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I'm sharing records from phone conferences on my website, and would like to save space. It would be nice if I could use speex as I get about 5:1 compression compared to mp3. However most people would need help getting speex to play on their computer, and can't play it on their portable devices.
What can I use to get good compression for speech that average people will be able to play?
The only ubiquitous one is mp3. AAC is great on Apple products, but only mp3 works on everything.
When storing voice audio you can go for a very low quality, and potentially use mono if you don't require stereo. This will give you very high compression - approaching that of speex.
From the Wikipedia comparison page
Bit Rate:
It depends on what is your target platform. Is it computers or mobile phones or something else? What OS is this?
As such, I believe speex is definitely a better choice. It is a speech codec, whereas mp3 is an audio codec. Speex is supported by most platforms.
To ease the download try using Gstreamer or ffmpeg where this comes built-in. So user's don't have to put so much extra work into it.
GSM encoded WAV files are a good option.
I did some testing and got very good file size reduction results with perfectly acceptable audio quality.
The original file directly from my phone system was 272 KB. The file I converted into GSM was 28KB.
Here are the links for the sample files. Orignal File http://dl.dropbox.com/u/3594910/random_audio/vmail_16783201700_221_20110217160445.wav
GSM File http://dl.dropbox.com/u/3594910/random_audio/vmail_16783201700_221_20110217160445_GSM.wav
