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• Streaming opencv to youtube with ffmpeg

  29 juin 2020, par Tim Treurniet

  I am trying to live stream to youtube from a c++ opencv project. Currently, my program outputs a RTMP stream which nginx should push to youtube. A problem I'm having is youtube's requirement for an audio stream.

  


  I'm trying a workaround by restreaming using ffmpeg. It adds an empty audio stream (not efficient). Another issue is the output speed of my program which is around 10 fps. When playing in vlc or youtube, the stream buffers for a while and plays a few seconds of smooth video. How should I set this up in c++ to play a constant stream with lower fps, including an empty audio stream ?
Example I used : https://github.com/andreanobile/opencv_ffmpeg_streaming

  


  FFMPEG for adding audio :
ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -hwaccel cuvid -i rtmp ://localhost/live -vf scale=3840:2160 -c:v h264_nvenc -preset fast -maxrate 6000k -pix_fmt yuv420p -g 50 -b:a 160k -ac 2 -c:a aac -f flv rtmp ://a.rtmp.youtube.com/live2/

  


• Can not get frames from youtube video using FFmpegMediaMetadataRetriever

  27 juin 2019, par Ahasan Ratul

  I have been trying to extract a frame from a youtube video using FFmpegMediaMetadataRetriever in my android studio project. whenever I use the youtube url inside setDataSource, the app crashes. I am totally new in android studio and haven’t worked with FFmpeg before. I would appreciate if anyone can help me out. Also, I am sorry if I have asked a really silly/easy question.

  import wseemann.media.FFmpegMediaMetadataRetriever;
  
  .....
  
  
  
  private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
  
      @Override
  
      public void onManagerConnected(int status) {
  
          switch (status) {
  
              case LoaderCallbackInterface.SUCCESS: {
  
                  Log.i(TAG, "OpenCV loaded successfully");
  
                  mOpenCvCameraView.enableView();
  
                  try {
  
                      initializeOpenCVDependencies();
  
                  } catch (IOException e) {
  
                      e.printStackTrace();
  
                  }
  
              }
  
              break;
  
              default: {
  
                  super.onManagerConnected(status);
  
              }
  
              break;
  
          }
  
      }
  
  };
  
  
  
  
  
  private void initializeOpenCVDependencies() throws IOException {
  
  
  
      tick =0;
  
     //extract frame at 2 second using FFmpegMediaMetadataRetriever
  
      FFmpegMediaMetadataRetriever mmr = new FFmpegMediaMetadataRetriever();
  
      mmr.setDataSource("https://youtu.be/f-ehTcWC6dc");
  
      Bitmap b = mmr.getFrameAtTime(2000000, FFmpegMediaMetadataRetriever.OPTION_CLOSEST);
  
      mmr.release();
  
  
  
      objMat = new MatOfPoint2f();
  
      sceneMat = new MatOfPoint2f();
  
      obj_corners = new Mat(4, 1, CvType.CV_32FC2);
  
      img = new Mat();
  
      img2 = new Mat();
  
  }

  in the build.gradle, I have added the following dependencies

  dependencies {
  
  
  
         //FFmpegMediaMetadataRetriever dependencies
  
         implementation 'com.github.wseemann:FFmpegMediaMetadataRetriever:1.0.14'
  
  
  
         implementation project(path: ':openCVLibrary340dev')
  
  }

  error that I get is :

  E/AndroidRuntime : FATAL EXCEPTION : main
  Process : com.example.jeverfun, PID : 8877
  java.lang.RuntimeException : Unable to resume activity com.example.jeverfun/com.example.jeverfun.jevercamera : java.lang.IllegalArgumentException : setDataSource failed : status = 0xFFFFFFFF
  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3581)
  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3621)
  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2862)
  at android.app.ActivityThread.-wrap11(Unknown Source:0)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
  at android.os.Handler.dispatchMessage(Handler.java:106)
  at android.os.Looper.loop(Looper.java:164)
  at android.app.ActivityThread.main(ActivityThread.java:6494)
  at java.lang.reflect.Method.invoke(Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
  Caused by : java.lang.IllegalArgumentException : setDataSource failed : status = 0xFFFFFFFF
  at wseemann.media.FFmpegMediaMetadataRetriever.setDataSource(Native Method)
  at com.example.jeverfun.jevercamera.initializeOpenCVDependencies(jevercamera.java:373)
  at com.example.jeverfun.jevercamera.access$100(jevercamera.java:59)
  at com.example.jeverfun.jevercamera$1.onManagerConnected(jevercamera.java:347)
  at com.example.jeverfun.jevercamera.onResume(jevercamera.java:469)
  at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1355)
  at android.app.Activity.performResume(Activity.java:7117)
  at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3556)
  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3621) 
  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2862) 
  at android.app.ActivityThread.-wrap11(Unknown Source:0) 
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589) 
  at android.os.Handler.dispatchMessage(Handler.java:106) 
  at android.os.Looper.loop(Looper.java:164) 
  at android.app.ActivityThread.main(ActivityThread.java:6494) 
  at java.lang.reflect.Method.invoke(Native Method) 
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) 
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 
  I/MediaMetadataRetrieverJNI : release
  Application terminated.

• Download youtube videos with youtube-dl/ffmpeg in php

  24 juillet 2019, par Baraque Obahamas

  I have been using youtube-dl for a long time, and I now want to install it on my dedicated server to make it easier for me to download content.

  I created a php script that allows me to download the video of my choice to the server, then I download it to my computer, pretty cool !

  I am now trying to improve this script in order to redirect only the feed to avoid uploading the video to the server.

  Example with this site : https://mpgun.com
  It seems to redirect the stream without downloading the video to the server. If you try to download a video that lasts 3 hours, the site will offer you the download immediately !

  I think ffmpeg allows you to do that, only I don’t know where to start in the code.

  Do you have any idea how to set this up in php ?

  Thank you