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I don't think that setting a high bitrate on a conversion from a file that's already lossy, and probably encoded at low-quality too, is going to do all that much to help the sound. The best it can do is help avoid further degradation.
However, since the majority of flv files have their audio in mp3 format already, a simple "-acodec copy" in ffmpeg or -dumpaudio in mplayer (see post #11) is probably all you need to use to rip it out of the flv container. This will give you the original audio, as good as you're going to get, although you may have playback trouble on some devices if it's in a non-standard rate (i.e. anything other than the cd quality 16/44100 ).
If you really must convert it, and really want to preserve the best sound possible, you should encode it to flac or another lossless format when possible. Then at least you'll be getting a perfect copy of the original. Do be careful to clearly label it as a re-encoded lossy file if you do though, as most people assume "flac" = "cd quality".
BTW, post #12 shows the user having trouble because the codec was aac instead of mp3. That can generally be handled by ensuring that you have faad/libfaad2 installed, and a version of ffmpeg/mplayer/whatever compiled with support for that library. Or just rip it straight again; most players these days have support aac playback too.