While MX Player has moved largely to "Software Decoding" and "Custom Codecs" (often loaded as .so files) in recent years, the is still required for specific hardware-accelerated playback scenarios.
You might be tempted to download the first "ARMv8 NEON" codec you find. Do not do that. Versioning is critical. mx player codec armv8 neon 1490 download exclusive
: Seamlessly enables playback for EAC3, AC3, DTS, MLP, and TrueHD audio tracks. While MX Player has moved largely to "Software