hints to use ffdshow without installation
 

Below are some hints to solve error message:
"Unknown file format : "

I've found out that three elements is need to use ffdshow without installation :

in bspfilters.dat :
1.
[BSPlayer filter def file]

AddFilter ffdshow.ax,{04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder

2.
[Video]

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
DX50={04FE9017-F873-410E-871E-AB91661A4EF7},ffdshow MPEG-4 Video Decoder

3. in registry
[HKEY_LOCAL_MACHINE\SOFTWARE\GNU\ffdshow]
"xvid"=dword:00000001
"div3"=dword:00000001
"divx"=dword:00000001
"dx50"=dword:00000001

forgot to mention two obvious but important thing:
1. place ffdshow.ax in filters directory
2. place libavcodec.dll, libpostproc.dll under bsplayer directory