[asterisk-users] Choice of soundfile format

[Noah Miller]

>> 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?

When you get down to it, the asterisk native format is slinear.
Fortunately, you're in luck as Kristian Kielhofner did the asterisk
community a big favor and had Alison re-record all the asterisk
sounds, and he put them in slinear format.  You can find them on the
astlinux website (there's other formats, too):

http://www.astlinux.org/index.php?option=com_content&task=view&id=38&Itemid=43

- Noah



On 10/25/06, Matthew Rubenstein <email at mattruby.com> wrote:
>         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
>
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