[Python] How to correctly pass Windows path with spaces to FFmpeg -vf ass filter in Python?

ass_path = r'C:\Users\username\Desktop\Title Of Video.ass'
command = [
'ffmpeg',
'-i', mp4_path,
'-vf', f"ass='{ass_path}'", # Embed the full path in the filter string, with single quotes
'-c:v', 'libx264',
'-c:a', 'copy',
output_path
]


In the error message I'm getting this message: Unable to parse option value "UsersusernameDesktopTitle Of Video.ass" as image size. Somehow in the command it's stripping the \ away and removed the C:

Does anyone know how to fix this? Thanks.

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