For devices (most modern 64-bit Android phones), you need a specific file. While many users opt for the "All-in-One" (AIO) pack for simplicity, you can also download the specific architecture zip.
: Ensure the custom codec is compatible with your device's architecture (ARMv8) and MX Player's version.
The root cause of this error is a licensing dilemma. Starting from MX Player version 1.7.32, the app's developers were forced to remove native support for several popular audio codecs due to licensing restrictions and patent laws. The most notable of these are Dolby Digital (AC3), Enhanced AC3 (EAC3), DTS (Digital Theater Systems), and MLP (Meridian Lossless Packing).
MX Player remains one of the most popular media players for Android due to its powerful hardware acceleration and support for various video formats. However, due to licensing issues, certain audio codecs like AC3, DTS, and EAC3 are not natively included in the standard app updates.