Comment 1 for bug 1611511

Hey. I've found a script that will do what you want.

First you need to go to https://gist.github.com/pylover/d68be364adac5f946887b85e6ed6e7ae#file-a2dp-py and copy the script. Then save it with the name a2dp.py and give execute permissions.
Now connect your BT headset, just connect it and run the script.

If right click > run doesn't work, open a shell in the folder you saved the script and type: python3.5 a2dp.py