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nvenc: Avoid extra bitstream buffers allocation

Submitted by Kyrylo V. Polezhaiev

Link to original bug (#756636)

Description

Bitstream buffers allocation is very expensive operation. We shouldn't use 32 / 48, as this gives us no performance boost but makes initialisation take 2 seconds of whole CPU / memory bus, adds unacceptable latency and other operations should wait.
For shorter videos this makes nvh264enc less performant than x264enc.