Both video were recorded and processed under the same procedure, and then one video went through Youtube’s audio removal while the other didn’t. The source was recorded from AV cables, so there are obviously noise from that plus artifacts of the audio compression among other things.
As you can see, even though the foreground effects become somewhat muffled, Youtube was able to remove the artifacts of the background music completely. I think the result is amazingly good because I can still hear everything in the foreground perfectly. What kind of audio processing did Youtube use to achieve that result?
Obviously Youtube has the source music track in their hands so they were able to match the content ID, so how do they use that to filter out my background music?
If you are wanting to circumvent YouTube’s anti-piracy policy, then we are not able to help you. Youtube have various methods of combating piracy because using copyrighted music / video without the copyright holder’s permission is illegal in many of the countries in which YouTube operates.
If you are interested in the technical details of how YouTube operate, it would be more appropriate to ask them (https://www.youtube.com/t/contact_us) rather than us. At best we can only speculate about what techniques they may use.
I am thinking about the opposite of circumventing the copyright policy. I’m thinking it would be awesome if YouTube would help someone comply - by filtering some copyrighted music from the background of a video where they didn’t notice it, but the copyright algo catches it. Like if I’m getting video of my friend on the street, but someone is playing a radio loudly in the background. It would be really great if you could select “remove copyrighted audio” - and have it filter for just that.