First, check if your Android device uses a 64-bit or 32-bit processor. Most modern phones use 64-bit.
If you see an error saying the codec is not compatible, your MX Player application version does not match the 1.49.0 codec file. Check your app version under > Help > About . If your app is newer or older, you must download the exact matching codec pack version or update your MX Player app to 1.49.0. Audio and Video Out of Sync

First, check if your Android device uses a 64-bit or 32-bit processor. Most modern phones use 64-bit.
If you see an error saying the codec is not compatible, your MX Player application version does not match the 1.49.0 codec file. Check your app version under > Help > About . If your app is newer or older, you must download the exact matching codec pack version or update your MX Player app to 1.49.0. Audio and Video Out of Sync