MX Player will show a dialog: “Custom codec loaded successfully. Restart the app to take effect.” Force-close MX Player (swipe it away from recent apps) and reopen.
A codec (coder-decoder) is software that compresses or decompresses digital media. While MX Player supports many formats out of the box, some audio codecs—especially and DTS (Digital Theater Systems) —are excluded from the official version due to licensing restrictions. This is where the custom codec steps in. By manually loading the custom codec file, users restore playback for these formats, enabling full audio in MKV, AVI, and other container formats commonly found in downloaded movies or TV shows. Mx Player Custom Codec 1.49 0 Armv8 Neon