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Bash Loops multiplex A/V

I have a shell script I'm using to convert a large batch of those dreaded .wmv files.
here's my script which works perfect,

for i in *.wmv ; do
j=${i%.wmv}
if [ -f "$i" ]; then
rm -f "$i.wav"
mkfifo "$i.wav"
nice -n 15 mplayer -quiet -vo null -vc dummy "$i" -ao pcm:waveheader:file="$i.wav" &
nice -n 15 lame -V5 -m m --vbr-new --resample 32000 "$i.wav" "$j.mp3"
rm -f "$i.wav"
fi
done

for i in *.wmv ; do
j=${i%.wmv}

nice -n 15 /usr/bin/mencoder -idx -ovc xvid -xvidencopts me_quality=6:fixed_quant=3:vhq=2:bf_threshold=1:max_bframes=1:hq_ac:chroma_me:chroma_opt:max_key_int erval=100:bvhq=1:min_iquant=1:max_iquant=31:min_pquant=1:max_pquant=31:min_bquant=1:max_bquant=31:no qpel:nogmc:trellis:nopacked:closed_gop:nocartoon:quant_type=mpeg -nosound -ofps 29.970 "$i" -o "$j.avi"
done

echo $?

if [ $? == 0 ] ; then kdialog --msgbox "encoding successfull" ; then rm -f *.wmv
elif
[ $? == 1 ] ; then kdialog --error "sorry there were errors" ; exit
fi
The problem is I can't seem to find the proper way to get mencoder to multiplex the .avi with the .mp3. I've tried ten different ways,like if there's 10 .avi & 10 .mp3 how can I have mencoder match up the proper video and audio?? I know on 1 by 1 basis is simple enough

"mencoder -idx -ovc copy -oac copy video.avi -audiofile audio.mp3 -o samename.AVI"
I've read tutorials and googled and such but this one is stumping me.
any help is appreciated

Thank you all so kind!!

Need only one loop, so grouping stuff together should work. Untested example so YMMV(VM):

Code:

#!/bin/sh

# For testing, else comment out:

set -evx

[ $# -ne 0 ] &&  set -n

# Since all children inherit we'll apply nice value to self:

nice -n 15 $$

# Functions make it easier to group stuff you call more often or only under certain conditions

showError() { kdialog --error "Error during "$1", exiting."; exit 1; }

showOKAndRemove() { kdialog --yesno "All OK. Delete "$1"?" 2>/dev/null; case "$?" in 0) rm -f "$1";; *) ;; esac; }

# Group options so you only have to change in one easy accessable place or place in a config file and source it:

MPLAYER_OPTS0='-quiet -vo null -vc dummy'

MPLAYER_OPTS1='-ao pcm:waveheader:file='

LAME_OPTS='-V5 -m m --vbr-new --resample 32000'

MENCODER_OPTS0='-idx -ovc xvid -xvidencopts me_quality=6:fixed_quant=3:vhq=2:bf_threshold=1:max_bframes=1:hq_ac:\

chroma_me:chroma_opt:max_key_int erval=100:bvhq=1:min_iquant=1:max_iquant=31:min_pquant=1:max_pquant=31:\

min_bquant=1:max_bquant=31:no qpel:nogmc:trellis:nopacked:closed_gop:nocartoon:quant_type=mpeg -nosound -ofps 29.970'

MENCODER_OPTS1='-idx -ovc copy -oac copy'



find . type f -iname \*.wmv | while read INPUT; do

        OUTPUT="${INPUT%.wmv}"

        # Outputname with underscores instead of spaces uncomment this:

        #OUTPUT="${OUTPUT// /_}"

        # Since 'find' fins stuff we only need to break on wacky INPUT name

        if [ ! -f "${INPUT}" ]; then

                showError "finding file ${INPUT}"

        fi

        rm -f "${INPUT}.wav" || showError "removing wav file"

        mkfifo "${INPUT}.wav" || showError "mkfifo"

        mplayer $MPLAYER_OPTS "$INPUT" $MPLAYER_OPTS1"${INPUT}.wav" || showError "wav creation"

        lame $LAME_OPTS "${INPUT}.wav" "${OUTPUT}.mp3" || showError "creating mp3"

        rm -f "${INPUT}.wav" || showError "removing wav file"

        mencoder $MENCODER_OPTS0 "${INPUT}" -o "${OUTPUT}.avi" || showError "video encoding"

        mencoder $MENCODER_OPTS1 "${OUTPUT}.avi" -audiofile "${OUTPUT}.mp3" -o "${OUTPUT}.avi" || showError "muxing"

        showOKAndRemove "${INPUT}"

done



exit 0