My question on drupal.org did not have an answer: To check if YouTube video exists in all my nodes?
Please yow to do these?
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the quickest solution is to query the DB and export all youtube video IDs. After you can write a custom PHP script to check if the video exists. Here is an example of the code you could use: https://stackoverflow.com/a/21069917
A more Drupalistic approach is to write a custom module which do the same thing. For example it could implement a drupal cron task or a batch procedure to verify each Youtube field content using the code suggested before.
I hope this suggestion will be helpful.