Control volume of your chromecasts through this little gui on your computer of choice, not through the awful google home app. Based on top of the awesome pychromecast lib.
App listens to changes of volume through other apps (e.g. google home) and adjusts sliders.
Tested with chromecast audios only, i do not have others.
TK Python library:
sudo apt install python3-tk
install it from pypi
pip install chromecast-volumecontrol
then, you can use run
$ cc_volumecontrol
to open the gui
Clone and run gui.py, not yet more available, still under development. Dependencies are python3, python3-tk and pychromecast.
Add REST interface for IOT devices controlling the volume via hardware sliders. Currently, flask_endpoint.py is used to allow for some testing e.g. using arduinos with wifi.