Convert flv video to 3gp

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http://askubuntu.com – I use winff (the GUI for ffmpeg) to convert audio/video to different formats. Yesterday I was trying to convert an flv video to 3gp (so that I could see it on my mobile phone), but it doesn't show the option to convert to 3gp. Are codecs missing in ffmpeg? Do I need to download such codecs from the repositories? Please, help. (HowTos)