> Does it write the video codec tag per frame, etc?
Not even, It’s per sample, iirc, but
> I ask because I'm seeing some truly abnormal results with hevc_nvenc when
> the -tag:v hvc1 option is passed where the CPU load spikes up significantly.
hvc1 is the one with codec params in the sample description box, so I guess 
it’s parsing (basically decoding, as I’ve been told) the stream to copy it to 
the header. (Or box, I should say, rather. And I’m not sure if it also deletes 
them after, but I’m pretty sure there’s a separate bsf that does that though.)
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