Due to licensing, MX Player removed AC3 support after version 1.7.x. On 1.26.6, you will have no sound for AC3 audio tracks. Workaround: Convert the audio track to AAC using PC software (like HandBrake) or use a dedicated audio re-encode tool on the phone.
Compatibility Focus: Legacy Devices (Android 4.4.2 - API 19) mx player apk download for android 4.4.2
However, none match MX Player’s combination of gesture controls (swipe for brightness/volume) and multi-core decoding on KitKat. Due to licensing, MX Player removed AC3 support