The first version of the "Vetinari" branch, VLC 3.0.0 is capable of streaming to Chromecast devices even in non-native formats, also supporting 4K and 8K hardware decoding on a wide range of devices, including Android flagships.
https://www.notebookcheck.net/VLC-3-0-now-available-with-8K-and-Chromecast-support.281974.0.html
one and only, the best.
I can finally agree again with this. Dunno if the best for audio or video, but most likely the best all-arounder with support for all major platforms.