MX Player supports HDR playback, but its performance depends on your device's display and the decoder you use. On devices with native HDR support, MX Player can utilize hardware acceleration (HW/HW+) to output the HDR signal directly to the screen
MX Player has been around since 2011, but HDR support arrived late. Let’s look at the timeline: mx player hdr support work
A. Enable HW+ Decoder
If you’ve followed all steps and still get washed-out colors or stuttering, consider these superior HDR players: MX Player supports HDR playback, but its performance
When HDR content became prevalent, the standard HW decoder often struggled because older Android media frameworks did not communicate HDR metadata correctly to the display. To solve this, MX Player introduced and heavily optimized the HW+ (Hardware Plus) decoder. Enable HW+ Decoder Chapter 5: Best Alternatives When