I'm backing up my Youtube favorites locally since 2018, so far 10k videos. I might try to use this because seems like would be a fun way to play them in the background on a second monitor.
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I just parse the URLs from the liked playlist every couple of days with a Chrome extension then simply run the app.
yt-dlp would work automatically too with logins but I'm always too nervous that Google would just straight up ban my account for whatever reasons. So I rather do it in a more manual way.