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by TD-Linux 4095 days ago
Most consumer sources are also-limited to 8-bit precision. 10-bit encodes from these are made using a fancy temporal debanding filter, which only works in certain cases.

Keep in mind that there is a range expansion when converting to monitor sRGB. Also several video players now support dithering. So the debanding effect can often be quite visible.

Also, x264 benefits from less noise in its references, which means 10-bit gets a small compression performance bump.