(X)ubuntu 18.04: firefox : no soundcloud audio

[merlyn]

Ok, don't try it.

[bluebell]

My (and other people's) problems were similar: strange balance with Soundcloud (one channel louder than the other, Pulseaudio outputs to 3(!) channels), but NO problems with Youtube. I am no Pulseaudio expert. Maybe Pulseaudio can be tweaked. Just watch pavumeter when playing Youtube-videos and Soundcloud-clips. Maybe you can see the different channel routing.

I see what you might mean although in this case firefox does not even go to pavucontrol (I do not currently have pavumeter installed) :

When firefox plays something from youtube:

pavucontrol-YT.jpg

When firefox plays something from soundcloud:

pavucontrol-SC.jpg

I'm only commenting as I haven't got the chance to do anything about this yet.

I see a difference on my system. When playing youtube I have the "AudioIPC Server", when playing Soundcloud I have the "AudioCallbackDriver" on pavucontrol.

pavumeter is handy, though, as it shows the number of used channels and the signals in them.