[Asterisk-Dev] Formats for storing Audio archives.

[James Gardiner]

On the topic below..

>  On Thu, 2004-04-15 at 20:22, James Gardiner wrote:
> > Thanks Steve,
> > Very helpful, really appreciated,
> > 
> > But do you think that because I am joining the two voice channels into 
> > one STEREO wav file, (One channel to the left, the other to the 
> > right.)  is GSM still the best method.
> 
> GSM is a monno only format. It is specialised for telephony. Stereo would
have to either be down mixed or stored in another format.
> 
> > I did try ogg with default parameters, and it was only a few k more 
> > then the GSM file.
> > I'm ruff at this, so maybe I should try it some more and make sure, 
> > clear I am comparing apples with peaches. ;)
> 
> It all depends on how you want to access these files.
> 
> BTW, it is important to keep these messages on list so it helps the
greatest number of people.

Well, for storing the audio from a call, it does sound like a good idea to
keep each channel separate so a left/right (Caller/receiver) stereo mix
sounds like a great idea, especially if you need to really analyse one of
the channels audio for whatever reason.
However, if going to this level, a good compression with least drop in audio
quality is what your most likely looking for.

In terms of accessing the files, an archive would more likely be accessed
via WEB interface.  So standard audio compressions like MPEG audio OGG or
other free based hi quality methods would be ok.  Mainly as we want an audio
format readily available on any PC without having to use special player. (Ie
GSM is not supported out of the box from windows from my understanding.)

Considering all this, I was wondering if the list had any comments on this.

I wanted to discuss this application as I plan to implement all phone calls
in my company being archived.  I have had considerable problems with loosed
lipped employees and Intellectual property issues in our organisation with
use of our facilities for employees own gain.

Thanks,
James
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