duration: 2.0
width: 400
height: 400
command: rsvg-convert -w {width} -h {height} <{infile} >{outfile}
template: |-
  <?xml version="1.0" standalone="no"?>
  <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
  <svg width="400" height="400" viewBox="0 0 400 400" version="1.1">
    <rect width="100%" height="100%" fill="white" />
    <rect x="25%" y="25%" width="50%" height="50%" fill="black" transform="rotate({{ t * 90.0 }}      200 200)" />
    <rect x="37.5%" y="37.5%" width="25%" height="25%" fill="white" transform="rotate({{ t * -90.0 }} 200 200)" />
  </svg>