Istanbul works well under linux. The thing is to transform the obtained ogg file into avi format you need install mencoder.
Here is the way:
mencoder 1.ogg -o 1.avi -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=800 -oac mp3lame
Now actually ffmpeg can also do this in a simpler way: ffmpeg -i 1.ogg 1.avi