opus - Mar 2015 - Sampling rate using opusenc

Hello list members,

If I encode a CD quality (44.1kHz @ 16 bits) wav file with the
"opusenc"
tool using the "--speech" option (optimize for speech according to the
documentation),

what would be the sampling rate of the resulting file?

The encoder tells me the bit-rate of the encoded file, but it says nothing
about the sampling rate.

Does the tool use the Full-Band option or does it downsample to use a
narrower bandwidth?

Any lights on this question will be really appreciated.

Thank you very much.

Nicanor Garc?a O.
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On 2015-03-05 5:58 AM, Nicanor Garcia wrote:
> Does the tool use the Full-Band option or does it downsample to use a
> narrower bandwidth?
The encoder will use full band or may select a lower bandwidth,
depending on the target bitrate and the complexity of the input.

Files encoded with opus don't have a fixed sample rate in the sense that
you're asking. The format can adjust the represented audio bandwidth
dynamically to make the best tradeoff between quality and size.

So if you decode your results with oggdec, you'll get another 44.1 kHz,
16-bit WAV file, to match the same rate of your original input. But if
you use a low bitrate and look at the spectrum, you'll be able to see
less faithful representation of the higher frequencies, for example.

Hope that helps,
 -r