The Fraunhofer Society is not and never was a "patent troll". They do actual research and one of their income sources is licensing the resulting patents.
Fraunhofer put the source online without a license at the ISO site, let the community convince itself that MP3 was a standard and therefore unpatented, let the community write all the encoders and decoders and surrounding tools for years, then turned around and asked everyone who made their file format popular for 10K USD.
Troll is a gentle word, the author of ffmpeg describe patents of software as "gangsters asking for protection money". All software patents are bad see my reply above