title: Making a green screen background in ffmpeg
body: <p>I'm trying to make a green screen background that I can use to overlay other stuff on top of. I'm using information from <a href="https://stackoverflow.com/a/18141519/3333">this answer</a> and using the following command:</p>
  
  <pre><code>ffmpeg -f lavfi -i color=color=green -s 1920x1080 -t 3600 -r 60 small_green.mp4
  </code></pre>
  
  <p>However, when I open it up in Quicktime, the inspector window seems to be saying that it's actually 1440x1080 instead of 1920x1080. </p>
  
  <p><a href="https://i.stack.imgur.com/afrWe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/afrWe.png" alt="enter image description here"></a></p>
  
  <p>And when I bring it into VLC, it seems to be saying that it's 1920x1090
  <a href="https://i.stack.imgur.com/EcXNS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/EcXNS.png" alt="enter image description here"></a></p>
  
  <p>But <code>ffprobe</code> seems to be saying it's 1920x1080:</p>
  
  <pre><code>Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'small_green.mp4':   Metadata:
      major_brand     : isom
      minor_version   : 512
      compatible_brands: isomiso2avc1mp41
      encoder         : Lavf56.36.100   Duration: 01:00:00.00, start: 0.000000, bitrate: 40 kb/s
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 3:4 DAR 4:3], 34 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
      Metadata:
        handler_name    : VideoHandler
  </code></pre>
  
  <p>And when I bring it into <code>Garmin VIRB Edit</code>, it reports that it's 1440x1080. So how do I make <code>ffmpeg</code> spit out a video that really is HD 1920x1080 resolution?</p>