title: GStreamer Editing Services freezes when transitions are added
body: <p>I'm trying to use <code>Gstreamer</code>'s <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/index.html" rel="noreferrer">GStreamer Editing Services</a> to <code>concatenate</code> 2 videos, and to have a <code>transition</code> between the two.</p>
  <p>This command, which joins 2 segments of the videos together without a transition, works fine:</p>
  <pre><code>ges-launch-0.10 vshort01.mov 0 5 vshort02.mov 5 5 -r -o file:///tmp/foo.mov
  </code></pre>
  <p>Here is the output from it:</p>
  <pre><code>$ ges-launch-0.10 vshort01.mov 0 5 vshort02.mov 5 5 -r -o file:///tmp/foo.mov
  save_path: (null)
  load_path: (null)
  Adding file:///home/rory/vshort01.mov inpoint:0:00:00.000000000 duration:0:00:05.000000000
  Adding file:///home/rory/vshort02.mov inpoint:0:00:05.000000000 duration:0:00:05.000000000
  Done
  </code></pre>
  <p>If I try to have a short <code>transition</code> between the 2 videos with this command, it just hangs.</p>
  <pre><code>ges-launch-0.10 vshort01.mov 0 5 +transition crossfade 2 vshort02.mov 5 5 -r -o file:///tmp/foo.mov
  </code></pre>
  <p>The output, I get is this:</p>
  <pre><code>save_path: (null)
  load_path: (null)
  Adding file:///home/rory/vshort01.mov inpoint:0:00:00.000000000 duration:0:00:05.000000000
  Adding &lt;transition:crossfade&gt; duration 0:00:02.000000000
  Adding file:///home/rory/vshort02.mov inpoint:0:00:05.000000000 duration:0:00:05.000000000
  </code></pre>
  <p>And there it hangs. The file <code>/tmp/foo.mov</code> stays at 0 bytes, with no CPU activity.</p>
  <blockquote>
  <p>I am using package <code>ges0.10-tools</code> version 0.10.1-1 on ubuntu 11.04 natty. I have tried a freshly built version of gst-editing-services
  from a git clone today <code>c2668d058501513b734c8a8013a5e78c817712bb</code></p>
  </blockquote>
  <p>I tried without the <code>-r -o …</code> options (i.e. telling <code>ges-launch</code> to display the video, not render it to a file), and the same problems occurred. With the <code>+transitition</code>, the window opens (to show the video) showing the first frame of the first video. But the video doesn't play, and there is no CPU usage etc.</p>
  <p>How do I get it to make a file and transition between them?</p>