https://en1.onlinevideoconverter.pro/30/youtube-video-downloader

https://downsub.com

fmpeg -i BroadE_\ GATK\ -\ Introduction\ to\ Variant\ Discovery.mp4 -vf subtitles=01.srt output.mp4
ffmpeg -i test_1280x720_3.mp4 -i test_1280x720_3.srt -c copy output.mkv

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https://chrome.google.com/webstore/detail/enjoy-learning-languages/cnppaiifcooegmendcabeagbgnhhjoea?hl=en

https://chrome.google.com/webstore/detail/language-learning-with-ne/bekopgepchoeepdmokgkpkfhegkeohbl?hl=en