Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ

You can get all the IDs using yt-dlp

yt-dlp --flat-playlist --print id <playlist>

Assuming you're on linux, you can add >> ids_all.txt at the end to save the list to a file.

You can also add

--compat-options no-youtube-unavailable-videos

to get only the list of available videos instead and then, again assuming you're on linux, do

diff ids_all.txt ids_available.txt

to get the odd ones out. That's the simplest I could come up with. You'll have to hope you can use the wayback machine, or a good old exact search to turn up what video that ID actually referred to

What I've done in the past is to copy the URL of the unavailable video (if it's still accessible via the playlist entry, sometimes it isn't which is annoying) and feed it into the Wayback Machine in the hopes that it got archived at some point. The video stream isn't usually available that way, but at least the page title sometimes is, and then I can search for other versions of it.

Run yt-dlp against the playlist and look for errors? You can probably filter or script it too, or extract the list items, iterate over them individually, and look for a nonzero exit code.

Thanks guys, let's hope I can figure it out (have only used the DL with GUI)