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Sur d’autres sites (8436)
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I am using ffmpeg java library to convert captured screenshots to video. Video output is blurry
2 octobre 2020, par dark princeI am using ffmpeg java library to convert captured screenshots to video. Video which is generated as output is blurry.


I am using bit rate as 9000, frames per sec as 25 and video size as that of desktop screen size.


Any suggestions on how to solve this issue.


P.S. I cannot use ffmpeg.exe and command line due to certain restrictions and hence I am opting for ffmpeg java library.


Any suggestions on the issue or suggestions on any better approach will be helpful.


import java.awt.AWTException;
 import java.awt.Dimension;
 import java.awt.FlowLayout;
 import java.awt.Rectangle;
 import java.awt.Robot;
 import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.util.Date;
 
 import javax.imageio.ImageIO;
 import javax.swing.JButton;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JOptionPane;
 
 import org.bytedeco.javacpp.avcodec;
 import org.bytedeco.javacv.FFmpegFrameRecorder;
 import org.bytedeco.javacv.OpenCVFrameConverter;
 
 public class ScreenRecorder{
 
 public static boolean videoComplete=false;
 public static String inputImageDir="inputImgFolder"+File.separator;
 public static String inputImgExt="png";
 public static String outputVideo="recording.mp4"; 
 public static int counter=0;
 public static int imgProcessed=0;
 public static FFmpegFrameRecorder recorder=null;
 public static int videoWidth=1920;
 public static int videoHeight=1080;
 public static int videoFrameRate=3;
 public static int videoQuality=0; // 0 is the max quality
 public static int videoBitRate=9000;
 public static String videoFormat="mp4";
 public static int videoCodec=avcodec.AV_CODEC_ID_MPEG4;
 public static Thread t1=null;
 public static Thread t2=null;
 public static JFrame frame=null;
 public static boolean isRegionSelected=false;
 public static int c1=0;
 public static int c2=0;
 public static int c3=0;
 public static int c4=0;
 
 
 public static void main(String[] args) {
 
 try {
 if(getRecorder()==null)
 {
 System.out.println("Cannot make recorder object, Exiting program");
 System.exit(0);
 }
 if(getRobot()==null)
 {
 System.out.println("Cannot make robot object, Exiting program");
 System.exit(0);
 }
 File scanFolder=new File(inputImageDir);
 scanFolder.delete();
 scanFolder.mkdirs();
 
 createGUI();
 } catch (Exception e) {
 System.out.println("Exception in program "+e.getMessage());
 }
 }
 
 public static void createGUI()
 {
 frame=new JFrame("Screen Recorder");
 JButton b1=new JButton("Select Region for Recording");
 JButton b2=new JButton("Start Recording");
 JButton b3=new JButton("Stop Recording");
 JLabel l1=new JLabel("<br />If you dont select a region then full screen recording <br /> will be made when you click on Start Recording");
 l1.setFont (l1.getFont ().deriveFont (20.0f));
 b1.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 try {
 JOptionPane.showMessageDialog(frame, "A new window will open. Use your mouse to select the region you like to record");
 new CropRegion().getImage();
 } catch (Exception e1) {
 // TODO Auto-generated catch block
 System.out.println("Issue while trying to call the module to crop region");
 e1.printStackTrace();
 } 
 }
 });
 b2.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 counter=0;
 startRecording();
 }
 });
 b3.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 stopRecording();
 System.out.print("Exiting...");
 System.exit(0);
 }
 });
 
 frame.add(b1);
 frame.add(b2);
 frame.add(b3);
 frame.add(l1);
 frame.setLayout(new FlowLayout(0));
 frame.setVisible(true);
 frame.setSize(1000, 170);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }
 
 public static void startRecording()
 {
 t1=new Thread()
 {
 public void run() {
 try {
 takeScreenshot(getRobot());
 } catch (Exception e) {
 JOptionPane.showMessageDialog(frame, "Cannot make robot object, Exiting program "+e.getMessage());
 System.out.println("Cannot make robot object, Exiting program "+e.getMessage());
 System.exit(0);
 }
 }
 };
 
 t2=new Thread()
 {
 public void run() {
 prepareVideo();
 }
 };
 
 t1.start();
 t2.start();
 System.out.println("Started recording at "+new Date());
 }
 
