This is no info which is displayed by BS.Player itself, but by the filter/codec it uses.
You can check which this is under
(rightclick >) Options > Filters > Advanced
and from there you most probably can also access that filter's settings to switch off this OSD message, which annoys you.
(Most probaby it concerns ffdshow, in which case you can find the "switch"
under "Advanced" as indicated above and then > ffdshow Video decoder > OSD ... )