[opus] Opus 1.5.2 low hum in input file results overblown output at decoding

[Petr Pařízek]

There was a post in the Opus subthread on HA where there was a link to 
the file called
Opus-tools-0.2-34-g98f3ddc_(using_libopus_1.5.2-21-gff6dea5)_Win_GCC142.7z.
That's the one I'm currently using.
First, I used GoldWave to convert your input file from µ-law to PCM and 
saved it as a ".wav" file.
Next, I encoded it with Opusenc, I decoded its result with Opusdec with 
the target sample rate being set to 48 kHz, and I got no excessive 
amplification.
Not sure what's taking place on your side.

Petr