[puidon]

What I mean codec-independent is that it does not need installation of codec
if there is suitable codec file under filters folder, then it can play the avi file

In my testing, it is not.
I cannot play divx4 or upper version of avi even I place a divxdec.ax under
the filters folder and modify the bspfilters.dat with
AddFilter divxdec.ax,{78766964-0000-0010-8000-00AA00389B71},Divx Decoder Filter

I cannot use ffdshow filter also without installation.
I have specify
DIV3={04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder
DIV4={04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder
DIVX={04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder
and
AddFilter ffdshow.ax,{04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder

Is my FilterGUID incorrect? I'm not sure because I have search my registry and find out there is different FilterGuid with the name ffdshow

Last question, is there any internal list for bsplayer to know which filter to
use with some kind of FourCC code? e.g. divx 3 beta?

If I place DIVX_c32.ax under filters folder, it can play divx3 file.
however, if I rename DIVX_c32.ax, bsplayer said DIVX3:unknown file format
so I wonder how bsplayer know how to load which filter dynamically?