Global state in the libraries is something we absolutely try to stay away
from, so this approach is not quite appropriate.
If you want to somehow share this, it should be in the ffmpeg command line
tool somewhere, however we also try to reduce hardware specific magic in
favor of abstractions.
This shouldn't need any hardware specific magic, just setting the
hw_device_ctx on all nvenc instances. Which is something that could be
done entirely hardware independent quite easily.
Like, set the hw_device_ctx wherever applicable if "-hwaccel something"
is set.
I wonder though, what happens in the case that one explicitly wants to
use multiple GPUs? I guess in that case using an explicit hwupload_cuda
might be a workaround?
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