Opera in German: Ariane à Naxos de Strauss (subtitles available)
Opera in German: Ariane à Naxos de Strauss au Festival d’Aix-en-Provence. Watch it here, available until Oct 7, 2019. Aften accessing the video, click on the wheel to see subtitles in many languages.
Here is more about Ariane à Naxos.
Here is the main opera page.
I hope you enjoy it.