What made me think of this was a documentary I saw years ago called "Hitler's Private World" where they used a lip reader and some video enhancements (I don't exactly remember) to be able to read his lips that didn't contain audio, such as those taken at his private villa. I don't know if what they found was ever vetted for accuracy, but it was quite amazing to be able to use lip reading to try and determine what all was being discussed privately.
I found a copy of it on Dailymotion [1] and a brief description [2]. It's well worth a watch! I always wondered why they didn't use these techniques on other recordings of video that have some mystery surrounding them.
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What made me think of this was a documentary I saw years ago called "Hitler's Private World" where they used a lip reader and some video enhancements (I don't exactly remember) to be able to read his lips that didn't contain audio, such as those taken at his private villa. I don't know if what they found was ever vetted for accuracy, but it was quite amazing to be able to use lip reading to try and determine what all was being discussed privately.
I found a copy of it on Dailymotion [1] and a brief description [2]. It's well worth a watch! I always wondered why they didn't use these techniques on other recordings of video that have some mystery surrounding them.
[1] https://www.dailymotion.com/video/xlvimo
[2] https://m.imdb.com/title/tt1193023/