Avoid silently wrong results on 10bit CUDA #777
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Addresses #736 and #598.
Some 10bit videos are properly decoded by NVDEC, but are passed as-is to the NPP color conversion functions, which expect 8bits videos. This results in garbage output. This PR adds a check to prevent such incorrect conversion. It does not add support for 10 bit videos on CUDA. It just avoids silently wrong results.