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Old TV series should have closed captions available (which are apparently different from subtitles), however the question of where to obtain aside from VHS copies them might be difficult.

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And of course, a lot of modern "dvd players" do not properly transmit closed captions as subtitles over HDMI, so that sure isn't helping

A slightly off topic but interesting video about this https://www.youtube.com/watch?v=OSCOQ6vnLwU

Many DVDs of old movies and TV shows may contain the closed captions, but they are not visible through HDMI. You have to connect your DVD player to your TV via the composite video analogue outputs.

This video explains all about it: https://youtu.be/OSCOQ6vnLwU

Yes they need to be "burned in" to the picture to work with HDMI (he shows a couple of bluray players towards the end that do this. there's also some models mentioned in the comments)

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