Keep MX Player 1.86.0 for its UI and subtitle gestures. But for anything with an E-AC-3 label, keep VLC in your back pocket. One app plays the container; the other respects the codec.
Complete Guide to EAC3 Codec for MX Player 1.86.0 The core media player relies on a stock FFmpeg library that excludes Dolby Digital Plus (EAC3) and DTS formats to comply with global patent laws. Resolving this issue requires downloading a matching custom FFmpeg compilation and linking it manually inside the application's decoder settings. Why MX Player 1.86.0 Drops EAC3 Audio eac3 codec for mx player 1.86.0
For the preservationist or the home theater hobbyist, this is a betrayal. For the corporate entity, it is a calculated risk. Until a fork emerges or a court invalidates software audio patents, Keep MX Player 1
If E-AC-3 decoding failed, users often relied on the audio track selection feature to switch to a secondary audio track (often AAC or MP3) included in the video file, provided the file was not a raw Blu-ray rip with only an E-AC-3 track. Complete Guide to EAC3 Codec for MX Player 1