[asterisk-users] Which sound file formats?

[Roderick A. Anderson]

Tilghman Lesher wrote:
> On Monday 12 May 2008 17:27, Roderick A. Anderson wrote:
>> Al Baker wrote:
>>> Asterisk will automatically chose the best format  - per ATFOT
>> I guess I'm not getting my head wrapped around this concept.  I
>> understand the choosing but not how I might influence it.  Probably best
>> to just build them all and let Asterisk sort it out.  I'll research this
>> some more.
> 
> 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.
> 

Tilghman,

Once again you come through clear.  But just to make sure I transcode 
this correctly I can remove all the other formats and only have .wav 
and/or .slin files.

Simple and clean.  Plus swift can generate the .wav files optimized for 
VoIP.  I can go sox-less.  :-)


Thanks,
Rod
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