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ok, well i'm 100% you don't mean 5 sec's 
i believe you mean 5 milli seconds, anyway my point was if you had a player and used that to adjust sync since it cannot be done on the tv.
its not uncommon for files downloaded to be a fraction out, i have the same issues with some and 5 m/s as annoying as it seems is not as bad as some i've had and almost always with AVI, try finding the files in a different format and see how that goes
