Scroll down to the very bottom and look for the section.
To fix this, you need an external codec pack. For older or budget Android devices, the is the exact software component required to restore full audio and video functionality. What is the ARMv7 NEON Codec? Mx Player 1.13.0 Armv7 Neon Codec
Defines the CPU architecture (common in older/budget Android devices). Scroll down to the very bottom and look for the section
Understanding the MX Player 1.13.0 ARMv7 NEON Codec: Installation and Optimization Guide Snapdragon 400 series
Takes advantage of dual-core, quad-core, and even older octa-core ARMv7 CPUs (e.g., Snapdragon 400 series, Samsung Exynos 4412, MediaTek MT65xx series).
a specific custom codec to fix audio issues like "EAC3 not supported"? MX Player - 4PDA
