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nvcodec: Fix framerate related issues

nvdec: Use upstream framerate if possible

Encoded bitstream might not have valid framerate. If upstream
provided non-variable-framerate (i.e., fps_n > 0 and fps_d > 0)
use upstream framerate instead of parsed one
nvenc: Fix crash with unspecified framerate

Nvidia driver seems to calculating floating point framerate
without validation. This causes crash both on linux and Windows.

Fixes: #1012 (closed)

Edited by Seungha Yang

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