I want to do frame-differencing on a video-file. I have looked and tried the example installed called FrameDifferencing that uses the Capture to do frame-differencing on the webcam. So I figure I can use this example and set the source to a file instead, right? But I'm new to processing and no expert-programmer so I really could use a little help!

I change "Capture video;" to  "Movie video;"
"video = new Capture(this, width, height);" to "video = new Movie(this, "transit.mov");"
"video.start();" to "video.loop();"

But of course more things need to be changed.. Only getting a gray window

I am getting an error when I try look at the examples with GSVideo. It says "Loading local version of GStreamer not supported in Linux at this time".
Sort of new to this... Is it possible to use GSVideo to process video on Kubuntu?
Thanks