★★★½ (3.5/5) About the M4B Format M4B is an audio book format (similar to M4A but with chapter markers and bookmarking). If you have Young Sheldon S01E08 as an M4B file, it’s likely a fan-converted audio track from the episode – not an official release (the show is originally video). M4B works great for listening on the go, though you’ll miss visual gags like Sheldon’s corkboard of suspects.
Apple Books, VLC, Audiobook Builder.