You're looking for information on the Mx Player 1.13.0 Armv7 Neon Codec. Here's what I found:
Resolves missing audio codecs (AC3/DTS) in older MX Player builds. Works only with v1.13.0 – not for newer releases. Mx Player 1.13.0 Armv7 Neon Codec
Install the 1.13.0 APK as you would any normal application. Open it once to generate the necessary data folders, then close it. You're looking for information on the Mx Player 1
The Mx Player 1.13.0 Armv7 Neon Codec plays a vital role in the overall performance and capabilities of the Mx Player media player: Core Component : The codec is an integral