this post was submitted on 17 Sep 2023
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That's YouTube's processed video not the original.
That 1:1 conversion through the same codec is very likely lossy. However that's not a straight file copy which is what you originally said causes degradation.
I jumped in to point out the flaw in the YouTube experiment you're referring to.
Imo, an easy way to remove YouTube's postprocessing from the equation would be to copy a video file to and from a nas or other computer several times and compare it with the untouched file.
No, this is because YouTube compresses every file before distributing it. This happens even when downloading on the creator side.