i've try this method using autosub for a while, but the accuration only arround 40-60% depend on the audio & the bgm (more bgm = more noise = less accurate)This will get you started https://www.akiba-online.com/thread...ed-subtitles-of-movies-japanese-easy.1683427/
what i'm curious about is the method that is use to extract subtitle from chinese hardsub version
cause sometimes i'm stumble upon chinese softsub in Cat, this one have more accurate even if we use machine TL to TL in from Ch to En