When you installed BS.Player did you allow BS.Player to download and (internally, i.e. for use only by BS.Player, not interfering with your system's general codecs/filters) install its preferred codecs/filters?
When playing such file, what is shown (especially Source and Video-related, if any) under
(rightclick >) Options > Filters > Advanced
(Note: for further access and info you should click on the small [+]-signs in front of the filters/codecs).