Want to change frame rate, help, please !!

Question

hi all,
i want to know whether, jmf does provide any support for changing the frame rate ? is there any ways by which one can change the framerate, of a live captured video ?
i came across one class "FrameRateControl" in jmf, tried it, but wasn't successful in changing the frame rate. plz help me guys.
if u have came across, when doing live capturing using jmstudio, we can change the frame rate. can we do that in our programs tooo.
please someone, wew64, watergad.......... help me out..........,
thanks for ur help.
niraj.

Answer 1

the code is here and it is working on windows, but the framerate could not be changed on linux. it keeps saying rcFormat is null on linux. Then I try to change the framerate with JMStudio, it doest not make any difference as well, it seems keep playing the video with preferred frame rate as well. Any ideas?
import java.applet.Applet;
import java.awt.*;
import java.io.*;
import java.net.*;
import javax.media.*;
import javax.media.cdm.CaptureDeviceManager;
import javax.media.control.*;
import javax.media.format.VideoFormat;
import javax.media.util.BufferToImage;
import javax.media.protocol.*;
import javax.swing.*;
import java.util.*;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class TVCapture extends Applet {
static Player player = null;
Format [] formats;
     FormatControl [] vfc = null; // Video FormatControl
     CaptureDevice vcd = null; // Video CaptureDevice
     private DataSource vds = null; // Video DataSource
     public void init(){
          try {
               vds = Manager.createDataSource(new MediaLocator("v4l://0")); //on linux
//               vds = Manager.createDataSource(new MediaLocator("vfw://0")); //on windows
          } catch (java.io.IOException _e)   {
               System.out.println(_e);
          } catch (NoDataSourceException _e) {
               System.out.println(_e);
          vcd = (CaptureDevice)vds;
          vfc = vcd.getFormatControls();
          if (vfc != null) {
               System.out.println("vfc ! = null");
               System.out.println("vfc[0] = " + vfc[0]);
               System.out.println("vfc.length = " + vfc.length);
               System.out.println("vfc[0].getFormat = " + vfc[0].getFormat());
               Format [] supportedFormats = vfc[0].getSupportedFormats();
               int i;
               for (i=0; i< supportedFormats.length; i ++) {
     System.out.println("supportedFormats["+i+"]=" + supportedFormats);
//               Format tmpFormat = vfc[0].setFormat(supportedFormats[6]);
               Format tmpFormat = supportedFormats[6];
               System.out.println("tmpFormat = " + tmpFormat);
               System.out.println("tmpFormat.getEncoding() = " + tmpFormat.getEncoding());
               System.out.println("Dimension size =" + ((VideoFormat)tmpFormat).getSize());     
               System.out.println("maxDataLength =" + ((VideoFormat)tmpFormat).getMaxDataLength());     
               System.out.println("tmpFormat.getDataType() = " + tmpFormat.getDataType());
               System.out.println("frameRate = " + ((VideoFormat)tmpFormat).getFrameRate());
               VideoFormat videoFormat = new VideoFormat( tmpFormat.getEncoding(),
                                                  ((VideoFormat)tmpFormat).getSize(),
                                                                 ((VideoFormat)tmpFormat).getMaxDataLength(),
                                                                 tmpFormat.getDataType(),
                                                                 25.0f);
               Format rcFormat = vfc[0].setFormat(videoFormat);
               System.out.println("rcFormat = " + rcFormat);
               //it seems rcFormat is null on linux
               //but setFormat is working on windows
          } else {
               System.out.println("cannot get the formatControls()");
          setLayout(new BorderLayout());
          setSize(320,240);
          try {
//      player = Manager.createRealizedPlayer(new MediaLocator("v4l://0"));
player = Manager.createRealizedPlayer(vds);
player.start();
Component comp;
if ((comp = player.getVisualComponent()) != null) {
     add(comp,BorderLayout.NORTH);
//               add (player.getControlPanelComponent());
} catch (Exception e) {
e.printStackTrace();
public static void playerclose() {
          if(player != null) {           
     player.close();
     player.deallocate();
public void close() {
          if(player != null) {
               player.close();
public void destroy() {
          if (player != null) {
          player.close();
          player.deallocate();
public void stop() {
          if (player != null ) {
          player.stop();