Chiming in to say I've got this issue too.
Found that it only works on videos with 1920x800 or 2560x1440 resolution for me, otherwise it crashes the player app. x264, x265 and HDR work at 800p. Anything different, even 1920x804, 1916x800 or 1920x696 crashes it.
As said above, ncnn works fine, TensorRT crashes.
Using a 3060 Ti with MPC-HC and MPV
Edit:
As mentioned in the RIFE megathread, seems to be with the model divisable by 16 mismatch to source
Transcoder log: VapourSynth encountered a fatal error: Filter SVSmoothFps declared the size 1920x1088, but it returned a frame with the size 1920x1080