[opus] Antw: Re: Q: Bandwidth vs. bitrate

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Thu Oct 31 07:58:13 UTC 2019


Useful advice, thanks! Actually I had been using foobar2000 to recode, because it just makes it so easy to convert multiple files while keeping the metadata (I confess, I'm a "tagger"). But it's easy to miss some encoder option when being presented some default suggestions in a dialog form...

Apart form that I always had the impression that Opus could be quite smart detecting what the input material is like, especially when I request such a low bitrate, it "could at least TRY speech".

Can you explain the effect of --set-ctl-int a bit more than the manual does?:

--set-ctl-int x=y 
    Pass the encoder control x with value y (advanced). Preface with s: to direct the ctl to multistream s 
    This may be used multiple times 


>>> Mathias Buhr <napcode at apparatus.de> schrieb am 30.10.2019 um 14:32 in Nachricht
<e7036001-c147-c4d0-550c-330331b76f5c at apparatus.de>:
> Hi Ulrich,
> I assume you've been using opusenc to encode the files. If that is the
> case you can try giving the encoder some more hints about your files:
> opusenc --speech --set-ctl-int 4008=1103 ...
> The latter should tell the encoder that the signal bandwidth is 8kHz
> (OPUS_SET_BANDWIDTH). See opus_defines.h for all valid numbers. You can
> also experiment with the complexity settings. 
> -Mathias
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