title: WARNING: erroneous pipeline: no element "vaapidecode"
body: <p>when I run this line </p>
  
  <pre><code>gst-launch filesrc location=source.mp4 ! decodebin2 ! ffmpegcolorspace ! video/x-raw-rgb ! vaapidecode  ! avimux ! filesink location=result-rgb.avi
  </code></pre>
  
  <p>I got this error </p>
  
  <blockquote>
    <p>WARNING: erroneous pipeline: no element "vaapidecode"</p>
  </blockquote>