[Freeswitch-users] Sample rate and recordFile

[Andy]

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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