[REQ] Hardsub extraction

[MarcoRavich]

"Extract HardSub" function (under EXPERIMENTAL > FFMPEG 1 section) seems to point old/non-exitent gits:

• https://github.com/fanyange/ocr_video_hardcoded_subtitles
• https://github.com/aritra1999/Video-OCR

Some possible replacers:

• https://github.com/YaoFANGUK/video-subtitle-extractor
• https://github.com/shawnsky/extract-subtitles
• https://github.com/Dinghow/OCR_on_Video
• https://github.com/krohak/Embedded-Subtitles-OCR
• https://github.com/PatchyVideo/MMD-Translator

I don't know wich is better, btw it's a great feature to have in MixLab.

Hope that inspires.

[MarcoRavich]

Another interesting 100% Python script: https://github.com/Abu3safeer/image-ocr-google-docs-srt