or
Standard MP4 files often use the H.264 (AVC) codec. Newer or custom configurations (like those potentially used in a "sone385" variant) may leverage H.265 (HEVC) or VP9.
But better at what? Better than which chip? And most importantly — can your ears actually hear the difference?
extension), here is a quick breakdown of why that format is generally considered "better" for most users: Universal Compatibility