That rather sounds like Le Roi Danse, the adaptation of the amazing book Lully, ou le musicien du Soleil (alas horribly expensive, because of all the color reproductions of the surviving ballet programmes, the designs of the costumes or sets, machines etc.) . It's a biography of Lully written by an art/music historian, so it's doubled by an in-depth study of his works, and of the role and use of the Arts by Louis XIV. It's become the reference book on the Arts at Versailles and their role in the reign. The book is a companion to a (still ongoing - they're at volume 13 or so) edition of Lully's complete works. The book I've perused many time in store, but it's just too expensive. I have a few of the CDs - including some of Molière's plays with their full score (it's Hollywoodian use of music before the letter, really.). Another one I love is a CD of excerpts from Les Trois Mousquetaires mixed with the music Lully wrote for their (the real musketeers, not Dumas's novel of course) entrances, parades, charges etc. - there's little at Versailles under Louis XIV's for which a specific musical score wasn't written. Louis XIV would have loved reality TV (as long as he was its only Star and had full creative freedom mind you)!

Le Roi Danse is considered a very average movie (by the director of Farinelli), but I liked that one. It focusses more on Lully's life and how with Molière and Louis XIV they built from the ground up using the Arts the Sun King mythology.

The Molière movie is older than that. It doesn't have the court or the King much in it. Most of the theater scenes are from the period in which Molière's troupe tried to play tragedies (mostly Racine) -with godawful results, and then from the period he resigned himself that he couldn't make a living as a tragedian and the troupe started touring the countryside for years, mounting Italian farces and their own plays modeled on them. In the period in which he began writing his comedies, attracted the interest of one of Louis XIV's cousins and eventually became Versailles's "metteur en scène", the movie focusses a lot more on his private life and the impact being a courtier had on it.

His plays are what survived, but they were a small part of his role at Versailles as a "conceptual director" of Louis XIV public life we might say today. Interestingly, that part of his work is probably his larger contribution to French culture too, contributing far more to establishing the cultural dominance of France. His theatre itself has nothing of the cultural impact Shakespeare has in English culture (there's really no "national playwright" like that in France, and if there were one it would be Racine, not Molière).