png2theora segfaults on invalid options
Run "png2theora --framerate-numerator" or "png2theora --framerate-denominator"; these will segfault (at least they do on my system), while "png2theora -f" and "png2theora -F" do not. This is due to incorrect handling of long options. The same goes for the long options "--aspect-numerator" and "--aspect-denominator".