 public static Robot getRobot() throws Exception
 {
 Robot r=null;
 try {
 r = new Robot();
 return r;
 } catch (AWTException e) {
 JOptionPane.showMessageDialog(frame, "Issue while initiating Robot object "+e.getMessage());
 System.out.println("Issue while initiating Robot object "+e.getMessage());
 throw new Exception("Issue while initiating Robot object");
 }
 }
 
 public static void takeScreenshot(Robot r)
 {
 Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
 Rectangle rec=new Rectangle(size);
 if(isRegionSelected)
 {
 rec=new Rectangle(c1, c2, c3-c1, c4-c2);
 }
 while(!videoComplete)
 {
 counter++;
 BufferedImage img = r.createScreenCapture(rec);
 try {
 ImageIO.write(img, inputImgExt, new File(inputImageDir+counter+"."+inputImgExt));
 } catch (IOException e) {
 JOptionPane.showMessageDialog(frame, "Got an issue while writing the screenshot to disk "+e.getMessage());
 System.out.println("Got an issue while writing the screenshot to disk "+e.getMessage());
 counter--;
 }
 }
 }
 
 public static void prepareVideo()
 {
 File scanFolder=new File(inputImageDir);
 while(!videoComplete)
 {
 File[] inputFiles=scanFolder.listFiles();
 try {
 getRobot().delay(500);
 } catch (Exception e) {
 }
 //for(int i=0;i/imgProcessed++;
 addImageToVideo(inputFiles[i].getAbsolutePath());
 //String imgToAdd=scanFolder.getAbsolutePath()+File.separator+imgProcessed+"."+inputImgExt;
 //addImageToVideo(imgToAdd);
 //new File(imgToAdd).delete();
 inputFiles[i].delete();
 }
 }
 
 File[] inputFiles=scanFolder.listFiles();
 for(int i=0;i/ maximum quality
 recorder.start();
 }
 catch(Exception e)
 {
 JOptionPane.showMessageDialog(frame, "Exception while starting the recorder object "+e.getMessage());
 System.out.println("Exception while starting the recorder object "+e.getMessage());
 throw new Exception("Unable to start recorder");
 }
 return recorder;
 }
 
 public static OpenCVFrameConverter.ToIplImage getFrameConverter()
 {
 OpenCVFrameConverter.ToIplImage grabberConverter = new OpenCVFrameConverter.ToIplImage();
 return grabberConverter;
 }
 
 public static void addImageToVideo(String imgPath)
 {
 try {
 getRecorder().record(getFrameConverter().convert(cvLoadImage(imgPath)));
 } catch (Exception e) {
 JOptionPane.showMessageDialog(frame, "Exception while adding image to video "+e.getMessage());
 System.out.println("Exception while adding image to video "+e.getMessage());
 }
 }
 
 public static void stopRecording()
 {
 try {
 videoComplete=true;
 System.out.println("Stopping recording at "+new Date());
 t1.join();
 System.out.println("Screenshot thread complete");
 t2.join();
 System.out.println("Video maker thread complete");
 getRecorder().stop();
 System.out.println("Recording has been saved successfully at "+new File(outputVideo).getAbsolutePath());
 JOptionPane.showMessageDialog(frame, "Recording has been saved successfully at "+new File(outputVideo).getAbsolutePath());
 } catch (Exception e) {
 System.out.println("Exception while stopping the recorder "+e.getMessage());
 }
 }
 }


Imagepanel.java


import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JPanel;

class ImagePanel
 extends JPanel
{
 private Image img;
 
 public ImagePanel(String img)
 {
 this(new ImageIcon(img).getImage());
 }
 
 public ImagePanel(Image img)
 {
 this.img = img;
 Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
 
 setPreferredSize(size);
 setMinimumSize(size);
 setMaximumSize(size);
 setSize(size);
 setLayout(null);
 }
 
 public void paintComponent(Graphics g)
 {
 g.drawImage(this.img, 0, 0, null);
 }
}


