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• lavf/matroskaenc.c : add early support for colour elements

  7 mars 2016, par Neil Birkbeck

  lavf/matroskaenc.c : add early support for colour elements
  Adding early support for a subset of the proposed colour elements
  
  according to the latest version of spec :
  
  https://mailarchive.ietf.org/arch/search/?email_list=cellar&gbt=1&index=hIKLhMdgTMTEwUTeA4ct38h0tmE
  Like matroskadec, I’ve left out elements for pix_fmt related things
  
   as there still seems to be some discussion around these.
  The new elements are exposed under strict experimental mode.
  Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/matroskaenc.c

• Record live stream using ffmpeg as Process in Java

  26 décembre 2020, par Serbroda

  I can not figure out how to start a Process in Java for recording a live stream with ffmpeg.

  



  I've tried several solutions, but my current code looks like this (simplified) :

  



  public void startDownload() {
    String[] processArgs = new String[] {
            "ffmpeg", 
            "-i", 
            "https://bitdash-a.akamaihd.net/content/sintel/hls/playlist.m3u8", 
            "-c", 
            "copy", 
            "-bsf:a", 
            "aac_adtstoasc", 
            "C:\\temp\\test.mp4"
    };
    ProcessBuilder processBuilder = new ProcessBuilder(processArgs);
    try {
        process = processBuilder.start();
        process.wairFor(); // Do I need this? Actually the stream is running forever until I stop it manually.
        BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = null;
        while ((line = br.readLine()) != null) { // this blocks forever
            System.out.println(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}


  



  The problem is, that something blocks the process from starting. In this example the br.readLine() blocks it forever and I can not get any output from the process.

  



  But after killing the jar / stopping launch config in Intellij, the process begins to work and I have to kill it via task manager.

  



  Running a process that is not recording a live stream like just executing ffmpeg works by the way.

  



  I'm using Windows, JDK 14, IntelliJ.

  


• What is the best way to stream live video from OpenCV to browser (native codecs) ?

  29 avril 2017, par trojek

  I have a webcam and I get a video to OpenCV, then I want to stream modified video to the browser.
  Currently, I’m using jsmpeg which works well for low video resolutions.

  On this page I found the list of codecs which are natively supported by Safari, Chrome, Firefox, Opera and IE browsers. For example, H.264 is supported by above browsers.

  How can I prepare stream from OpenCV, GStreamer or FFmpeg in order to get live streaming ?