This appears to be caused by a syntax issue in the exception raising line. The string is not properly formatted or completed, and Python interprets it as a function call, which results in a 'str' ...

I am trying to convert Blu-Ray subtitles in an MKV. The actual OCR seems to go ok, because if I select to save a copy of the new subtitles, I get all the .srt conversions. But it can't seem to mux the ...