You know that because when they release a new format (eg. HDR or a different resolution), they re-encode from the original. Various people have tested that with moire patterns and various other ways to demonstrate if something was encoded more than once.
You know that because when they release a new format (eg. HDR or a different resolution), they re-encode from the original. Various people have tested that with moire patterns and various other ways to demonstrate if something was encoded more than once.