How to merge audio in a video using ffmpeg?

In our application we need to merge audio file(mp3) and a video file (flv). We have tried with
[ffmpeg -i input.flv -i input.mp3 -vcodec copy -acodec copy output.flv] but we cant merge the files. so can someone give some suggestion over this.
Tathagat_ChakravartyAsked:
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edster9999Connect With a Mentor Commented:
I would think something like :

mencoder input.flv -o output.flv -ovc copy -oac mp3lame -audiofile input.mp3

(you get mencoder with mplayer sources)
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edster9999Commented:
Well as there is only one answer (mine) I guess that gets all the points
:)

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