[opus] Opus Tools -- low bitrates, new features in 1.5, "expect-loss"

[Petr Pařízek]

 > What sine sweep exactly?

An exponential sweep. It started slightly below 24 Hz and ended almost 
at 24 kHz. And it was 50 seconds long.

 > How did you obtain it,

I used Angelo Farina's "Aurora" modules. One of them is called "Generate 
sine sweep".

 > and how exactly did you encode and decode it?

1) Opusenc --bitrate 12 --downmix-mono Sweep50.wav Sweep50.opus
2) Opusdec --float Sweep50.opus Sweep50out.wav

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Petr