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Article:
  The Return of the Blue Q
Subject:   Having trouble with frame grabbing (code from another article)
Date:   2004-07-21 09:02:10
From:   johnmangum

I was trying out the code grabbing a frame from a movie in your article here.


http://www.onjava.com/pub/a/onjava/2002/12/23/jmf.html?page=2


But I'm having trouble getting a good jpeg file from a movie. Here's the code:



QTSession.open();
QTFile qtFile = new QTFile("/Users/josh/kelley20.mp4");


OpenMovieFile movieFile = OpenMovieFile.asRead(qtFile);
Movie movie = Movie.fromFile(movieFile);
int j = 0;
int step = (movie.getDuration() - movie.getTime())/5;
for (int i = movie.getTime(); i < movie.getDuration(); i += step) {
j++;
Pict pict = movie.getPict(i); // frame number
File f = new File("/Users/josh/quicktime/test" + j +".jpeg");

pict.writeToFile(f);
}
QTSession.close();
System.exit(0);


It almost works. There is a file saved and I can open it in safari and it's the right picture. Unfortunately it won't open in camino ("this jpeg contains errors") or preview. It's not really a jpeg though. Graphics Converter says its file format is "QuickTime Importer (QuickDraw)".


Any idea how i can convert this into a jpeg? I've tried using GraphicsImporter,on the file like this:



GraphicsImporter gi = new GraphicsImporter(qtFile); // get a cantFindHandler error here
GraphicsImporterDrawer myDrawer = new GraphicsImporterDrawer
(gi);
QTImageProducer qtProducer = new QTImageProducer (myDrawer,
size);
Image image = Toolkit.getDefaultToolkit().createImage(qtProducer);


but I get the "Unsupported on Mac OS X and Java 1.4 and higher" error on the GraphicsImporterDrawer line. I'm using 10.2, could that be a problem? (I think i've updated quicktime java properly).


Could i use ibm's toolkit for this?


Thanks for your help and great articles, J.


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  1. Chris Adamson photo Having trouble with frame grabbing (code from another article)
    2004-07-22 10:27:30  Chris Adamson | O'Reilly AuthorO'Reilly Blogger [View]

    • Having trouble with frame grabbing (code from another article)
      2004-09-13 19:16:07  ktown [View]

      • Chris Adamson photo Having trouble with frame grabbing (code from another article)
        2004-09-25 11:03:30  Chris Adamson | O'Reilly AuthorO'Reilly Blogger [View]

        • Having trouble with frame grabbing (code from another article)
          2005-01-23 13:27:32  johnmangum [View]

        • Having trouble with frame grabbing (code from another article)
          2005-01-23 13:26:16  johnmangum [View]

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