CropRegion.java


import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;


public class CropRegion implements MouseListener,
 MouseMotionListener {

 int drag_status = 0;
 int c1;
 int c2;
 int c3;
 int c4;
 JFrame frame=null;
 static int counter=0;
 JLabel background=null;

 
 public void getImage() throws AWTException, IOException, InterruptedException {
 Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
 Robot robot = new Robot();
 BufferedImage img = robot.createScreenCapture(new Rectangle(size));
 ImagePanel panel = new ImagePanel(img);
 frame=new JFrame();
 frame.add(panel);
 frame.setLocation(0, 0);
 frame.setSize(size);
 frame.setLayout(new FlowLayout());
 frame.setUndecorated(true);
 frame.setVisible(true);
 frame.addMouseListener(this);
 frame.addMouseMotionListener(this);
 frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 }

 public void draggedScreen() throws Exception {
 ScreenRecorder.c1=c1;
 ScreenRecorder.c2=c2;
 ScreenRecorder.c3=c3;
 ScreenRecorder.c4=c4;
 ScreenRecorder.isRegionSelected=true;
 JOptionPane.showMessageDialog(frame, "Region Selected.Please click on Start Recording button to record the selected region.");
 frame.dispose();
 }

 public void mouseClicked(MouseEvent arg0) {
 }

 public void mouseEntered(MouseEvent arg0) {
 }

 public void mouseExited(MouseEvent arg0) {
 }

 public void mousePressed(MouseEvent arg0) {
 paint();
 this.c1 = arg0.getX();
 this.c2 = arg0.getY();
 }

 public void mouseReleased(MouseEvent arg0) {
 paint();
 if (this.drag_status == 1) {
 this.c3 = arg0.getX();
 this.c4 = arg0.getY();
 try {
 draggedScreen();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 }

 public void mouseDragged(MouseEvent arg0) {
 paint();
 this.drag_status = 1;
 this.c3 = arg0.getX();
 this.c4 = arg0.getY();
 }

 public void mouseMoved(MouseEvent arg0) {
 }

 public void paint() {
 Graphics g = frame.getGraphics();
 frame.repaint();
 int w = this.c1 - this.c3;
 int h = this.c2 - this.c4;
 w *= -1;
 h *= -1;
 if (w < 0) {
 w *= -1;
 }
 g.drawRect(this.c1, this.c2, w, h);
 }
}


-
What is the commmand line to add watermark while screen recording using ffmpeg ? [duplicate]
11 septembre 2020, par Yong JuI tried to record screen using ffmpeg commmand line. So, I have complete it using this commmand.
ffmpeg.exe -rtbufsize 1500M -f -y -rtbufsize 100M -f gdigrab -t 00:02:00 -framerate 30 0 0 -probesize 10M 1920 1080 -draw_mouse 1 -i desktop -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 30 -pix_fmt yuv420p output.avi".


Now, I want to add watermark while recording video.
If you have good experience this field, Please give me good advice.
Thanks for your attention.
Sincerely.


-
H264 decoding using ffmpeg
14 juillet 2016, par KindermannI’m trying to decode a video stream with ffmpeg library, that’s how I do it basically :
void video_decode(const char *filename)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int frame_count=0;
FILE *f;
AVFrame *frame;
uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
AVPacket avpkt;
av_init_packet(&avpkt);
memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
printf("Decoding video file...\n");
/* find the h264 video decoder */
codec = avcodec_find_decoder(AV_CODEC_ID_H264);
c = avcodec_alloc_context3(codec);
c->bit_rate = 400000;
c->width = 1920;
c->height = 1080;
if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "Could not open codec\n");
exit(1);
}
frame = av_frame_alloc();
for (;;) {
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
if (avpkt.size == 0)
break;
avpkt.data = inbuf;
while(avpkt.size > 0){
int len, got_frame;
len = avcodec_decode_video2(c, frame, &got_frame, &avpkt);
if (len < 0) {
fprintf(stderr, "Errr while decding frame %d\n", frame_count);
exit (1);
}
if (got_frame) {
//Print out frame information..
}
if (avpkt.data) {
avpkt.size -= len;
avpkt.data += len;
}
}
}
}But I got the following outputs :
Decoding video file...
[h264 @ 0x303c040] decode_slice_header error
[h264 @ 0x303c040] decode_slice_header error
[h264 @ 0x303c040] decode_slice_header error
[h264 @ 0x303c040] no frame!
Errr while decding frame 0Obviously the initiation of codec was incomplete. Do you have experience with h264 api ? Any help would be appreciated.
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