I already reported this issue to the AzuraCast developers
(https://github.com/AzuraCast/AzuraCast/issues/1459) but after some
investigation, their project manager told me that probably there's something
wrong in Liquidsoap so I should report the issue here.
On my VPS, I'm using AzuraCast suite and running a couple of radio stations,
currently mainly for the purposes of testing and checking out what AzuraCast
has to offer. All of my stations use Liquidsoap and ALMOST all audio formats
work very well, except OPUS.
I noticed a strange problem with OPUS streams. There appears a distortion which
makes them sound like they were badly resampled from 44100 Hz to 48000 Hz
without proper filtering. I recorded a sample to illustrate the issue:
left channel: OPUS 192kbps, 48000 Hz
right channel: MP3 128kbps, 44100 Hz
In the left channel, the distortion is very clearly audible, especially with
sibilants.
[Untitled.Session.2_mixdown
(1).zip](https://github.com/savonet/liquidsoap/files/3109743/Untitled.Session.2_mixdown.1.zip)
I also did a couple of other tests, among others, I was experimenting with
changing sample rate in liquidsoap.liq. I changed samplerate from 48000 to
24000, then I changed permissions in order to prevent the file from being
overwritten when Liquidsoap is restarted, and I restarted Liquidsoap. Audio
bandwidth was cut to 24000 Hz, of course, but the distortion was still there.
Another test included creating two streams, one in OGG and the other in OPUS:
OGG: https://s.paranormalium.pl/radio/8020/ogg
OPUS: https://s.paranormalium.pl/radio/8020/opus
Audio bandwidth of the file being played by AutoDJ is 8000 Hz. In OGG stream
the sound is clear, whereas in OPUS stream a heavy distortion is clearly
audible.
I also tried playing files with sample rate of 48000, however, no success, the
distortion was still present.
The distortion is present all the time in all OPUS streams I create.
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