If you prefer not to tinker with codecs, you can convert the audio track of your video to a format MX Player supports natively, like AAC, MP3, or AC3. Think of this as permanently solving the problem for that specific file.
He followed the instructions.
It sounded like witchcraft. Rahul had never messed with root directories or custom codecs. But the alternative was presenting a silent film about a detective who couldn't speak. eac3 audio format not supported in mx player