Installed processing 2.0 b8 on Windows 7 64 today and now the Processing Movie Maker dialog works AND also offers an option to include a soundtrack in the movie! Hooray! But, when I try to write the movie I only get  an error message of "Creating the quicktime movie failed. Closed".

Here's the frame saving line:

  saveFrame("output/frames####.tif"); 

The console message:

java.io.IOException: closed
    at javax.imageio.stream.ImageInputStreamImpl.checkClosed(ImageInputStreamImpl.java:96)
    at javax.imageio.stream.ImageInputStreamImpl.close(ImageInputStreamImpl.java:843)
    at javax.imageio.stream.FileImageOutputStream.close(FileImageOutputStream.java:143)
    at ch.randelshofer.media.quicktime.QuickTimeWriter.close(QuickTimeWriter.java:3046)
    at processing.app.tools.MovieMaker.writeVideoOnlyVFR(MovieMaker.java:679)
    at processing.app.tools.MovieMaker.access$10(MovieMaker.java:609)
    at processing.app.tools.MovieMaker$4.doInBackground(MovieMaker.java:572)
    at javax.swing.SwingWorker$1.call(SwingWorker.java:277)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at javax.swing.SwingWorker.run(SwingWorker.java:316)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)