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• Streaming videos from a Java backend

  11 mai 2014, par IAmYourFaja

  I was wondering how most multimedia Java shops handle video streaming. Say I want to build a website that has a page that uses the HTML5 video player like so :

      
  
          ...
  
      
  
      
  
          ... content up here
  
  
  
          <video width="500" height="500" controls="controls" src="path/to/video.mp4"></video>
  
  
  
          ... more content down here

  Say the URL for this page is http://myapp.example.org/video. When HTTP requests for the /video path reach the myappp.example.org servers, I guess I have a few options :

  • Route the request to a web app server (Tomcat/Jetty), and try to figure out how to stream the video.mp4 video directly off that server using pure Java ; or
  • Route the request to a media server, and somehow stream video.mp4 from that media server directly back to the client ; or
    • On this end I’ve heard of servers like Red5 or Wowza
  • Route the request to a media server (again, Red5/Wowza), and somehow stream video.mp4 through the web app server acting as a middleman

  There may be other options that I’m aware of (in which case, what are they ???). My questtion :

  How is A/V streaming typically handled from behind a Java backend ?

• Optimizing MP4 Video for Fast Streaming using java

  15 juin 2021, par mukesh

  Is there any Java API to Optimising MP4 Video for Fast Streaming (faststart).

  


  I have tried following command and it's worked well. but i want to achieve it by java like when i upload file it Optimise it and save to directory.

  


  String cmd = "/Downloads/ffmpeg  -i /Downloads/wall_1623406694548_slcspq.mp4 -movflags faststart -acodec copy -vcodec copy /Downloads/optimised.mp4";
Runtime run = Runtime.getRuntime();
Process pr = run.exec(cmd);
pr.waitFor();
BufferedReader buf = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line = "";
while ((line = buf.readLine()) != null) {
    System.out.println(line);
}


  


• Trying to read streaming video using OpenCVSharp4

  7 septembre 2022, par AlvinfromDiaspar

  I'm just not having any luck whatsoever with this.
I'm calling OpenCvSharp.VideoCapture("udp ://0.0.0.0:11111") to try to read a video stream.
This does not work, and the documentation seems like it doesnt support streaming.

  



  I've also tried (without success) trying to grab images using OpenCvSharp, but i've no idea how to do that. Documentation for it doesn't show any indication this is possible as well.

  



  The snippet for this is here :

  



  


          var vc = new OpenCvSharp.VideoCapture("udp://0.0.0.0:11111");

        if (!vc.IsOpened())
        {
            vc.Open("udp://0.0.0.0:11111");
        }

        while (true)
        {
            var matImage = new OpenCvSharp.Mat();
            if (vc.Read(matImage))
            {
                try
                {
                    var bmp = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(matImage);
                    using (var ms = new MemoryStream())
                    {
                        var bmpImg = new BitmapImage();
                        bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
                        bmpImg.StreamSource = ms;
                        this.videoFrameImage.Background = new ImageBrush(bmpImg);
                        this.isReadingVideoStream = true;
                    }
                }
                catch
                {
                    // just swallow exception
                }
            }
        }


  


  



  Before trying OpenCvSharp (which seemed extremely promising), I tried using ffmpeg with mild/partial success. I was able to extra a frame from the real-time streaming video and save it to a file. Unfortunately, the behavior was not consistent. Sometimes it saves images, sometimes it doesn't. And when it does save images it's usually just a handful (even though the video is constantly being streamed).

  



  The command line for this is here :

  



  


  ffmpeg.exe -i udp ://0.0.0.0:11111 -ss 00:00:01 -vframes 1 -q:v 1 -y
 filename.jpg

  


  



  I may go back to trying again with ffmpeg as im getting absolutely nowhere with OpenCvSharp.
Wondering if anybody out there has been successfully implementing with either one of these (or another way) ?

  



  * Update *

  



  I found a set of Nuget packages which does indicate support for streaming video.
The nugets are :

  



  

  • OpenCvSharp4

  


  • OpenCvSharp4.Windows

  


  • OpenCvSharp4.runtime.win

  


  



  But now i am currently facing a run-time error :

  



  Method not found: 'Void OpenCvSharp.VideoCapture..ctor(System.String, OpenCvSharp.VideoCaptureAPIs)'.


  



  Incidentally, i just raised this issue :