I’m looking to write a script that is triggered by media playing with the condition of it being a movie. I’m okay with how to write the yaml but I have no idea on the python/appdaemon needed for volume control.
Basically I want the script to loop media_player.volume_up on a certain media player until the volume entity for my lg webos tv is at the target, then quit the script. Any assistance would be great 
Are you trying to achieve a set volume at all times?
Is it the volume of the TV you’re trying to set or a specific player on your TV?
Okay so I have the lg web is tv component added which gives me volume_up, volume_down and volume_set commands. I haven’t had any luck with volume_set. The tv is connected to a home theatre and the Tv sets the volume of the receiver. The tv volume is what I want to control. I was hoping to trigger the automation only when my Chromecast(connected to tv) is playing a movie from Plex.
Can you not do volume down the maximum increments (ie 100% regardless where its at) then volume up whatever amount you want. A bit dirty but will give you a set volume.