I did find a working mencoder string. I post it here in case other people might need it:
mencoder inputfile -ofps 20 -vf-add scale=320:240 -vf-add expand=320:240:-1:-1:1 -srate 44100 -ovc xvid -xvidencopts bitrate=400:max_bframes=0:quant_type=h263:me_quali ty=4 -oac lavc -lavcopts acodec=mp2:abitrate=128 -o outputfile.avi
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