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• how stream the audio track and vidoe track on different channel ? [on hold]

  14 août 2014, par Jega

  i want to stream video file but on different channel. eg , Audio track on port 1000 and video track port 1001 ? please let me known how to split tracks on the video stream to other side ?

• How to make video from images using Java + x264 ; cross platform solution required

  19 octobre 2014, par Shashank Tulsyan

  I have made a software which records my entire day into a video.
  Example video : https://www.youtube.com/watch?v=ITZYMMcubdw (Note : >16hrs compressed in 2mins, video speed too high, might cause epilepsy :P )

  The approach that I use right now is, Avisynth + x264 + Java.
  This is very very efficient. The video for entire day is created in 3-4mins, and reduced to a size of 40-50MB. This is perfect, the only issue is that this solution is not cross platform.
  Does anyone have a better idea ?

  I tried using java based x246 libraries but

  1. They are slow as hell
  2. The video output size is too big
  3. The video quality is not satisfactory.

  Some website suggest a command such as :

  x264.exe --crf 18 --fps 24 --input-res 1920x1080 --input-csp rgb -o "T:\crf18.mkv" "T:\___BBB\big_buck_bunny_%05d.png"

  There are 2 problems with this approach.

  1. As far as I know, x264 does accept image sequence as input, ffmpeg does
  2. The input images are not named in sequence such as image01.png , image02.png etc. They are named as timestamp_as_longinteger.png . So inorder to allow x264 to accept these images as input, I have to rename all of them ( i make a symbolic link for all images in a new folder ). This approach is again unsatisfactory, because I need more flexibility in selecting/unselecting files which would be converted to a video. Right now my approach is a hack.

  The best solution is x264. But not sure how I can send it an image sequence from Java. That too, images which are not named in sequential fashion.

  ---

  BTW The purpose of making video is going back in time, and finding out how time was spend/wasted.
  The software is aware of what the user is doing. So using this I can find out (visually) how a class evolved with time. How much time I spend on a particular class/package/module/project/customer. The granuality right now is upto the class level, I wish to take it to the function level. The software is called jitendriya.

  

  ---

  Here is 1 solution
  How does one encode a series of images into H264 using the x264 C API ?

  But this is for C. If I have to do the same in java, and in a cross plaform fashion, I will have to resort to JNA/JNI. JNA might have a significant performance hit. JNI would be more work.
  FFMpeg also looks like a nice alternative, but I am still not satisfied by any of these solutions looking at the pros and cons.

  ---

  Solution Adapted.

  package weeklyvideomaker;
  
  
  
  import java.awt.AWTException;
  
  import java.awt.Rectangle;
  
  import java.awt.Robot;
  
  import java.awt.Toolkit;
  
  import java.awt.image.BufferedImage;
  
  import java.io.File;
  
  import java.io.IOException;
  
  import java.io.OutputStream;
  
  import java.util.Calendar;
  
  import java.util.LinkedList;
  
  import java.util.logging.Level;
  
  import java.util.logging.Logger;
  
  import neembuu.release1.util.StreamGobbler;
  
  import org.shashaank.activitymonitor.ScreenCaptureHandler;
  
  import org.shashaank.jitendriya.JitendriyaParams;
  
  
  
  /**
  
   *
  
   * @author Shashank
  
   */
  
  public class DirectVideoScreenHandler implements ScreenCaptureHandler {
  
      private final JitendriyaParams  jp;
  
  
  
      private String extension="264";
  
      private boolean lossless=false;
  
      private String fps="24/1";
  
  
  
      private Process p = null;
  
      private Rectangle r1;
  
      private Robot r;
  
  
  
      private int currentDay;
  
  
  
      private static final String[]weeks={"sun","mon","tue","wed","thu","fri","sat"};
  
  
  
      public DirectVideoScreenHandler(JitendriyaParams jp) {
  
          this.jp = jp;
  
      }
  
  
  
      public String getExtension() {
  
          return extension;
  
      }
  
  
  
      public void setExtension(String extension) {
  
          this.extension = extension;
  
      }
  
  
  
      public boolean isLossless() {
  
          return lossless;
  
      }
  
  
  
      public void setLossless(boolean lossless) {
  
          this.lossless = lossless;
  
      }
  
  
  
      public String getFps() {
  
          return fps;
  
      }
  
  
  
      public void setFps(String fps) {
  
          this.fps = fps;
  
      }
  
  
  
      private static int getday(){
  
          return Calendar.getInstance().get(Calendar.DAY_OF_WEEK) - 1;
  
      }
  
  
  
      public void make()throws IOException,AWTException{
  
          currentDay = getday();
  
          File week = jp.getWeekFolder();
  
  
  
          String destinationFile = week+"\\videos\\"+weeks[currentDay]+"_"+System.currentTimeMillis()+"_direct."+extension;
  
  
  
          r = new Robot();
  
          r1 = getScreenSize();
  
  
  
          ProcessBuilder pb = makeProcess(destinationFile, 0, r1.width, r1.height);
  
  
  
          p = pb.start();
  
          StreamGobbler out = new StreamGobbler(p.getInputStream(), "out");
  
          StreamGobbler err = new StreamGobbler(p.getErrorStream(), "err");
  
          out.start();err.start();
  
