A: HW+ uses a mix of CPU and GPU. On flagship Snapdragon 8-series chips (2023+), it sometimes works. On MediaTek or Exynos chips, it usually fails.
A: Go to MX Player Settings → Decoder → Enable "Use HW+ for local files" and then disable "HW audio" under the Audio settings section. Some devices require manual toggling. Conclusion The error "EAC3 audio format not supported in MX Player" is not a bug – it is a licensing limitation. Fortunately, you now have multiple ways to solve it.
ffmpeg -i input.mkv -c:v copy -c:a aac -b:a 256k output.mkv This copies the video untouched and re-encodes the audio to AAC.
If you are a fan of high-definition media playback on your Android device, you have likely encountered the frustrating error message: "EAC3 audio format not supported."