How to input video files into IMAQ VIs

I have existing mp2 video files (which I could easily convert to other formats) that I would like to input into IMAQ 6.0 VIs to analyze, one frame at a time. Is there a way to grab frames from a video file (without grabbing hardware) to analyze with IMAQ?

There is an example posted on Developer Zone that will allow you to read back and analyze individual frames from an AVI file (search for IMAQ AVI Read Write Example). If you can convert your MPEG files into AVI files, you should have no problem analyzing the images using IMAQ Vision.
Bear in mind that the MPEG file formats use lossy compression - that is information present within the original images will be lost as part of the MPEG compression process. This may affect the quality of the images that you will be analyzing with IMAQ Vision.
NI has never directly supported the analysis of "movie" files for this reason (the use of compression in the file generation process). The IMAQ Vision software tools are generally targetted towards "machine vision applicati
ons" i.e. where the camera is connected directly to a frame grabber and then processed in software. That being said, I've used this example previously and it should prove a good starting point for your work.

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compile this file first....
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.io.IOException;
import java.io.File;
import java.net.URL;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.TargetDataLine;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.AudioFileFormat;
public class VoicePasswordRecorder extends Thread {
 private TargetDataLine m_line;
 private AudioFileFormat.Type m_targetType;
 private AudioInputStream m_audioInputStream;
 private File m_outputFile;
 public VoicePasswordRecorder(TargetDataLine line,
 AudioFileFormat.Type targetType,
 File file)
 m_line = line;
 m_audioInputStream = new AudioInputStream(line);
 m_targetType = targetType;
 m_outputFile = file;
 /** Starts the recording.
 (i) The line is started,
 (ii) The thread is started,
 public void start()
 /* Starting the TargetDataLine. It tells the line that
 data needs to be read from it. If this method isn't
 called then it won't be able to read data from the line.
 m_line.start();
 /* Starting the thread. This call results in the
 method 'run()'being called. There, the
 data is actually read from the line.
 super.start();
 /** Stops the recording.
 Note that stopping the thread is not necessary. Once
 no more data can be read from the TargetDataLine, no more data
 can be read from the AudioInputStream. The method 'AudioSystem.write()'
 (called in 'run()' returns. Returning from 'AudioSystem.write()'
 is followed by returning from 'run()', and then the thread
 stops automatically.
 public void stopRecording()
 m_line.stop();
 m_line.close();
 /** Main working method.
 'AudioSystem.write()' is called.
 Internally, it works like this: AudioSystem.write()
 contains a loop that is trying to read from the passed
 AudioInputStream. Since there is a special AudioInputStream
 that gets data from a TargetDataLine, reading from the
 AudioInputStream leads to reading from the TargetDataLine. The
 data read this way is then written to the passed File. Before
 writing of audio data starts, a header is written according
 to the desired audio file type. Reading continues until no
 more data can be read from the AudioInputStream. In this case,
 it happens if no more data can be read from the TargetDataLine.
 This happens if the TargetDataLine is stopped. Then,
 the file is closed and 'AudioSystem.write()' returns.
 public void run()
 try
 AudioSystem.write(
 m_audioInputStream,
 m_targetType,
 m_outputFile);
 catch (IOException e)
 e.printStackTrace();
 public static void main(String[] args)
 if (args.length != 1 || args[0].equals("-h"))
 printUsageAndExit();
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 This is taken as the filename of the soundfile
 to store to.
 String strFilename = args[0];
 File outputFile = new File(strFilename);
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 is hardcoded here. The PCM 44.1 kHz, 16 bit signed,
 stereo was used.
 AudioFormat audioFormat = new AudioFormat(
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 44100.0F, 16, 2, 4, 44100.0F, false);
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 TargetDataLine is used later to read audio data from it.
 If requesting the line was successful, it will open it.
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 TargetDataLine targetDataLine = null;
 try
 targetDataLine = (TargetDataLine) AudioSystem.getLine(info);
 targetDataLine.open(audioFormat);
 catch (LineUnavailableException e)
 out("unable to get a recording line");
 e.printStackTrace();
 System.exit(1);
 AudioFileFormat.Type targetType = AudioFileFormat.Type.WAVE;
 /* The creation of the VoicePasswordRecorder object.
 It contains the logic of starting and stopping the
 recording, reading audio data from the TargetDataLine
 and writing the data to a file.
 VoicePasswordRecorder recorder = new VoicePasswordRecorder(
 targetDataLine,
 targetType,
 outputFile);
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 start the recording.
 out("Press ENTER to start the recording.\n");
