
here is video tutorial on how to convert Ssa subtitles to Vtt :
If you wish to automate the conversion process or bypass the User Interface (UI) and run the 'Ssa to Vtt' application from the command line,
here is an example of how to do it:"
"C:\Program Files (x86)\WhiterockSoftware\SsatoVtt\SsatoVtt.exe" inputfile.ssa outputfile.vtt

here is video on how to convert Ssa subtitles to text file:
If you wish to automate the conversion process or bypass the User Interface (UI) and run the 'Ssa to Text' application from the command line,
here is an example of how to do it:"
"C:\Program Files (x86)\WhiterockSoftware\SsatoText\SsatoText.exe" inputfile.ssa outputfile.txt