[Speex-dev] Encoding audio sampled at 44.1 khz?

[David Hogan]

Hi Peter,

Have you considered resampling the raw 44.1kHz stereo source files using
a program such as http://audacity.sourceforge.net/, say to 16kHz mono or
32kHz mono, and then using the wideband or ultrawideband speex modes to
encode the result?

Alternatively, if you want to programmatically do the resampling
yourself, you could try the new resampling API in the svn head of speex,
or the GPL library 'Secret Rabit Code'.

Hope this helps,
David Hogan

> -----Original Message-----
> From: speex-dev-bounces at xiph.org 
> [mailto:speex-dev-bounces at xiph.org] On Behalf Of Peter Mosedal Laursen
> Sent: Thursday, 22 March 2007 6:13 AM
> To: speex-dev at lists.xiph.org
> Subject: [Speex-dev] Encoding audio sampled at 44.1 khz?
> 
> Hi everyone, 
> 
> I recently began using libspeex 1.2 Beta 1 on Windows using 
> MS Visual C++. I have gotten a decoder and an encoder to work 
> fine from the excellent sample code posted at the website. 
> 
> But I face a problem. I am working on using Speex in a 
> program to play and create audio books encoded using Speex 
> (currently testing it only; for these tests, I do not use Ogg 
> to save the encoded frames, even though the data is saved to 
> a disk). Some of the files I have are files encoded at 44100 
> samples per second stereo. This is not music, but audio books 
> recorded from CDs.
> 
> Is it possible to encode those data using Speex? The files I 
> tested with ended up taking larger amounts of space than the 
> original files. 
> 
> If it is not possible, I should be very glad if someone could 
> show me how to resample my audio at a lower sampling 
> frequency or point me to a place where I might learn of such 
> things. (I am very much a beginner when it comes to 
> programming with audio data).
> 
> I look forward to hearing from you. 
> 
> Best regards, 
> 
> Peter.
> 
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