I normally grab a #youtube video via #invidious onion instances this way:
yt-dlp --proxy http://127.0.0.1:8118 -f 18 http://ng27owmagn5amdm7l5s3rsqxwscl5ynppnis5dqcasogkyxcfqn7psid.onion/watch?v="$videoID"
Now it leads to:
ERROR: [youtube] $videoID: Sign in to confirm you’re not a bot. This helps protect our community. Learn more
There used to be a huge number of Invidious instances. Now the official list is down to like ½ dozen.
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same happens if I try my stupid method:
torsocks yt-dlp <INSERT-CLEARNET-LINK-HERE>
Also gives me your error. But your method seems more secure, since it only goes over onion sites …