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HDR metadata automatically forces your screen to maximum brightness for specific pixels. Ensure that your system brightness is not pinned to an aggressively low manual setting, as some operating systems restrict HDR performance when battery-saver modes are active. Troubleshooting Common MX Player HDR Issues Why are the colors washed out and gray?

The application must correctly read the video stream and pass the metadata directly to the display hardware without compressing the color space (a process known as tone mapping). Hardware vs. Software Decoding for HDR

To help troubleshoot further, tell me you are using, or the file extension of the video you are trying to play. Share public link

Even with everything set right, MX Player HDR support works only under specific conditions. Here are the current limitations: