format_conversion.sh

#!/usr/bin/env bash

# Resize image, keep aspect ratio and fill blank space
function jpg_to_png() {
	local input="$1"
	local output="$2"
	convert "$input" -resize 200x200 -background white -gravity center -extent 200x200 $output
}

# Note: 'magick mogrify' replace 'mogrify' in newer versions 
# of ImageMagick
alias heic_to_jpg='magick mogrify -monitor -format jpg'

# Converts SVG to PNG
# Usage svg_to_png input_image_path [output_image_height]
function svg_to_png() {
	local -r filename=$(filename_without_extension "$1")
	local output_filename=$filename.png
	local output_image_height=${2:-32}
	rsvg-convert -h "$output_image_height" "$1" >"$output_filename" && echo "Successfully created $output_filename" || echo "Error converting $1 to $output_filename"
}

function webp_to_png() {
	local -r filename=$(filename_without_extension "$1")
	local output_filename=$filename.png
	local output_image_height=${2:-32}
	dwebp "$1" -o "$output_filename"
}

function pdf_to_jpg() {
	pdfimages -j "$1" page
}

function mov_to_mp4() {
	local input_filename="$1"
	local -r filename=$(filename_without_extension "$1")
	local output_filename=$filename.mp4
	local fps=60

	ffmpeg -i "$input_filename" -loglevel error \
		-fflags +genpts -r $fps "$output_filename" &&
		echo "Successfully created $output_filename" ||
		echo "Error converting $1 to $output_filename"
}