(1)
You can check which codecs/filters BSPlayer is actually ising for a specific video-file, by loading that file and then ...
... rightclick > Options > Filters > Advanced
Clicking on 'Source' and on the small [+]-signs in front of the codecs/filters shown will reveal further info and access.
(2)
You can manage which filters/codecs BS.Player should (either not of preferably) be utilizing, by uning BS.Player's Filter management: ...
... rightclick > Options > Preferences > Filter management.. etc.
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(If you're planning to use DivX6 or 7, be aware that these
(bloated) codecs may well be not working and/or causing problems; also they cannot decode several other types of video, contrary to ffdshow, which has a much wider scope of operation.)