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• JavaCV FFmpegFrameRecorder save images to video

  2 décembre 2024, par Learning from masters

  I am a bit confused about the use of JavaCV FFmpegFrameRecorder. I have several byte[] or short[] arrays (depending if my images are 8 or 16 bit) were I have the data related for several images. Now, my idea is to use JavaCPP to send each image to ffmpeg so it creates me a mute video from this collection at the framerate I wish. Up to now I have :

  



  package ffmpeg;

import java.awt.EventQueue;
import java.io.File;
import java.nio.Buffer;
import java.nio.ByteBuffer;

import javax.swing.JFrame;

public class rwa {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    rwa window = new rwa();
                    window.frame.setVisible(true);

                    Frame myframe = new Frame();
                    myframe .imageHeight = 100;
                    myframe .imageWidth = 200;
                    myframe .imageChannels = 1;
                    myframe .imageDepth = 8;

                    byte[] myimage = new byte[20000];

                    //all black
                    for (int j = 0; j/FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(dest);
                    record.setFrameRate(0.04);
                    record.setVideoCodec(13);
                    record.setFormat("mp4");
                    record.setPixelFormat(0);
                    record.setImageHeight(100);
                    record.setImageWidth(200);
                    record.setVideoBitrate(1000000);

                    record.start();
                    for (int i=0; i<100; i++){

                        if (myimage.length*(1+i)<20000) {
                         //this is just for debugging it. I'm creating a different image each frame to see if it works. In practice, I will read in each step the propper image
                        for (int j = myimage.length*i; j/record.record(myframe);
                    }
                    record.stop();
                    record.close();

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public rwa() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

}


  



  But I am getting errors like

  



  


  A fatal error has been detected by the Java Runtime Environment :

  
 


  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007fefe4511d3, pid=6432, tid=0x000000000000027c

  


  



  what is wrong there ? And how should I select the bitrate ? My images, at maximum, will be 16bit 1 channel 2048*2048 pixels.

  



  Thanks !

  


• ffmpeg, ffprobe : don’t "merge" side data into packet data by default

  9 mars 2017, par wm4

  ffmpeg, ffprobe : don’t "merge" side data into packet data by default
  Preparation for potentially disabling merged side data by default in the
  
  libs. Do this in particular because it affects fate tests.
  The changed tests either reflect added packet side data, or the changed
  
  packet size due to merged side data removal reducing the packet size.
  

  • [DH] ffmpeg_opt.c
  • [DH] ffprobe.c
  • [DH] libavformat/tests/seek.c
  • [DH] tests/ref/fate/gaplessenc-itunes-to-ipod-aac
  • [DH] tests/ref/fate/gaplessenc-pcm-to-mov-aac
  • [DH] tests/ref/fate/gaplessinfo-itunes1
  • [DH] tests/ref/fate/gaplessinfo-itunes2
  • [DH] tests/ref/fate/mov-aac-2048-priming
  • [DH] tests/ref/seek/cache-pipe
  • [DH] tests/ref/seek/extra-mp3
  • [DH] tests/ref/seek/lavf-ts
  • [DH] tests/ref/seek/mkv-codec-delay

• Streaming rtsp data to local mp4 file

  11 juillet 2017, par Pankhuri Agarwal

  How can I save live streaming data from a local camera transported by rtsp to my local memory in a .mp4 format.

  I am using Ubuntu 16.04 LTS and tried using ffmpeg 3.3 but nothing seemed to work properly.

  The goal will be to provide live feed by mp4 by html5 and perform some modification on mp4 data.

  Can anyone suggest how to make ffmpeg work or any other way ?