Preferred is certainly
NO codec
pack, but individually installed codecs/filters.
What's preferred by BS.Player's developpers is that - upon installation of BS.Player - you allow it to download and "
internally" install its preferred filters/codecs. "
Internally" meaning that these filters/codecs are only installed for exclusive use by BS.Player and will not interfere with your system's codecs/filters.
If you didn't allow so at BS.Player's installation, you can also do it later by executing "codecmanager.exe", which can be found inside BS.Player's installation folder.
(It will install ffdshow, FLV-splitter for flash video, mpeg2 decoder, Haali media splitter, RealMedia splitter and AC3 Filter.)