I'm trying to use gstreamer's GStreamer Editing Services to concatinate 2 videos, and to have a transition between the two.

This command, which just joins 2 segments of the videos together without a transition, works fine:

    ges-launch-0.10 vshort01.mov 0 5 vshort02.mov 5 5 -r -o file:///tmp/foo.mov
Here is the output from it:

    $ 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

If I try to have a short transition between the 2 videos with this command, it just hangs.

    ges-launch-0.10 vshort01.mov 0 5 +transition crossfade 2 vshort02.mov 5 5 -r -o file:///tmp/foo.mov

The output, I get is this:

    save_path: (null)
    load_path: (null)
    Adding file:///home/rory/vshort01.mov inpoint:0:00:00.000000000 duration:0:00:05.000000000
    Adding <transition:crossfade> duration 0:00:02.000000000
    Adding file:///home/rory/vshort02.mov inpoint:0:00:05.000000000 duration:0:00:05.000000000

And there it hangs. The file /tmp/foo.mov stays at 0 bytes, and there is no CPU activity.

I am the package ges0.10-tools 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 a while ago, c2668d058501513b734c8a8013a5e78c817712bb

I tried without the ``-r -o …`` options (i.e. telling ges-launch to display the video, not render it to a file), and the same problems occur. With the +transitition, then 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.

This also appear on Stackoverflow http://stackoverflow.com/questions/6779992/transitions-with-gstreamer-editing-services-freezes-but-works-ok-without-transit