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manpage: adjust dxva2 description

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wm4 2016-05-23 23:46:58 +02:00
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9
DOCS/man/options.rst
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@ -656,9 +656,12 @@ Video
either BT.601 or BT.709, a forced but correct RGB conversion is
performed. Otherwise, the result will be incorrect.
``dxva2`` is not safe. It uses either BT.601 or BT.709 for forced RGB
conversion, and which colorspace is used is driver-dependent. This can
give incorrect results even with completely ordinary video sources.
``dxva2`` is not safe. It appears to always use BT.601 for forced RGB
conversion, but actual behavior depends on the GPU drivers. Some drivers
appear to convert to limited range RGB, which gives a faded appearance.
In addition to driver-specific behavior, global system settings might
affect this additionally. This can give incorrect results even with
completely ordinary video sources.
All other methods, in particular the copy-back methods (like
``dxva2-copy`` etc.) are either fully safe, or not worse than software