Ruby Oneliners to convert images to webp and generate thumbnails

convert_to_webp.rb

require 'fileutils'

# Loop through all .jpg and .png files in the current directory
Dir.glob("{*.jpg,*.png}").each do |img|
  # Construct the output filename with .webp extension
  output_filename = "#{File.basename(img, File.extname(img))}.webp"

  # Execute ffmpeg command to convert the image
  system("ffmpeg -i '#{img}' '#{output_filename}'")
end

convert_to_webp.sh

ruby -e "Dir.glob('{*.jpg,*.png}').each { |img| system('ffmpeg -i \'' + img + '\' -q:v 80 \'' + File.basename(img, File.extname(img)) + '.webp\'') }"

generate_thumbnails.rb

require 'fileutils'

# Loop through all .jpg and .png files in the current directory
Dir.glob("{*.jpg,*.png,*.webp}").each do |img|
  # Use ffprobe to get the original image width
  original_width = %x(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=noprint_wrappers=1:nokey=1 "#{img}").to_i

  # Calculate new widths for medium and small sizes
  medium_width = original_width / 2
  small_width = original_width / 3

  # Base filename without extension
  basename = File.basename(img, File.extname(img))

  # Convert and resize to medium
  system("ffmpeg -i '#{img}' -vf scale=#{medium_width}:-1 '#{basename}.medium.webp'")

  # Convert and resize to small
  system("ffmpeg -i '#{img}' -vf scale=#{small_width}:-1 '#{basename}.small.webp'")
end

generate_thumbnails.sh

ruby -e 'Dir.glob("{*.jpg,*.png,*.webp}").each do |img| width = %x(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=noprint_wrappers=1:nokey=1 "#{img}").to_i; medium_width = width / 2; small_width = width / 3; basename = File.basename(img, File.extname(img)); system("ffmpeg -i \"#{img}\" -vf scale=#{medium_width}:-1 \"#{basename}.medium.webp\""); system("ffmpeg -i \"#{img}\" -vf scale=#{small_width}:-1 \"#{basename}.small.webp\""); end'