Trying to deinterlace with Bob NVEnc; job crashes

[Selur]

but NVEnc does not feature the default nVidia driver adaptive deinterlacer, from what I can tell.

you skipped the '--interlace auto' documentation.

The debug output uses 'bwdif=mode=1' and x264 not NVEnc and '--vpp-deinterlace XX --interlace auto".

It seems like we are speaking of different things.
I looked into using the same deinterlacer as ffmpeg with cuvid '-deint 2' uses while using NVEncC.
While it seems like you want to use ffmpeg as decoder with h264_cuvid and '-deint 2' which are two totally different things.

Cu Selur