The original upload might have had audio that was slightly out of sync with the video.
In the context of video releases, the term usually refers to a secondary update made to the file after its initial release. This can happen for several reasons: oldboy2013720pblurayx264850mbvegamoviesn patched
If a file was corrupted during the initial encode, a patch ensures the full runtime of the movie is present. The Movie: Oldboy (2013) The original upload might have had audio that