Avisynth+ is recommended now
https://github.com/pinterf/AviSynthP...s/tag/r2772-MT
If you google "dgdecode" the first page has all the info you need
http://avisynth.nl/index.php/DGDecode
And for DirectShowSource you dont need dgdecode at all (you can delete this line)
Subtitle Edit
https://www.nikse.dk/subtitleedit/ has great OCR support (via tesseract). You should try it.