Current version of bash script

#!/bin/bash
#
# DESCRIPTION:
# Very simple script to read the contents of the working
# directory and encode all .avi files to .m4v for adding to
# iTunes, copies to iTunes watched folder, then then deletes
# the input file and the original output file.
#
# USES:
# * HandBrakeCLI to encode the files
# * Rsync to copy encoded files to their final destination
#   so that progress can be tracked.
#
# TODO:
# * Find a way to make HandBrakeCLI run silently
#

output_destination="PATH/TO/SHARE"

for input in *.avi; do
    output=$(echo $input|sed "s/.avi/.m4v/g")
    HandBrakeCLI -i "$input" -o "$output" --preset="AppleTV 2"
    if $? = 0
    then
        rsync -az --progress "$output" "$output_destination"
        rm "$input"
        rm "$output"
        echo "[$(date +"%D %H:%M:%S")]
    Source File: $input
    Output file: $output
    Encode successful
" >> ~/Dropbox/Logs/logfile.txt
    else
        echo "[$(date +"%D %H:%M:%S")]
    Source File: $input
    Output file: $output
    Encode failed
" >> ~/Dropbox/Logs/logfile.txt
    fi
done