[speex-dev] question on usage of the libraries
jean-marc.valin at hermes.usherb.ca
Fri Dec 13 11:28:06 PST 2002
> I'm not sure if I should post this question to this list. If not; please
> tell me.
> Ok, here it comes:
> Is the following code correct for compressing audio? The output I get is so
> extremely small, but what is more important: if I pass it through zlib, it
> gets at least 50% smaller!
On regular data, gzip might get a 5% reduction, so I doubt you can get
50% unless you're encoding zeros or doing something wrong...
> if (sample_rate > 22050)
> libspeex_enc_state = speex_encoder_init(&speex_wb_mode);
> libspeex_enc_state = speex_encoder_init(&speex_nb_mode);
In normal operation, narrowband is 8000 Hz, wideband is 16000 Hz and
ultra-wideband is 32000 Hz, so I'd change the 22050 for something like
12000 (and maybe have above 22050 encoded in ultra-wideband if
Jean-Marc Valin, M.Sc.A.
Université de Sherbrooke, Québec, Canada
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