Converter ogv para

• AVI:
  mencoder -idx input.ogv -ovc lavc -lavcopts vcodec=mpeg4 -oac mp3lame -o output.avi
• FLV:
  mencoder -idx input.ogv -ovc lavc -lavcopts vcodec=mpeg4 -oac mp3lame -o output.flv
• FLV2:
  mencoder -idx arquivo_de_entrada.ogv -ovc lavc -oac mp3lame -o arquivo_de_saida.flv

-oac specifies the audio codec, here mp3lame, you can then add -lameopts to specify details about how the mp3lame codec will perform

-ovc specifies the video codec, here avcodec (lavc), you can then add -lavcopts to specify details about how libavcodec will perform (here i added vcodec=mpeg4)