Similar problems here on Ubuntu 18.04 with proprietary NV driver. Can't get GPU acceleration working:
Playback [bd74770c]: VS - Script evaluation failed:
Playback [bd74770c]: VS - Python exception: SVSmoothFps: unable to init GPU-based renderer - code 262111
Playback [bd74770c]: VS - Traceback (most recent call last):
Playback [bd74770c]: VS - File 'src/cython/vapoursynth.pyx', line 1847, in vapoursynth.vpy_evaluateScript
Playback [bd74770c]: VS - File '/home/DangerThunder/.local/share/SVP4/scripts/bd74770c.py', line 53, in <module>
Playback [bd74770c]: VS - smooth = interpolate(clip)
Playback [bd74770c]: VS - File '/home/DangerThunder/.local/share/SVP4/scripts/bd74770c.py', line 36, in interpolate
Playback [bd74770c]: VS - smooth = core.svp2.SmoothFps(input_m,super['clip'],super['data'],vectors['clip'],vectors['data'],smoothfps_params,src=input_um,fps=src_fps)
Playback [bd74770c]: VS - File 'src/cython/vapoursynth.pyx', line 1739, in vapoursynth.Function.__call__
Playback [bd74770c]: VS - vapoursynth.Error: SVSmoothFps: unable to init GPU-based renderer - code 262111vapoursynth 43-1
nvidia-driver-390
libnvidia-compute-390
mpv 1:0.28.0-1
python 3.6
CPU-based works fine.