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• Watch multi-stream video file while being recorded by ffmpeg

  20 janvier 2020, par Luke Gorrie

  I am using ffmpeg to record four 1080p video streams simultaneously and I would like to view these streams in real time while they are being recorded. Ideally I would like to view them from a separate machine, using some convenient Linux data sharing method like ssh/sshfs/..., but that is a nice-to-have. Is there a practical way to accomplish this ?

  The ffmpeg recording command that I currently use is like this :

  ffmpeg \
  
    -f v4l2 -i $cam0 \
  
    -f v4l2 -i $cam1 \
  
    -f v4l2 -i $cam2 \
  
    -f v4l2 -i $cam3 \
  
    -f matroska \
  
    -map 0 \
  
    -map 1 \
  
    -map 2 \
  
    -map 3 \
  
    -c copy \
  
    $output.mkv

  My problem would be solved if I could use a command like ffplay or vlc to play one or more of the video streams, always tracking close to the end of the stream, playing more as data becomes available. I haven’t found such an option though.

  One alternative might be to have the recording ffmpeg process also tile the four 1080p videos into one 4K grid and pipe that to ffplay. Then I could at least preview on the same machine that is recording. I have not been able to work out the right ffmpeg command to do the tiling though and would appreciate an example.

• How can I watch my video from a sdp file ?

  7 avril 2019, par Marco Peca

  I’m using ffmpeg to create a streaming. It works fine. I have a server and with ffplay I can watch my stream.
  My only (big) constraint is real time.

  I have to embed it into an HTML page accessible from mobile devices.
  I tried with HTML5 video tag but I can’t include sdp files into it.

  With ffmpeg I create a stream from my webcam. I have also created the sdp file but in HTML5 doesn’t work.

  The code is here :

  ffmpeg server :

  sudo ffmpeg -re -f video4linux2 -i /dev/video0 -fflags no buffer rtp://224.10.20.30:20000

  file.sdp

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 224.10.20.30
  
  t=0 0
  
  a=tool:libavformat 55.7.100
  
  m=video 20000 RTP/AVP 96
  
  b=AS:200
  
  a=rtpmap:96 MP4V-ES/90000
  
  a=fmtp:96 profile-level-id=1

  ffplay : (It works)

  ffplay file.sdp

  How can I view the stream in a browser ?

• No Implementation Found for init method in Youtube Live Streaming Watch me project

  17 mai 2017, par Basha

  I am new to android development.presently I am Working on Youtube Live Streaming and downloaded watchMe project.I am getting the error in my class where I used to load FFMPEG libffmpeg.so file and the error was cannot resolve "init" method. and getting error while running the application as below

  java.lang.UnsatisfiedLinkError: No implementation found for boolean com.google.sai.apps.watchme.Ffmpeg.init(int, int, int, java.lang.String) (tried Java_com_google_sai_apps_watchme_Ffmpeg_init and Java_com_google_sai_apps_watchme_Ffmpeg_init__IIILjava_lang_String_2)
  
                                                                                       at com.google.sai.apps.watchme.Ffmpeg.init(Native Method)
  
                                                                                       at com.google.sai.apps.watchme.VideoStreamingConnection.open(VideoStreamingConnection.java:71)
  
                                                                                       at com.google.sai.apps.watchme.StreamerService.startStreaming(StreamerService.java:73)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity.startStreaming(StreamerActivity.java:163)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity.access$200(StreamerActivity.java:39)
  
                                                                                       at com.google.sai.apps.watchme.StreamerActivity$1.onServiceConnected(StreamerActivity.java:55)
  
                                                                                       at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1223)
  
                                                                                       at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1240)
  
                                                                                       at android.os.Handler.handleCallback(Handler.java:739)
  
                                                                                       at android.os.Handler.dispatchMessage(Handler.java:95)
  
                                                                                       at android.os.Looper.loop(Looper.java:148)
  
                                                                                       at android.app.ActivityThread.main(ActivityThread.java:5438)
  
                                                                                       at java.lang.reflect.Method.invoke(Native Method)
  
                                                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:762)
  
                                                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:652)
  
      05-17 11:31:41.415 23434-25678/com.google.sai.apps.watchme E/ImageFetcher: Error in downloadBitmap - java.io.FileNotFoundException: https://i.ytimg.com/vi/FFvfpXcOpYk/default_live.jpg

  and FFMPEG class was

  public class Ffmpeg {
  
  
  
  
  
      static {
  
          System.loadLibrary("ffmpeg");
  
      }
  
  
  
  
  
      public static native boolean init(int width, int height, int audio_sample_rate, String rtmpUrl);
  
  
  
      public static native void shutdown();
  
  
  
      // Returns the size of the encoded frame.
  
      public static native int encodeVideoFrame(byte[] yuv_image);
  
  
  
      public static native int encodeAudioFrame(short[] audio_data, int length);
  
  }

  please someone help me.