generate_instagram_video.bash

#!/bin/bash

cd ~/Desktop

spinner()
{
    local pid=$1
    local delay=0.75
    local spinstr='|/-\'
    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
        local temp=${spinstr#?}
        printf " [%c]  " "$spinstr"
        local spinstr=$temp${spinstr%"$temp"}
        sleep $delay
        printf "\b\b\b\b\b\b"
    done
    printf "    \b\b\b\b"
}

die() { echo "$@" 1>&2 ; exit 1; }

echo "Drag the audio file on the window, followed by [ENTER]:"
read audio

[ -e "$audio" ] || die "Audio file not found at specified location"

echo "Drag the sleeve picture on the window, followed by [ENTER]:"
read sleeve

[ -e "$sleeve" ] || die "Sleeve picture not found at specified location"

echo "Type the time at which the audio should start. i.e: 00:01:00 followed by [ENTER]:"
read from

echo "Type the duration the video should be (in seconds), followed by [ENTER]:"
read duration

at_exit() {
    rm /tmp/"$output".*
}

trap at_exit EXIT

output=$(echo $(basename ${audio%.*}) | tr ' ' _)

minutes=$(echo $from | cut -d : -f 2 | sed 's/^0*[1-9]+//')
seconds=$(echo $from | cut -d : -f 3 | sed 's/^0*[1-9]+//')

skip=$(($minutes * 60 + $seconds))

(
    ffmpeg -loglevel fatal -y -loop 1 \
	-i "$sleeve" \
	-s 1200x1200 \
	-t $duration \
	-c:v libx264 -pix_fmt yuv420p \
	/tmp/"$output".mov

    ffmpeg -loglevel fatal -y -ss $skip -i "$audio" -t $duration /tmp/"$output".mp3

    ffmpeg -loglevel fatal -y \
	-i /tmp/"$output".mov \
	-i /tmp/"$output".mp3 \
	-map 0:v -map 1:a -codec copy \
	-shortest "$output".mov
) &

echo -n "Generating... This may take a while"
spinner $!

echo
echo "Video was successfully generated"