Increasing the colorspace and bitrate can help with dark detail. But you'll have bigger files and higher bitrates. When I screen capture I use yuv444p since anything less and yellows become some cream like color. When I view content with a lot of darks, I often adjust xrandr to fiddle with brightness and gamma. Depending on the display device, brightness at about 0.7 and gamma at about 1.2:1.2:1.2 plus or minus. The values vary depending on the display device. Some libxca routes too if you have calibration values for your display.
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