I don't know where you seem to think Avisynth comes into play but if you simply want to OCR bitmap subs to SRT, use Tappen's DVD Subextractor which is far better than Subrip.
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MultiMakeMKV: MakeMKV batch processing (Win)
MultiShrink: DVD Shrink batch processing
Offizieller Übersetzer von DVD Shrink deutsch
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