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There are 7 alternatives - vote for the best!
Gives stereo, 16bit, 44.1kHz (default in Ubuntu/Medibuntu ffmpeg).
-aq 2 = 220-250kbit/s VBR, lower number is better quality. 2 or 3 should be good for most people. If you want the best mp3 q you should remove -aq and use -ab 320k to get 320kbit/s, but that is probably overkill for most .flv videos.
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what will be the setting for mp3? it seems abit missing parameters... what kbps? ar? etc...
While posting I included an example in the summary box, but didn't get reflected, It will be the default values(for -ar, -ab, -ac etc) configured in ffmpeg, I can remember 64 kb/s is ffmpeg's default audio bitrate.