Recherche avancée

Sur d’autres sites (10151)

• 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.

  


• 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 !

  


• How to save sequence of images in `000` pattern [on hold]

  17 mars 2014, par Maged E William

  i try to make video out of images, but i only know how to do that with one image like this :
  ffmpeg -f image2 -i C:\Secret\17_03_2014_11_31_34_AM\000.jpeg -r 12 -s 683x384 C:\Secret\17_03_2014_11_31_34_AM\foo.avi

  now here's my images looks like :

  

  i tried this :

  ffmpeg -f image2 -i C:\Secret\17_03_2014_11_31_34_AM\-%03d.jpeg -r 12 -s 683x384 C:\Secret\17_03_2014_11_31_34_AM\foo.avi

  but it says :

  could find no file with path 'C:\Secret\17_03_2014_11_31_34_AM\-%03d.jpeg' and index in the range 0-4
  
  C:\Secret\17_03_2014_11_31_34_AM\-%03d.jpeg: no such file directory
  
  >

  any help with converting all of them ?