I downloaded a lot of videos from YouTube and uploaded them to my hosting. Can Googlebot-video can detect that my video is duplicate?
Can Googlebot detect duplicate video content?
duplicate content;googlebot;video
We know that Google has technology to detect duplication within video.   They use an algorithm at YouTube to detect when any uploaded video uses a copyrighted song.  While I haven't heard of any specific cases of Google using video duplication detection other than that, it would not surprise me to learn that they do so.   Google would want to detect duplicate video content the same way that they detect and penalize scraped text content for ranking purposes.  Google does not publicize most of the algorithms and techniques that they use.Copying content onto your website without permission is not a good way to build your website.   Google will deindex sites manually for this.   It could also make you vulnerable to legal action from copyright holders.