[asterisk-users] Call Recording audio file quality query

[faisal at vopium.com]

But if you are getting calls all the way on VoIP then you can have calls in HD audio using HD audio codec on all locations (Server and Client). In that case you either need use some available 3rd party solution which uses packet capturing to trace the calls and record call using packet capture and assembling regardless of server as asterisk still will not be able to record call in HD but some other switches like FreeSWITCH can do it or you need to write your own app like it.



-----Original Message-----
From: "Ishfaq Malik" <ish at pack-net.co.uk>
Sent: Tuesday, February 8, 2011 6:47am
To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users at lists.digium.com>
Subject: Re: [asterisk-users] Call Recording audio file quality query

On Tue, 2011-02-08 at 05:40 -0600, Sherwood McGowan wrote:
> On Tue, Feb 8, 2011 at 5:09 AM, Ishfaq Malik <ish at pack-net.co.uk>
> wrote:
> Hi
> 
> We're getting requests coming in for higher quality audio in
> our call
> recordings. We currently use MixMonitor and everything is
> being saved in
> it's native 8000Hz, 16 bit wav format.
> 
> I have seen information on using Monitor and specifying a
> conversion to
> mp3 when the call ends and the 2 channels get mixed but surely
> the 2
> channels are already saved as 16bit 8000Hz wav files so the
> quality is
> lost already?
> 
> Is there any way of making high quality recordings of call
> content?
> 
> 
> Have you ever heard of the saying "You can't polish a turd" ? 
> 
> It doesn't matter if you have an app capable of recording 196Khz 24bit
> recordings (or capable of upsampling to that sample rate)...if the
> call itself is native at 8Khz 16bit, you'd just be making a bigger
> recording file with no literal improvement in quality. 
> 
> You can't create more samples of audio from nothing. it's like taking
> a new box of, say, 50 paperclips... Now, go get an empty box that says
> it contained 250 paperclips when it was purchased... Now, throw all 50
> paperclips from the little box into the big box marked 250..now,
> imagine REALLY REALLY hard that you think you can perceive about 5
> more paperclips somewhere all mixed up in the
> jumble...(Extrapolation)....
> 
> that, my friend, is an over simplified metaphor, but in essence it's
> close enough to get the point across..
> 
> Sorry bud :( If you don't believe me, I can refer you to my old audio
> production school ;-D )
> 
> Slainte!
> the Mick
> 
That answer was pretty much what I was expecting. Just wanted to make
sure.

-- 
Ishfaq Malik
Software Developer
PackNet Ltd

Office: 0161 660 3062


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