2mp4

#!/usr/bin/env bash
# ref. https://github.com/mariomaric/EncodeForYouTube/blob/master/encode4yt.sh

size="1280x720"

# Check if second argument is provided
if [ -z "$2" ]
then
    # Create variable with PNG image location
    background="/tmp/background.png"

    # Create background image using filename as white text on black background
    convert \
        -size "$size" \
        -background black -fill white \
        -depth 8 -type Grayscale \
        "$background"
else
    # Use second argument as a background image
    if [ -f "$2" ]
    then
        background="$2"
    else
        echo "$2 not found."
        exit 1
    fi
fi

ffmpeg -i "$1" "${1%.*}".jpg
if [ !-f "${1%.*}".jpg ]; then
    ffmpeg -f image2 -loop 1 -framerate 1 -i "${1%.*}".jpg -i "$1" -acodec copy -shortest -s "$size" "${1%.*}".mp4
else
    ffmpeg -f image2 -loop 1 -framerate 1 -i "$background" -i "$1" -acodec copy -shortest -s "$size" "${1%.*}".mp4
fi