Error 0xc0000005 is Access Violation, error in code somewhere, can happen where eg trying to read data from a memory pointer of 0.
Not 100% certain that problem resides in ffmpeg or VSFilter, but are most suspect culprits (VSFilter is favourite suspect).
Try with alternative VSFilter if possible (I have experienced bad versions of VsFilter with crashes, some versions are described as depricated or bugged),
or use some other subtitler.
EDIT: Here Pinterf version VSFilter from 2018, I have not tried it before(was not aware of it):-
https://github.com/pinterf/xy-VSFilt.../tag/3.2.0.802