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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 !

  


• Save live video stream .m3u8 to MP4. Video freezes for a few seconds

  11 octobre 2020, par Frodo Baggins

  I am trying to save in MP4 an .m3u8 live stream using FFMPEG.

  


  The version in use is the following : $ ffmpeg -v
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1 18.04)

  


  While the command used for saving the stream in MP4 is the the one below :

  


  ffmpeg -y -i https://stream.m3u8 —map 0 —vcodec copy -acodec copy / output.mp4

  


  The file can be successfully opened and played with VLC even though every 3-5 seconds I see that the video freezes every few seconds.

  


  I wonder if it's something that I am missing in the above command.

  


  I also verified whether the issue was related to the connection in use but it does not seem related.

  


• 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 ?