asterisk users - Oct 2006 - Choice of soundfile format

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?

 
Kind Regards
Jon Leren Sch?pzinsky

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On Wed, 2006-10-25 at 11:24 +0200, Jon Sch?pzinsky
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

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@lists.digium.com wrote:
> Date: Wed, 25 Oct 2006 10:29:32 +0100
> From: Conrad Wood <asterisk-users@conradwood.net>
> Subject: Re: [asterisk-users] Choice of soundfile format
> To: Asterisk Users Mailing List - Non-Commercial Discussion
>         <asterisk-users@lists.digium.com>
> Message-ID: <1161768572.3203.21.camel@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