image from video file

[anuja Edathu]

when i upload a video file i want to store the thumbnail for the first frame of the video. what steps should i follow inorder to achieve this?
Thanks
Anuja K

[Ulf Dittmer]

You'll need to open the movie with an API that understands the movie file format, and which can extract single images. You didn't say which format that is, but QuickTime can read quite a few. The JMF API from Sun may also help, but it is no longer actively maintained.

[anuja Edathu]

Thank you Ulf Dittmer for your reply , i need to upload video file of any format .Will this be possible with the above API.
I tried using JMF with a sample program from net

  public class FrameAccess  {
 
public static void main(String ar[]){
// create a movie player, in a 'realized' state
try{
URL url = new URL("file:/home/anuja/Desktop/AVSEQ01.DAT");
Player p = Manager.createRealizedPlayer(url);
 
// create a frame positioner
FramePositioningControl fpc = 
   (FramePositioningControl) 
    p.getControl("javax.media.control.FramePositioningControl");
 
// create a frame grabber
FrameGrabbingControl fg = 
    (FrameGrabbingControl) 
    p.getControl("javax.media.control.FrameGrabbingControl");
 
// request that the player changes to a 'prefetched' state
p.prefetch();
 
// wait until the player is in that state...
 
// move to a particular frame, e.g. frame 100
fpc.seek(100);
 
 // take a snap of the current frame
Buffer buf = fg.grabFrame();    
 
// get its video format details
VideoFormat vf = (VideoFormat) buf.getFormat();
 
// initialize BufferToImage with video format
BufferToImage bufferToImage = 
                      new BufferToImage(vf);
 
// convert the buffer to an image
Image im = bufferToImage.createImage(buf);
 
// specify the format of desired BufferedImage
BufferedImage formatImg = 
          new BufferedImage(360, 360,BufferedImage.TYPE_3BYTE_BGR);
 
// convert the image to a BufferedImage
Graphics g = formatImg.getGraphics();
g.drawImage(im, 0, 0,360, 360, null);
g.dispose();
}catch (Exception e) {
System.out.println("exception i " + e );
// TODO: handle exception
}

}
}
  

but when i run this im getting can not realize player Exception

    Unable to handle format: XVID, 720x336, FrameRate=23.9, Length=1451520 0 extra bytes
  Unable to handle format: mpeglayer3, 32000.0 Hz, 0-bit, Stereo, Unsigned, 8000.0 frame rate, FrameSize=8 bits
Failed to realize: com.sun.media.PlaybackEngine@92e78c
Error: Unable to realize com.sun.media.PlaybackEngine@92e78c
exception is-> javax.media.CannotRealizeException  

can any one tell me what i am doing wrong about this and how can i correct it ?

Regards ,
Anuja K

[Ulf Dittmer]

It looks like JMF can't handle the XVID file format. I don't think there's anything you can do about that, and I've no idea if QuickTime supports XVID. The easiest way to find out is probably to try and run the video through the QuickTime Player application.

[anuja Edathu]

that reply was helpul, i found the jmf registry supports mpg and mpv . i changed URL url = new URL("file:/home/anuja/Desktop/lion.mpg");
now im not getting previous error but it seems ,

   Buffer buf = fg.grabFrame();  

returns null thoguh fpc.seek() is not null . Any thoughts on this will be appreciated?
Thanks & Regards ,
Anuja K

[Ulf Dittmer]

Are you sure that the movie is fully loaded? I'm not familiar with JMF, but maybe you need to use a mechanism like MediaTracker to determine when the image/movie is fully loaded.