There is hope, we can still use MSYS's default gcc 3.4.5 for building ffmpeg, making the MinGW build setup much easier. Yes, its in japanese, but we can all understand the universal language of "command line".
http://feather.cocolog-nifty.com/weblog/2009/04/msys-mingw-gcc3.html
Then again, it might be worthwhile to try the gcc 4 called "Testing"
http://sourceforge.net/project/showfiles.php?group_id=2435
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'You people have such restrictive dress for women,’ she said, hobbling away in three inch heels and panty hose to finish out another pink- collar temp pool day. - “Hijab Scene #2", by Mohja Kahf