I just checked out my adult websites and videos from the RedTube are working. Porn tube sites often do some changes and break some code, so such issues may happen, but I am not sure why it does not work on your site and on others work. Let’s wait a bit longer to learn more about the issue.
I also have an error with redtube. Today i got https installed to solve AMP issue, but when i checked, all the videos gave the error that either network failed or format is not supported, I thought it could be this issue, but i’m not sure now.