Besides codecs, you also must install other filters such as splitters. One that can splitt MKV and MP4 files (like Haali media splitter) or individual splitters such as Gabest MP4 and Gabest NKV splitter.
So, when installed BSPlayer, did you allow it to install it's own filters (can be used only by BSplayer and don't mix with system ones) ?
If not, open codecmanager.exe from inside BSplayer's install folder and allow instalation for Haali and ffdshow (MPEG4 AVC support - usually requiered in MKV and MP4 files)
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