This is a simple program that emits a json with artist or title info you can use in waybar. Additionally you can let it auto-pause media players you provide, f.e. starting a video in your browser will pause spotify.
pww -a firefox,spotify will autopause watching both Firefox and Spotify.
pww -w spotify:title will emit a json with the current spotify title and the Spotify status as a class. so {"class": "Playing", "text": "Some Title"}
Additionally a -p flag can be provided to specify a placeholder for empty text. F.e. when the player isn't running.