Mine

        for t in "${cmd[@]}"; do
            echo "Running nice transcode --print_status 340 -q 1 -i "${IN_FILES[i]}" \
            ${NAVSEEK[i]} -o $WORK_DIR/submenu/ \
            -f $FRAME_RATE -Z ${GEO_ARRAY[C]},fast -c $t -y $SM_IMG_FMT,null" |
            sed 's/    */ /g'|sed -e "s/^ *//"|tee -a "$LOG_FILE"

            TCODE_CMD=(nice transcode --print_status 340 --write_pid /tmp/tcode.pid \
            -q 1 -i "${IN_FILES[i]}"   ${NAVSEEK[i]} -o "${PICS_OUT[@]}" \
            -f $FRAME_RATE -Z ${GEO_ARRAY[C]},fast -c $t -y $SM_IMG_FMT,null)
            function run_transcode()
            {
                "${TCODE_CMD[@]}" >> "$LOG_FILE"  2>&1
                sleep 1
            }
            run_transcode &
            sleep .5 # short sleep to allow 1st jpg to appear
            TCODE_PID=$(</tmp/tcode.pid)
            check_stall &
            (
            if [ -n "$TCODE_PID" ]; then
                while ps -p $TCODE_PID >/dev/null; do
                    sleep $SLEEP # spinner interval
                spin "Seeking in video and creating images: $(find "$JPEG_DIR" \
            -maxdepth 1 -name \*.jpg|sort|awk -F / '{ field = $NF }; END{ print field }')"
                done
                echo
                echo "Created $(find "$JPEG_DIR" -maxdepth 1 -name \*.jpg|wc -l) JPEGS of $TOTAL_JPEGS"
                #cleanlog 1
            else
                #cleanlog 1
                runtime_error "Problem creating images from the video."
               $FROM_GUI && exit_from_gui || exit 1
            fi
            )
            unset TCODE_CMD cmd run_transcode
           if ! $ANI_SUB_MENU ; then
                echo
                mv $WORK_DIR/submenu/000000.$SM_IMG_FMT \
                $WORK_DIR/submenu/$(printf "%08d%s\n" ${t%-*} .$SM_IMG_FMT)
            elif $ANI_SUB_MENU; then
                echo "renaming images by frame number"
                echo
                u=${t/*-}; v=${t/-*}
                for ((n=0; n<340; n++)); do
                    if [ $v -eq 30 ]; then
                        mv  $WORK_DIR/animenu/$(printf "%06d%s\n" $n .jpg) \
                        $WORK_DIR/animenu/$(printf "%08d%s\n" $((n+30)) .jpg)
                    else
                        mv  $WORK_DIR/animenu/$(printf "%06d%s\n" $n .jpg) \
                        $WORK_DIR/animenu/$(printf "%08d%s\n" $((n+v)) .jpg)
                    fi
                done
            fi
        done
            if $ANI_SUB_MENU ; then
                # move 340 images to each subdir:  $WORK_DIR/animenu/{0,1,2,3,etc}
                echo "moving images into subdirectories"
                for ((a=0; a<${CHAPTERS[i]}; a++)); do
                    pics=( $(find $WORK_DIR/animenu/ -maxdepth 1 -name 00\*.$SM_IMG_FMT |
                    sort|head -n 340) )
                    echo "${pics[@]}" >> "$WORK_DIR/pics.log"
                    for f in ${pics[@]}; do
                        mv $f $WORK_DIR/animenu/$a
                    done
                done
 
                for ((a=0; a<${CHAPTERS[i]}; a++)); do
                    find $WORK_DIR/animenu/$a/ -name 00\*.$SM_IMG_FMT |
                    sort| head -n 20|xargs rm -f
                    find $WORK_DIR/animenu/$a/ -name 00\*.$SM_IMG_FMT |
                    sort|tail -n 20|xargs rm -f
                done
                # clean up left over pics in animenu/ dir
#                rm -f $WORK_DIR/animenu/*.$SM_IMG_FMT
            fi

        if $ANI_SUB_MENU; then
            echo
            echo "Making 300 montage images for "${IN_FILES[i]}""

            for ((a=1; a<300; a++)); do
                spin "\rProcessing "$a.$SM_IMG_FMT"  "
                for ((b=0; b<${CHAPTERS[i]}; b++)); do
                    IMGS=( "${IMGS[@]}" $(find $WORK_DIR/animenu/$b \
                    -name \*.$SM_IMG_FMT| sort|head -n $a | sed -n -e "$a p") )
                done
                IM_CMD=(montage ${IMGS[@]} -tile ${TILE_ARRAY[C]} \
                -geometry ${GEO_ARRAY[C]}+5+5 -bordercolor '#161514' \
                -mattecolor '#161514' -background '#161514' miff:-)
                IM_CMD2=(convert $WORK_DIR/submenu_template.jpg \
                $WORK_DIR/title${i}_txt.png  -gravity south \
                -geometry +0+55 -composite -  -gravity north -geometry +0+45 \
                -composite $WORK_DIR/animenu/$a.$SM_IMG_FMT)
                "${IM_CMD[@]}" | "${IM_CMD2[@]}"
                unset IMGS
            done

            unset IM_CMD IM_CMD2 d f PIC
        else # not $ANI_SUB_MENU

. . . . . . . . .