debugging mingw packages

hi, anybody has ever debug mingw pacakges? unfortunately it seems our gstreamer-ffmpeg always segfault, but we don't know why. so we try to debug. but we always got the same error from gdb: ------------------------------ warning: the debug information found in "c:\Program Files\Vidux5\gstreamer\lib\gstreamer-0.10\libgstffmpeg.dll.debug" does not match "c:\Program Files\Vidux5\gstreamer\lib\gstreamer-0.10\libgstffmpeg.dll" (CRC mismatch). ------------------------------ we rebuild it we sure that we use the right debuginfo packages so what can be the problem? and how can we debug anything? thanks. regards. -- Levente "Si vis pacem para bellum!"