Visit a trusted source like Free-Codecs.com or VideoProc to download the latest . Do not unzip the file once it is downloaded. Step 3: Install the Codec in MX Player
If updating MX Player does not resolve the issue, you can try enabling eAC3 audio support in the player's settings. Here's how: how to play eac3 audio in mx player
If you prefer not to mess with codecs, switch to a player with built‑in E‑AC3 support: Visit a trusted source like Free-Codecs
Navigate to your folder and select the AIO ZIP file you just downloaded. how to play eac3 audio in mx player
MX Player allows custom to add E‑AC3 support.