Download from Free-Codecs or MXPlayer.app .

Guide to Installing MX Player Custom Codec 1.49.0 for ARMV8 NEON

If version 1.49.0 doesn't work, verify your device architecture in the "Custom codec" settings tab. It will tell you exactly which one you need (e.g., "Use ARMv8 NEON type custom codec"). Summary of Compatible Formats

If the app doesn't automatically find the file, use the Manual Navigation method described in Step 2.

Ensure you haven't unzipped the file if you are using the automatic detection method; MX Player typically prefers the raw ZIP file. However, if it still fails, some users report success by unzipping the folder first and then selecting the .so file manually.