 try
 System.in.read();
 catch (IOException e)
 e.printStackTrace();
 /* Here, the recording is actually started.
 recorder.start();
 out("Recording...\n");
 /* It is waiting for the user to press ENTER,
 this time to signal that the recording should be stopped.
 out("Press ENTER to stop the recording.\n");
 try
 System.in.read();
 catch (IOException e)
 e.printStackTrace();
 /* Here, the recording is actually stopped.
 recorder.stopRecording();
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 private static void printUsageAndExit()
 out("VoicePasswordRecorder: usage:");
 out("\tjava VoicePasswordRecorder -h");
 out("\tjava VoicePasswordRecorder <audiofile>");
 System.exit(0);
 private static void out(String strMessage)
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import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import javax.sound.sampled.*;
import javax.swing.*;
public class AppletTest extends JApplet
 implements ActionListener
 public AppletTest()
 comp = null;
 startrecording = null;
 stoprecording = null;
 recorder = null;
 public void init()
 Panel panel = new Panel(new FlowLayout(1));
 comp = new JTextArea(50, 50);
 comp.setPreferredSize(new Dimension(50, 50));
 comp.setEditable(false);
 JButton startrecording = new JButton("Start");
 JButton stoprecording = new JButton("Stop");
 comp.append("Please record your Voice Password...\n");
 GridBagLayout gridbag = new GridBagLayout();
 GridBagConstraints c = new GridBagConstraints();
 getContentPane().setLayout(gridbag);
 c.weightx = 1.0D;
 c.weighty = 1.0D;
 gridbag.setConstraints(comp, c);
 gridbag.setConstraints(panel, c);
 getContentPane().add(comp, c);
 getContentPane().add(panel, c);
 c.weightx = 0.0D;
 c.weighty = 0.0D;
 startrecording.setEnabled(true);
 stoprecording.setEnabled(true);
 startrecording.addActionListener(this);
 gridbag.setConstraints(startrecording, c);
 getContentPane().add(startrecording, c);
 stoprecording.addActionListener(this);
 gridbag.setConstraints(stoprecording, c);
 getContentPane().add(stoprecording, c);
 int width = 300;
 int height = 200;
 setSize(width, height);
 setVisible(true);
 boolean looping = false;
 public void actionPerformed(ActionEvent ae)
 if(ae.getActionCommand().equals("Start"))
 createRecorder();
 recorder.start();
 System.out.println("Start Button Clicked");
 } else
 if(ae.getActionCommand().equals("Stop"))
 recorder.stopRecording();
 System.out.println("Stop Button Clicked");
 private void createRecorder()
 String strFilename = "C:\test.wav";
 File outputFile = new File(strFilename);
 AudioFormat audioFormat = new AudioFormat(javax.sound.sampled.AudioFormat.Encoding.PCM_SIGNED, 44100F, 16, 2, 4, 44100F, false);
 javax.sound.sampled.DataLine.Info info = new javax.sound.sampled.DataLine.Info(javax.sound.sampled.TargetDataLine.class, audioFormat);
 TargetDataLine targetDataLine = null;
 try
 targetDataLine = (TargetDataLine)AudioSystem.getLine(info);
 targetDataLine.open(audioFormat);
 catch(LineUnavailableException e)
 comp.append("unable to get a recording line\n");
 e.printStackTrace();
 System.exit(1);
 javax.sound.sampled.AudioFileFormat.Type targetType = javax.sound.sampled.AudioFileFormat.Type.WAVE;
 recorder = new SimpleAudioRecorder(targetDataLine, targetType, outputFile);
 comp.append("Press ENTER to start the recording.\n");
 try
 System.in.read();
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 e.printStackTrace();
 comp.append("Recording...\n");
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 System.in.read();
 catch(IOException e)
 e.printStackTrace();
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}I intend to use this for verifying the username, password and a voice password over the web....as shown in the following code...
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<meta http-equiv="Content-Language" content="en-us">
<title>Home Page</title>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta name="Microsoft Theme" content="artsy 011, default">
<meta name="Microsoft Border" content="tl, default">
</head>
<body background="arttilea.jpg" bgcolor="#000000" text="#FFFFCC" link="#FF9900" vlink="#999900" alink="#669933">

 Please enter login
 details below:
<form>
<table border=0 cellpadding=3 cellspacing=3>
<tr>
 <td align=right width="74">
 Username
 </td>
 <td width="335">
 <input type=text
 name=username size="20">
 </td>
</tr>
<tr>
 <td align=right width="74">
 Password
 </td>
 <td width="335">
 
 <input
 type=password name=password size="20">
 </td>
</tr>
<tr>
 <td align=center width="74">
 Voice
 Password Check
 </td>
 <td width="335">
 
<APPLET CODE="AppletTest.class" ALIGN="MIDDLE" WIDTH=272 HEIGHT=38 NAME="AppletTest.class"></APPLET> 
 </td>
</tr>
<tr>
 <td colspan=2 align=center>
 <input type=submit value="Enter Website" name="Submit">
 </td>
</tr>
</table>
</form>
 This page was last updated on 25/03/04.
</body>
</html>I will be very grateful if somebody could help me out....as this is my first time at java programming ....also my first time for using this forum!
Thanks,
Regards,
Mayur Patel

Hi
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i am posting my code
import java.io.FileReader;
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How to input video files into IMAQ VIs

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