Working without problems overhere. (WinXP SP3 - BS.Player Pro 2.57.1051)
When you installed BS.Player, did you allow it to internally
(i.e. for use by BS.Player only and not interfering with your system's codecs/filters)
install its preferred codecs/filters?
Which filters/codecs does BS.Player actually use for playback of your video? To find out:
(rightclick >) Options > Filters > Advanced
Please also click on "Source" and on the small [+]-signs in front of the filters/codecs shown in order to reveal further info (and access).
If you're really in a great hurry for your project, you could perhaps meanwhile try the old 2003-version 0.86.501 (click here for
my old Help2Help-post).
[In this connection note the actual 2.57.1051 version and the old 0.86.501 version don't bite eachother, though I must admit I don't know how the old version behaves under Windows 7.]