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...ed with libopus 1.3, libopusenc 0.2.1 User comments section follows... ENCODER=opusenc from opus-tools 0.2-3-gf5f571b ENCODER_OPTIONS=--bitrate 56 --vbr --comp 5 ALBUM=Test-Sweeps ARTIST=Audacity COMMENT=60s logarithmic sweep (0-20kHz): 5s=10Hz, 10s=20Hz, 15s=39Hz, 20 s=78Hz, 25s=156Hz, 30s=312Hz, 35s=625Hz, 40s=1.25kHz, 45s=2.5kHz, 50s=5kHz, 55s= 10kHz, 60s=20kHz COMMENTS=60s logarithmisch DATE=2016 TITLE=Sweep (0-20kHz at 96kHz) log TRACKNUMBER=2 Opus stream 1: Pre-skip: 312 Playback gain: 0 dB Channe...

...t problems. Can you please post the original wav? I am not sure what Audacity means by a logarithmisch sweep. Is that a fixed number of Hertz per second (SoX calls that linear)? Or a fixed number of semitones per second (SoX calls that exponantional)? (The ogg comment says 5s=10Hz, 10s=20Hz, 15s=39Hz, 20s=78Hz, 25s=156Hz, 30s=312Hz, 35s=625Hz, 40s=1.25kHz, 45s=2.5kHz, 50s=5kHz, 55s=10kHz, 60s=20kHz so it seems the frequency rises logarithmically.) $ sox -c 1 -r 96k -b 16 -n /tmp/sweep.wav synth 60 sin create 1-20 gain -3 > With Opus I noticed that the file size for 48kHz and 48 kbps > c...

...t problems. Can you please post the original wav? I am not sure what Audacity means by a logarithmisch sweep. Is that a fixed number of Hertz per second (SoX calls that linear)? Or a fixed number of semitones per second (SoX calls that exponantional)? (The ogg comment says 5s=10Hz, 10s=20Hz, 15s=39Hz, 20s=78Hz, 25s=156Hz, 30s=312Hz, 35s=625Hz, 40s=1.25kHz, 45s=2.5kHz, 50s=5kHz, 55s=10kHz, 60s=20kHz so it seems the frequency rises logarithmically.) $ sox -c 1 -r 96k -b 16 -n /tmp/sweep.wav synth 60 sin create 1-20 gain -3 > With Opus I noticed that the file size for 48kHz and 48 kbps > c...

...ols 0.2‑3‑gf5f571b >> >> > ENCODER_OPTIONS=‑‑bitrate 56 ‑‑vbr ‑‑comp 5 >> >> > ALBUM=Test‑Sweeps >> >> > ARTIST=Audacity >> >> > COMMENT=60s logarithmic sweep (0‑20kHz): 5s=10Hz, 10s=20Hz, >> > 15s=39Hz, 20 >> >> > s=78Hz, 25s=156Hz, 30s=312Hz, 35s=625Hz, 40s=1.25kHz, 45s=2.5kHz, > 50s=5kHz, >> > 55s= >> >> > 10kHz, 60s=20kHz >> >> > COMMENTS=60s logarithmisch >> >> > DATE=2016 >> >> >...