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Overrides the automatically selected Device Pixel Ratio
This allows a user to override the automatically selected Device Pixel Ratio value. It is often either 1 or 2 by default, depending on your display's DPI setting.
An accurate DPI value is important for calculating the correct requested resolution of a video. For high density displays, you'll want to have a higher resolution of video, especially in the case of the Electron Capture app, where the reported resolution isn't the same as the displayed resolution.