[Bug 680779] pulseaudio: Full volume may raise overall system volume when flat-volume is used

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=680779

--- Comment #6 from Dustin Spicuzza <dustin at virtualroadside.com> ---
I agree that technically, this is NOTABUG for gstreamer.

The thing that caught me was that our app has a volume slider, and didn't
expect that the volume for the sink would change if my app didn't set it
(because the sink volume was assumed to be local to the application). So user
would set the volume to .5, and then the system audio would get set to .2 which
changed the sink volume... well, when the volume got set inside my app to '1
step up', of course it set it to .6, which is of course very disconcerting.

Documenting that this can happen sometime and that app authors need to expect
it would be a very good idea, since it doesn't happen on all platforms. A note
should be added to playbin/playsink AND autoaudiosink/pulsesink.

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