opus - May 2015 - a problem with bandwidth configuration

Hi,



I try to run the opus_demo with input sample rate 16Khz and bandwidth ? FB,

I want the encoder to convert the rate, which I thought it would.



"./opus_demo ?e audio 16000 1 50000 ?bandwidth FB?."



But when I look at the frames created, the Toc ? config has values of
16Khz.

For example "0xB8":

"Config" = 0x17 = 23, which means CELT only WB 16Khz 20ms

"s" ? 0

"c" -0



I expected "config" filed of 15 or 31, that means "FB".



It seems that the encoder's bandwidth is always the same as the input
sample rate.

Dows't it suppose to make a rate convertion?



Thanks,

Michal
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.xiph.org/pipermail/opus/attachments/20150517/a701d4e3/attachment.htm

Michal Weiss wrote:
> It seems that the encoder's bandwidth is always the same as the input
> sample rate.
>
> Dows't it suppose to make a rate convertion?
Audio bandwidth is not the same thing as sample rate. Even if you fed 
the encoder 48 kHz data, if there was no signal energy above 8 kHz (or 
at sufficiently low bitrates) it could choose to use a WB config, and 
could change this decision on a packet by packet basis.

The decoder can decode any configuration at any sample rate. If you pass 
the encoded output of ./opus_demo -e audio 16000 ... to ./opus_demo -d 
48000 ... you will get 48 kHz output.