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• Combining Youtube-dl and FFMPEG not working

  13 juillet 2019, par user1029296

  I am trying to download 5 second samples for a list of youtube video. The traditional approach is to download the entire file with "youtube-dl" and then use "ffmpeg" to split it however you want it.

  I am trying to use the following method : https://github.com/ytdl-org/youtube-dl/issues/622#issuecomment-162337869

  It does work when I include the variables in the command, for example :

  ffmpeg -ss 0 -i $(youtube-dl -f best --get-url https://www.youtube.com/watch?v=ySVi-0RS5vI&t=5s) -t 10 -c:v copy -c:a copy title2.mp4

  However, I am having issues trying to automate the system. Specifically, I would like ffmpeg and youtube-dl to read a file and use the values. I created the file "youtube.txt" which includes the following codes :

  440.8,https://www.youtube.com/watch?v=0-4wOE_DNeA,661.2,881.6,0-4wOE_DNeA
  
  330,https://www.youtube.com/watch?v=0-AMWW6tHzw,495,660,0-AMWW6tHzw
  
  509.2,https://www.youtube.com/watch?v=0-Rmto2rgMw,763.8,1018.4,0-Rmto2rgMw
  
  427.6,https://www.youtube.com/watch?v=0-U53qm45cA,641.4,855.2,0-U53qm45cA
  
  320.4,https://www.youtube.com/watch?v=0-dja9Ys4Sg,480.6,640.8,0-dja9Ys4Sg
  
  343.6,https://www.youtube.com/watch?v=0-g_PulsqtM,515.4,687.2,0-g_PulsqtM
  
  415.6,https://www.youtube.com/watch?v=0-nniRyn7dU,623.4,831.2,0-nniRyn7dU
  
  431.2,https://www.youtube.com/watch?v=006BQU3BFxw,646.8,862.4,006BQU3BFxw

  I am using the following command :

  parallel -j 6 --colsep ',' ffmpeg -ss {1} -i $(youtube-dl -f best --get-url {2}) --t 5 -c:v copy -c:a copy {5} :::: youtube.txt

  However, I get the following errors :

  ERROR: '{2}' is not a valid URL. Set --default-search "ytsearch" (or run  youtube-dl "ytsearch:{2}" ) to search YouTube
  
  --t: No such file or directory

  Would you mind helping me ?

  Thanks !

• 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.

• 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/