Fixed threaded=False playback for videos with broken framerate entries in file.
Fixed threaded=False playback for videos with broken framerate entries in file.

svn path=/trunk/libavg/; revision=9229

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