title: gstreamer:No such element or plugin 'videotestsrc'
body: <p>I have upgrade my gstreamer to the lastest version 1.4.0 on Linux, including the gst-plugins-base/good/bad/ugly. But when I try to play a video, I cannot find many elements, such as xvimagesink, videotestsrc and autovideosink.
  I want to know how can I add these elements?</p>
  
  <pre><code>gst-launch --gst-debug-level=3 !filesrc location=FlickAnimation.avi !avidemux name=demux demux.video_00 ! queue ! ffdec_mpeg4   !ffmpegcolorspace !autovideosink
  </code></pre>