Lately I am using the Copyfish Chrome extension for help with Chinese subtitles/images. The very nice thing about it is that it plays nice with the Zhongwen dictionary, which is another essential Chrome extension for Chinese learners.

https://chrome.google.com/webstore/detail/copyfish-%F0%9F%90...

Before that I was using the "Chinese Subtitle Translator" software: https://ocr.space/blog/p/chinese-subtitles-translator.html (Source code at https://github.com/A9T9/Chinese-Subtitles-Translator )

It uses Microsoft OCR and gets very good results.