Error in Capturing Frames in JavaCV - javacv

Question

All:
I am running Windows XP (32 Bit) with 32 Bit Java and 32 Bit OpenCV 2.4.3. When I attempt to capture a video frame from an AVI with following code in Eclipse:
import com.googlecode.javacv.FrameGrabber.Exception;
import com.googlecode.javacv.OpenCVFrameGrabber;
public class FrameReader
{
public static void main(String[] args) throws Exception,
InterruptedException
{
OpenCVFrameGrabber grabber = new OpenCVFrameGrabber("hall_gray.avi");
grabber.start();
grabber .release();
return;
}//End method
}//End class
The following error happens:
========================== Start of Error =========================
A fatal error has been detected by the Java Runtime Environment:
EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x77c46fa3, pid=4776, tid=3392
JRE version: 7.0_02-b13
Java VM: Java HotSpot(TM) Client VM (22.0-b10 mixed mode, sharing windows-x86 )
Problematic frame:
C [msvcrt.dll+0x36fa3]
Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
An error report file with more information is saved as:
C:\Java Projects\JavaCVTester\hs_err_pid4776.log
If you would like to submit a bug report, please visit:
http://bugreport.sun.com/bugreport/crash.jsp
The crash happened outside the Java Virtual Machine in native code.
See problematic frame for where to report the bug.
==================== End of Error Message ==================
Could someone help me out on this issue?
Thanks in advance.

Answer 1

Try to reinstall your jre.
Also goto the windows startup & recovery option. Choose "writing debugging option" to "Complete memory dump".

Answer 2

The OpenCVFrameGrabber does not support many video formats. The error message "[...] Problematic frame: C [msvcrt.dll+0x36fa3] [...]" probably points out, that your video format may not be supported.
The FFmpegFrameGrabber is more flexible. Try the following code:
import com.googlecode.javacv.FFmpegFrameGrabber;
import com.googlecode.javacv.FrameGrabber;
import com.googlecode.javacv.FrameGrabber.Exception;
public class FrameReader {
public static void main(String[] args) throws Exception {
FrameGrabber grabber = new FFmpegFrameGrabber("hall_gray.avi");
grabber.start();
grabber.release();
return;
}
}

Answer 3

In JavaCV, you can use FFmpegFrameGrabber which is a wrapper of OpenCVFrameGrabber and it has a lot of methods rather than OpenCVFrameGrabber.
Try the following code to extract and save the frames from the video:
import java.io.File;
import com.googlecode.javacv.FFmpegFrameGrabber;
import com.googlecode.javacv.Frame;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvSaveImage;
public class Getting_Frames
{
public static void main(String[] args) throws Exception
{
File f = new File("example.avi");
FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(f);
try {
grabber.start();
} catch (com.googlecode.javacv.FrameGrabber.Exception e1) {
}
long frameLength = grabber.getLengthInFrames();
int increment = (int) Math.ceil(frameLength / 30);
if (frameLength < 30) {
System.err.println("Not enough frames");
}
// To grab frames per 30 seconds
Frame[] s_frame = new Frame[1000];
for (int i=0, frame_counter = 0; i < frameLength; frame_counter++) {
if((frame_counter % 2000 )==0)
{
s_frame[i]=grabber.grabKeyFrame();
IplImage temp = s_frame[i].image;
System.out.println(temp.nChannels()+" "+temp.origin()+" "+temp.highValue());
cvSaveImage(i+"new.jpg",temp);
i++;
}
}
// To know number for each video
System.out.println(frameLength);
}
}