Nautilus think, that all files with suffix *.ogg is Ogg Vorbis Audio. But not
*.ogg files are Audio. Some of them are Video.

For example: I have 2 files. First one is foo.ogg: Ogg data, Theora video;
Second one is bar.ogg: Ogg data, Vorbis audio;

But both files are opened by defined media player, for me it's
beep-media-player, which cannot play video files. It will be better to make a
difference between audio/video ogg container.