[asterisk-users] Which sound file formats?

[Lee, John (Sydney)]

> If you want to produce just one, I'd recommend producing slin or wav,
as
> they are essentially the same (slin is just wav without the header).
The
> thing to note about this format is that as it is uncompressed, you
will
> reduce
> the amount of work needed for transcoding (other than if you have
native
> files), because transcoding from, for example, gsm to speex requires
two
> transcoding operations:  first, uncompress from gsm, and second,
compress
> to speex.  By adapting the most common intermediate format, you only
need
> one
> transcoding operation per packet.  Native files require no transcoding
at
> all.
> Transcoding tends to be the most CPU intensive task on a typical
Asterisk
> machine.

I recently paid Allison Smith to produce a few prompts for me.  I was
able to use the .gsm ones on Asterisk but not for the high quality .wav
files.  
However, I was able to play the wav file produced by text2wav. 
So, I ended up just using the .gsm format.