In case your system can play flv files, but not the avi produced by the script, here are 2 methods to do the conversion. The ffmpeg method produces the exact file size of the original flv input file. The mencoder method produces a flv which is smaller than the original, but the docs for mencoder say it is still somewhat buggy, and requires an odd commandline switch.

Using ffmpeg

#!/bin/sh 

ffmpeg -i $1 -f flv `basename $1 .avi`.flv
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And the mencoder method

#!/bin/sh 

mencoder $1 -of lavf -ovc lavc \
-lavcopts vcodec=flv:vbitrate=150 \
-lavfopts i_certify_that_my_video_stream_does_not_use_b_frames \
-ofps 29.97 -oac mp3lame  -srate 22050 \
-o `basename $1 .avi`.flv
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