The screen darkening when playing HDR videos in the Gallery of the Xiaomi Pad 7 Pro is due to changes in video synthesis scheduling strategies. When playing HDR content, the device adjusts the display effects to provide enhanced contrast and brightness, which can cause temporary variations in how the video is displayed, particularly during transitions between scenes or different lighting conditions within the video.
This darkening effect is a normal part of the process when handling HDR video and is intended to ensure optimal display quality, as HDR content requires fine-tuned brightness and contrast adjustments. It does not affect the overall HDR viewing experience, and the display will return to its regular brightness once the transition is completed.