From Martin von Gagern, build fix for latest ffmpeg changes
From Martin von Gagern, build fix for latest ffmpeg changes


ntoand/osg,ghub/osg,koshman86/osg,stmh/osg,XiaoCC/osg,XiaoCC/osg,ghub/osg,ntoand/osg,XiaoCC/osg,ntoand/osg,omega-hub/osg,koshman86/osg,ghub/osg,stmh/osg,stmh/osg,omega-hub/osg,XiaoCC/osg,koshman86/osg,artoolkit/osg,ghub/osg,omega-hub/osg,artoolkit/osg,koshman86/osg,stmh/osg,omega-hub/osg,artoolkit/osg,XiaoCC/osg,ntoand/osg,artoolkit/osg,stmh/osg