draw_relevant_frame_from

# File activestorage/lib/active_storage/previewer/video_previewer.rb, line 18
      def draw_relevant_frame_from(file, &block)
        draw ffmpeg_path, "-i", file.path, "-y", "-vcodec", "png",
          "-vf", "thumbnail", "-vframes", "1", "-f", "image2", "-", &block
      end