[asterisk-users] Choice of soundfile format

[Matthew Rubenstein]

	What's the native soundfile format for SIP? Any idea which soundfile
takes the least CPU for mixing together in conferences?

	How about whether the CPU load for conferencing native data is
greater/less than the CPU load for transcoding non-native data that is
"CPU lighter" in the conference mixing phase?


On Wed, 2006-10-25 at 04:19 -0700,
asterisk-users-request at lists.digium.com wrote:
> Date: Wed, 25 Oct 2006 10:29:32 +0100
> From: Conrad Wood <asterisk-users at conradwood.net>
> Subject: Re: [asterisk-users] Choice of soundfile format
> To: Asterisk Users Mailing List - Non-Commercial Discussion
>         <asterisk-users at lists.digium.com>
> Message-ID: <1161768572.3203.21.camel at trivial.lemon.localdomain>
> Content-Type: text/plain; charset=UTF-8
> 
> On Wed, 2006-10-25 at 11:24 +0200, Jon Schpzinsky wrote:
> > Hello
> > 
> > What soundfile format, is the one that uses least transcoding during
> playback?
> > As I can see, I can choose wav or gsm. What sucks least cpu power,
> during playback to example a Zap channel? I would guess wav, but is
> this correct?
> 
> The one that is encoded in the same codec as the codec of the channel.
> On zap it's often alaw or ulaw so you can encode your files like that.
> You can encode the same file with different codecs and save it with
> different extensions (matching the codec) and asterisk will pick the
> most suitable one.
> If the channel is gsm, a gsm encoded file would be most efficient, as
> it
> doesn't need transcoding at all.
> 
> Conrad 
-- 

(C) Matthew Rubenstein