In the last update, MX Player APK removed some of the custom codec files from the app because of licensing issue. Due to this, whenever you play a video or movie on your device using an MX player, you won’t be able to hear the audio files. Or, a message will be displayed saying ‘Audio format (AC3) is not supported’ on your screen. This will result in your video playing but with no audio. Fortunately, this problem can be rectified. You do not have to search for any other media player on your Android devices to watch your videos.