For version 1.49.0 , you should look for the corresponding codec pack to ensure compatibility.

Ensure MX Player has storage permissions set to "Allow all the time" instead of "Only when using app".

Compatible with ARM, ARM64 (ARMv8), x86, and x86_64 architectures.

Installing the wrong codec can cause stuttering playback or app crashes. To ensure you actually need the variant:

(These steps assume the distributor provides a checksum or signature; if none is provided, at minimum verify file hash and source reputation.)

In simpler terms: If you have a smartphone or tablet manufactured in the last several years (running a 64-bit CPU), the ARMv8 NEON codec is likely the optimized package that allows MX Player to decode video streams using the hardware's native instruction set. This ensures smoother playback, less battery consumption, and support for high-definition formats (like HEVC/H.265) that the standard app might struggle with.