Seems like I'm running into a similar error. Until my most recent update, svp was working perfectly. I tried uninstalling the aur package and installed it with the tarball provided here, but it made no difference. I'm using mpv-full-git 0.32.0.r813.g26fc70dbfd-1 and vapoursynth-git R52.14.gc7cc7b95-1, running arch on kernel 5.9.8-zen1-1-zen #1 ZEN SMP PREEMPT. Here's the error:
❯ mpv the.new.pope.s01e01.1080p.bluray.x264-ouija.mp4
(+) Video --vid=1 (*) (h264 1920x1080 25.000fps)
(+) Audio --aid=1 --alang=eng (*) (aac 6ch 48000Hz)
Using hardware decoding (nvdec-copy).
[ao/pulse] The --audio-stream-silence option is set. This will break certain player behavior.
AO: [pulse] 48000Hz 5.1 6ch float
VO: [gpu] 1920x1080 nv12
AV: 00:00:00 / 00:58:43 (0%) A-V: 0.000 Cache: 170s/150MB
[autoconvert] Converting nv12 -> yuv420p
[vapoursynth] Script evaluation failed:
[vapoursynth] Python exception: SVSuper: invalid 'params' syntax: * Line 1, Column 2
[vapoursynth] Missing '}' or object member name
[vapoursynth]
[vapoursynth]
[vapoursynth] Traceback (most recent call last):
[vapoursynth] File "vapoursynth.pyx", line 2244, in vapoursynth.vpy_evaluateScript
[vapoursynth] File "vapoursynth.pyx", line 2245, in vapoursynth.vpy_evaluateScript
[vapoursynth] File "/home/bt/.local/share/SVP4/scripts/c93e5595.py", line 56, in <module>
[vapoursynth] smooth = interpolate(clip)
[vapoursynth] File "/home/bt/.local/share/SVP4/scripts/c93e5595.py", line 37, in interpolate
[vapoursynth] super = core.svp1.Super(input_m8,super_params)
[vapoursynth] File "vapoursynth.pyx", line 2069, in vapoursynth.Function.__call__
[vapoursynth] vapoursynth.Error: SVSuper: invalid 'params' syntax: * Line 1, Column 2
[vapoursynth] Missing '}' or object member name
[vapoursynth]
[vapoursynth]
[vapoursynth] could not init VS
Disabling filter vapoursynth.00 because it has failed.