      }
  
  
  
      private static Rectangle getScreenSize(){
  
          return new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
  
      }
  
  
  
      private void screenShot(OutputStream os)throws IOException{        
  
          BufferedImage bi = r.createScreenCapture(r1);
  
          int[]intRawData = ((java.awt.image.DataBufferInt)
  
                  bi.getRaster().getDataBuffer()).getData();
  
          byte[]rawData = new byte[intRawData.length*3];
  
          for (int i = 0; i < intRawData.length; i++) {
  
              int rgb = intRawData[i];
  
              rawData[ i*3 + 0 ] = (byte) (rgb >> 16);
  
              rawData[ i*3 + 1 ] = (byte) (rgb >> 8);
  
              rawData[ i*3 + 2 ] = (byte) (rgb);
  
          }
  
          os.write(rawData);
  
      }
  
  
  
      private ProcessBuilder makeProcess(String destinationFile, int numberOfFrames,
  
              int width, int height){
  
          LinkedList<string> commands = new LinkedList&lt;>();
  
          commands.add("\""+encoderPath()+"\"");
  
          if(true){
  
              commands.add("-");
  
              if(lossless){
  
                  commands.add("--qp");
  
                  commands.add("0");
  
              }
  
              commands.add("--keyint");
  
              commands.add("240");
  
              commands.add("--sar");
  
              commands.add("1:1");
  
              commands.add("--output");
  
              commands.add("\""+destinationFile+"\"");
  
              if(numberOfFrames>0){
  
                  commands.add("--frames");
  
                  commands.add(String.valueOf(numberOfFrames));
  
              }else{
  
                  commands.add("--stitchable");
  
              }
  
              commands.add("--fps");
  
              commands.add(fps);
  
              commands.add("--input-res");
  
              commands.add(width+"x"+height);
  
              commands.add("--input-csp");
  
              commands.add("rgb");//i420
  
          }
  
          return new ProcessBuilder(commands);
  
      }
  
  
  
      private String encoderPath(){
  
          return jp.getToolsPath()+File.separatorChar+"x264_64.exe";
  
      }
  
  
  
      @Override public void run() {
  
          try {
  
              if(p==null){
  
                  make();
  
              }
  
              if(currentDay!=getday()){// day changed
  
                  destroy(); 
  
                  return;
  
              }
  
              if(!r1.equals(getScreenSize())){// screensize changed
  
                  destroy();
  
                  return;
  
              }
  
              screenShot(p.getOutputStream());
  
          } catch (Exception ex) {
  
              Logger.getLogger(DirectVideoScreenHandler.class.getName()).log(Level.SEVERE, null, ex);
  
          }
  
      }
  
  
  
      private void destroy()throws Exception{
  
          p.getOutputStream().flush();
  
          p.getOutputStream().close();
  
          p.destroy();
  
          p = null;
  
      }
  
  
  
  }
  
  </string>

  ---

  package weeklyvideomaker;
  
  
  
  import org.shashaank.jitendriya.JitendriyaParams;
  
  
  
  /**
  
   *
  
   * @author Shashank
  
   */
  
  public class DirectVideoScreenHandlerTest {
  
      public static void main(String[] args)throws Exception {
  
          JitendriyaParams  jp = new JitendriyaParams.Builder()
  
                  .setToolsPath("F:\\GeneralProjects\\JReminder\\development_environment\\tools")
  
                  .setOsDependentDataFolderPath("J:\\jt_data")
  
                  .build();
  
          DirectVideoScreenHandler w = new DirectVideoScreenHandler(jp);
  
          w.setExtension("264");
  
          w.setFps("24/1");
  
          w.setLossless(false);
  
          w.make();
  
  
  
          for (int i = 0; ; i++) {
  
              w.run();
  
              Thread.sleep(1000);
  
          }
  
      }
  
  }

• Why does FFMPEG adds up extra bit rate to video ? [migrated]

  5 juin 2012, par user735647

  I use FFMPEG (command line Input) to convert my videos to a specific output format. The problem I am facing is when I try to pass a constant bit rate(700 kbps) to FFMPEG, the result is an output video with a different bit rate(say 1000 kbps). This phenomenon occurs invariably for all videos.Why is this happening ? I need to maintain a constant bit rate. Can anyone help me out.

  My FFMPEG version is 0.5

  The command line parameter which I am passing to FFMPEG is,

  -i {inputfile}
  
  -b 700k -ab 64k
  
  -vcodec libx264
  
  -acodec libfaac -ac 2 -ar 44100
  
  -y -s 320x240 
  
  {outputfile}

  EDIT :

  I was able to force CBR with a fluctuation of 3% when I used the following parameters.

   ffmpeg -i myfile.avi
  
   -b 4000k -minrate 4000k 
  
   -maxrate 4000k -bufsize 1835k   out.m2v

  But when I used -maxrate and - minrate along with my parameter set I was not able to force CBR. My parameter set is as follows,

  -i {inputfile}
  
  -b 1200k -minrate 1200k 
  
   -maxrate 1200k -bufsize 1200k 
  
  -ab 64k -vcodec libx264
  
  -acodec libfaac -ac 2 -ar 44100
  
  -y -s 320x240 
  
  {outputfile}

  Why is this happening ?