 2) When I use a sample rate other than 8000 I get a warning
> > > > 'Sample rate doesn't match'. I guess this puts some extra load on
> > > > the server. If all my calls are being recorded and all at 11025
> > > > can/should I alter the sample rate of the base call to 11025?
> > >
> > > NO.  Your phone call is running at 8kHz, Your sound file is 11025
> > > and they don't match, If you were to play this file into an 8k
> > > channel without a resample it would sound a little like satan.  or a
> > > dragging tape deck.  The file has to be resampled to match the
> > > current session rate.
> > >
> > >
> > > /b
> > >
> > >
> > > _______________________________________________
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> >
> >
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> --
> David Knell, Director, 3C Limited
> T: +44 20 3298 2000
> E: dave at 3c.co.uk
> W: http://www.3c.co.uk
>
>
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>



-- 
Anthony Minessale II

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