Merge video and audio

merge_av.sh

#!/bin/bash

VIDEO=$1
AUDIO=$2
OUTPUT=$3

help(){
    echo "Usage: burn_ass.sh <video> <ass sub> <output>"
}

burn(){
    ffmpeg -i ${VIDEO} -i ${AUDIO} -c:v copy ${OUTPUT}
}

install(){
    sudo apt-get install ffmpeg
}

dpkg -l | grep 'ffmpeg' > /dev/null
FFMPEG=$?
if [ "$1" = "-h" -o "$1" = "--help" -o -z "$1" ]; then
    help
elif [ ${FFMPEG} ]; then
    burn
else
    echo "ffmpeg not found, installing..."
    install
    burn
fi