[Bug 759742] Running multiple nvenc encoders in the same pipeline causes very high CPU load during initialisation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759742

--- Comment #4 from Matthew Marsh <matt at stonethree.com> ---
After some testing, it appears that the only methods that need to be statically
locked to prevent the CPU spike are

NvEncCreateBitstreamBuffer

and something in the initialize_encoder method. 

I read through the NVENC docs as well, but they don't seem to mention any need
to do this, so I'm not sure why the fix works... For now I am just happy that
it does.

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