Fix for new ffmpeg.
Fix for new ffmpeg.

svn path=/trunk/libavg/; revision=5642

hoodie/libavg,libavg/libavg,scotty007/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,yyd01245/libavg,libavg/libavg,scotty007/libavg,libavg/libavg,scotty007/libavg,libavg/libavg,hoodie/libavg,th3infinity/libavg,th3infinity/libavg,yyd01245/libavg,hoodie/libavg,th3infinity/libavg,yyd01245/libavg,scotty007/libavg