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• MediaSource through socket stops

  23 août 2017, par Paulo Galdo Sandoval

  i’m trying to stream a rtsp live stream through socket.io using ffmpeg (this works fine), but now i need to get that video from the socket and play it on a HTML5 video tag.

  To do this i’m using MediaSurce, getting small pieces of video through the socket and then appending it to the MediaSource

  This solution reproduces the video a few seconds o minutes and then suddenly stops
  and it doesn’t throw me any error on the Chrome console

      var socket = io();
  
  
  
      var ms = new MediaSource();
  
      var sourceBuffer;
  
      var queue = [];
  
      var video = document.getElementById("video");
  
      video.src = window.URL.createObjectURL(ms);
  
  
  
      socket.on('start', function (response) {
  
          console.log(response);
  
          socket.emit('streaming', $stateParams.id);
  
          ms.addEventListener('sourceopen', videoLoad, false);
  
          ms.addEventListener('sourceclose', videoClosed, false);
  
      });
  
  
  
  
  
      function videoLoad() {
  
          sourceBuffer = ms.addSourceBuffer('video/webm; codecs="vorbis,vp8"');
  
          sourceBuffer.addEventListener('update', function () {
  
              if (queue.length > 0 && !sourceBuffer.updating) {
  
                  console.log(queue.length);
  
                  sourceBuffer.appendBuffer(queue.shift());
  
              }
  
          });
  
  
  
          socket.on('data', function (response) {
  
              var bytes = new Uint8Array(response);
  
              var blob = new Blob(bytes);
  
              console.log(blob.size);
  
              if (sourceBuffer.updating || queue.length > 0) {
  
                  queue.push(bytes);
  
              } else {
  
                  sourceBuffer.appendBuffer(bytes);
  
              }
  
          });
  
      }
  
  
  
      function videoClosed(e) {
  
          console.log('mediaSource readyState: ' + this.readyState);
  
      }

  On my chrome://media-internals/ the video players log show me a couple of time this, and then the video stops

  video_buffering_state   BUFFERING_HAVE_ENOUGH

• Repeating ffmpeg stream (libavcodec/libavformat)

  6 août 2017, par Cromon

  I am using the various APIs from ffmpeg to draw videos in my application. So far this works very well. Since I also have gifs I want to do looping without having to load the file over and over again.

  In my code the decoder loop looks like this :

   AVPacket packet = {};
  
   av_init_packet(&packet);
  
   while (mIsRunning) {
  
       int error = av_read_frame(mContext, &packet);
  
       if (error == AVERROR_EOF) {
  
           if(mRepeat) {
  
               logger.info("EOF-repeat");
  
               auto stream = mContext->streams[mVideoStream];
  
               av_seek_frame(mContext, mVideoStream, 0, 0);
  
               continue;
  
           }
  
           if (mReadVideo) {
  
               avcodec_send_packet(mVideoCodec, nullptr);
  
           }
  
           if (mReadAudio) {
  
               avcodec_send_packet(mAudioCodec, nullptr);
  
           }
  
           break;
  
       }
  
  
  
       if (error < 0) {
  
           char err[AV_ERROR_MAX_STRING_SIZE];
  
           av_make_error_string(err, AV_ERROR_MAX_STRING_SIZE, error);
  
           logger.error("Failed to read next frame from stream: ", err);
  
           throw std::runtime_error("Stream reading failed");
  
       }
  
  
  
       if (packet.stream_index == mVideoStream && mReadVideo) {
  
           int32 err;
  
           {
  
               std::lock_guard l(mVideoLock);
  
               err = avcodec_send_packet(mVideoCodec, &packet);
  
           }
  
           mImageEvent.notify_all();
  
           while (err == AVERROR(EAGAIN) && mIsRunning) {
  
               {
  
                   std::unique_lock l(mReaderLock);
  
                   mReaderEvent.wait(l);
  
               }
  
               {
  
                   std::lock_guard l(mVideoLock);
  
                   err = avcodec_send_packet(mVideoCodec, &packet);
  
               }
  
          } 
  
       }
  
  
  
       av_packet_unref(&packet);
  
   }

  Reading a video to the end works perfectly well and if I dont set mRepeat to true it properly EOFs and stops parsing. However when I use looping the following happens :

  • The video ends
  • AVERROR_EOF happens at av_read_frame
  • EOF-repeat is printed
  • A random frame is read from the stream (and rendered)
  • AVERROR_EOF happens at av_read_frame
  • EOF-repeat is printed
  • A random frame is read from the stream (and rendered)
  • ...

  You can imagine it like I have a gif of a spinning globe and after one full turn it just starts randomly jumping around, sometimes for a fraction of a second correctly, sometimes backwards and sometimes just randomly everywhere.

  I have also tried several versions with avformat_seek_file what other way would there be to reset everything to the beginning and start from scratch again ?

• FFmpegMediaPlayer : findLibrary returned null

  20 juillet 2017, par IceJOKER

  I use https://github.com/wseemann/FFmpegMediaPlayer in my application, but some Android device throw exception :

  java.lang.ExceptionInInitializerError
  
  at ru.mypackage.PlayService.initPlayer(PlayService.java:74)
  
  at ru.mypackage.PlayService.onCreate(PlayService.java:68)
  
  at android.app.ActivityThread.handleCreateService(ActivityThread.java:1949)
  
  at android.app.ActivityThread.access$2500(ActivityThread.java:117)
  
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:989)
  
  at android.os.Handler.dispatchMessage(Handler.java:99)
  
  at android.os.Looper.loop(Looper.java:130)
  
  at android.app.ActivityThread.main(ActivityThread.java:3687)
  
  at java.lang.reflect.Method.invokeNative(Native Method)
  
  at java.lang.reflect.Method.invoke(Method.java:507)
  
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
  
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
  
  at dalvik.system.NativeStart.main(Native Method)
  
  Caused by: java.lang.UnsatisfiedLinkError: Couldn't load avutil: findLibrary returned null
  
  at java.lang.Runtime.loadLibrary(Runtime.java:429)
  
  at java.lang.System.loadLibrary(System.java:554)
  
  at wseemann.media.FFmpegMediaPlayer.<clinit>(FFmpegMediaPlayer.java:620)
  
  ... 13 more
  
  </clinit>

  My project :
  
  

  Can somebody explain me what’s wrong there ?
  On my device and some other device the app working nice, but on some device (for example : Galaxy Ace (GT-S5830i) Android 2.3.3 - 2.3.7) it throw the exception.

  p.s. about "lib" prefix I understood ( https://developer.android.com/reference/java/lang/System.html#mapLibraryName(java.lang.String) )