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

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9229 44470bb9-56e9-0310-a0f8-c586564d3dc6
Reverted last bogus commit.

git-svn-id: https://www.libavg.de/svn/trunk/libavg@9230 44470bb9-56e9-0310-a0f8-c586564d3dc6