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• I can find file in my computer , but it can't open

  12 septembre 2020, par Wendy Chen

   using FFMPEG
 FFMPEG.exe("-i", "rtsp://......@.....", "-t" , "00:00:10","output.mp4")


  


  but it showed

  


   [udp @ 00000265e8aa8c80] 'circular_buffer_size' option was set but it is not 
 supported on this build (pthread support is required)
 [udp @ 00000265e8ab8f80] 'circular_buffer_size' option was set but it is not 
 supported on this build (pthread support is required)
 [udp @ 00000265e8ac9800] 'circular_buffer_size' option was set but it is not 
 supported on this build (pthread support is required)
 [udp @ 00000265e8ad9ac0] 'circular_buffer_size' option was set but it is not 
 supported on this build (pthread support is required)
 [rtsp @ 00000265e8aa6200] UDP timeout, retrying with TCP
 [rtsp @ 00000265e8aa6200] method PAUSE failed: 401 Unauthorized
 [rtsp @ 00000265e8aa6200] Could not find codec parameters for stream 0 (Video: h264, 
 none): unspecified size


  


  I can find file in my computer , but it can't play.
What I need to add ?

  


• Java open CV hangs on VideoCapture for file if openCV is loaded with nu.pattern.OpenCV.loadShared() ;

  30 septembre 2020, par Ilya Yevlampiev

  I have a sample code from https://ratiler.wordpress.com/2014/09/08/detection-de-mouvement-avec-javacv/ with small difference in loading the open cv library in the static block using nu.pattern.OpenCV.loadShared(); :

  


  import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.Size;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;
import org.opencv.imgproc.Imgproc;

public class JavaCVPrjt01 {
    static {
        //System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        nu.pattern.OpenCV.loadShared();
    }
    public static void main(String[] args) {
        JFrame jframe = new JFrame("HUMAN MOTION DETECTOR FPS");
        jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel vidpanel = new JLabel();
        jframe.setContentPane(vidpanel);
        jframe.setSize(1280,720) ;
        jframe.setVisible(true);

        Mat frame = new Mat();
        Mat outerBox = new Mat();
        Size sz = new Size(1280,720);
        VideoCapture camera = new VideoCapture("D:/Downloads/video4.mp4");

        while (true) {
            if (camera.read(frame)) {
                Imgproc.resize(frame,frame, sz );
                outerBox = new Mat(frame.size(), CvType.CV_8UC1);
                Imgproc.cvtColor(frame, outerBox, Imgproc.COLOR_BGR2GRAY);
                Imgproc.GaussianBlur(outerBox, outerBox, new Size(3, 3), 0);

                ImageIcon image = new ImageIcon(Mat2bufferedImage(outerBox));
                vidpanel.setIcon(image);
                vidpanel.repaint();

            }
        }
    }

    public static BufferedImage Mat2bufferedImage(Mat image) {
        MatOfByte bytemat = new MatOfByte();
        Imgcodecs.imencode(".jpg", image, bytemat);
        byte[] bytes = bytemat.toArray();
        InputStream in = new ByteArrayInputStream(bytes);
        BufferedImage img = null;
        try {
            img = ImageIO.read(in);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return img;
    }

}


  


  and of course, the needed dependencies were added :

  


      <dependency>&#xA;        <groupid>org.bytedeco.javacpp-presets</groupid>&#xA;        <artifactid>opencv</artifactid>&#xA;        <version>3.2.0-1.3</version>&#xA;    </dependency>&#xA;&#xA;    <dependency>&#xA;        <groupid>org.openpnp</groupid>&#xA;        <artifactid>opencv</artifactid>&#xA;        <version>3.2.0-1</version>&#xA;    </dependency>&#xA;

  


  so, code is executed right before

  


  VideoCapture camera = new VideoCapture("D:/Downloads/video4.mp4");


  


  where it hangs and I have no clues to check what is wrong on the JNI level there.

  


• C++ - FFmpeg can't open hevc encoded *.mkv

  6 octobre 2020, par emdou

  I finally got the courage to tackle ffmpeg in C++ (and in general) for a stream extracting app but i'm stuck at loading the AVFormatContext using avformat_open_input, here is the actual code :

  


  int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    AVFormatContext *formatContext = nullptr;
    AVDictionaryEntry *dictEntry = nullptr;
    int result = 0;
    char filePath[] = "C:/Users/username/Downloads/test.mkv";

    if ((result = avformat_open_input(&formatContext, filePath, NULL, NULL)) < 0){
        av_log(NULL, AV_LOG_ERROR, "Cannot open file\n");
        result = AVERROR(result);
        goto cleanup;
    }

    while ((dictEntry = av_dict_get(formatContext->metadata, "", dictEntry, AV_DICT_IGNORE_SUFFIX))){
        qDebug() << dictEntry->key << " : " << dictEntry->value;
    }

cleanup:
    if (result < 0){
        char err[1024];
        av_strerror(result, err, 1024);
        qDebug() << err;
    }
    avformat_close_input(&formatContext);

    return a.exec();
}


  


  I end up with an error -12 as in "Cannot allocate memory" and exit code -1073741510.
This same sample is tested on an .mp4 file wich works just fine. What am I doing wrong ?