I had to replace the original speakers, there was no sound and videos wouldn't play--error message appeared linking audio problem with inability to play video.
New speakers don't sound, video freezes up, but everything is fine if I use airpods, as the computer recognizes them as a new audio source
Everything else is ok with the computer
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Sounds like you have two issues here!
The first is a messed up headphone jack MacBook Pro 14" (A2442, A2779) and 16" (2021 A2485) Headphone Jack
The jack also has a set of switches which push the signal between external and internal speakers.
I also think one of your internal speakers has a problem as well.
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