[all variants] Convert mp3 to avi

[cudjoe]

Thanks Locutus_of_Borg.
With the information of Fakeoutdoorsman, I made this small shell script (ffmpeg instead of mencoder) :

input=$1
output=$2

background=/tmp/bng-black.jpg
convert -size 320x240 xc:black $background
duration=`ffmpeg -i $input 2>&1 | grep Duration | cut -f1 -d, | cut -f2,3,4,5 -d:`
ffmpeg -loop_input -i $background -i $input -vcodec mpeg4 -acodec copy -t $duration $output

Thank you very much for your assistance !