title: Drawing on video with ffmpeg
body: <p>I'm trying to get some blocks of colour overlayed/burnt into video with ffmpeg. A bit like a watermark, I suppose but not a logo, just a block of color.</p>
  
  <p>I've looked at using the drawbox function, which appears to me as if it's only applicable to creating images, not video. Alternatively, I could layer an image on the video.</p>
  
  <p>Has anyone got experience with this sorta thing?</p>