[Libav-user] Why we Shell32 library in pkg-config of libavfilter

[anshul]

Hi

Shell32 is an qt library, I would like to know what part of ffmpeg is 
using shell32 library

output of pkg-config --libs libavfilter on windows cygwin
-pthread -L/usr/local/lib -lavfilter -lswresample -lswscale -lavformat 
-lavcodec -lavicap32 -lbz2 -lz -lpsapi -ladvapi32 -lshell32 -lavutil -lm

If any one knows why we use -ladvapi32 and -lpsapi, lavicap32 is also 
welcome
Thanks
Anshul