Extraction Key Frames from a video

Hi all,
I would like to know what is the best way to extract keyframe from a video.
My Status (butr I can cahnge it)
I'm Marco and I'm using JMF; I need for an help because I don't know how to extract keyframes from AVI and MPG files.
I'm using the code posted in this forum for extracting all frame in a video with the adding of an if expression that in the accessFrame method that I report below:
void accessFrame(Buffer frame) {
BufferToImage stopBuffer = new BufferToImage((VideoFormat) frame.getFormat());
Image stopImage = stopBuffer.createImage(frame);
try {
BufferedImage outImage = new BufferedImage(size.width, size.height, BufferedImage.TYPE_INT_RGB);
Graphics og = outImage.getGraphics();
og.drawImage(stopImage, 0, 0, size.width, size.height, null);
Iterator writers = ImageIO.getImageWritersByFormatName("jpg");
ImageWriter writer = (ImageWriter) writers.next();
File f = new File(frame.getSequenceNumber() + ".jpg");
if ((frame.getFlags() & Buffer.FLAG_KEY_FRAME) != 0){{color}
{color:#ff9900}
ImageOutputStream ios = ImageIO.createImageOutputStream(f);
writer.setOutput(ios);
{color:#ff9900}
writer.write(outImage);
ios.close();}
} catch (IOException e) {{color}
System.out.println("Error :" + e);
So, I'm able to extract some keyframe, but i'm not sure it is the correct way and my dubt grows out of the fact that without the if expression highlighted in red, it seems that I have more keyframes (those ones with flag ==1040). Another problem is that it works only with AVI because MPG instead of 1040, they have alternate sequence of 32 and 1056.
Cheers and thank u
Marco

>
With the code yoodleyee posted, frames can be extracted and converted from the raw decoded format into images, but no guarantee that the frame extracted is a key frame, isnt it?Actually, there is such a guarantee...because the FrameGrabbingControl isn't implemented in any video format that uses keyframes. So, if it works, then every frame of the video is a keyframe, and it won't work otherwise.
How can key frames be detected with JMF and then extracted with the code provided? Any tutorial or sample code about that?They can't be. You can write a custom codec that will give you access to every frame, regardless of the format, if you're wanting to get all of the frames.
Example: [http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/FrameAccess.html]
But JMF doesn't have any way of dealing with key frames directly, at least that I am aware of.

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