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• Scroll playlist items into view. Cancel 'play next' timeout if user navigates previous/next etc.

  2 février 2015, par scottschiller

  Scroll playlist items into view. Cancel ’play next’ timeout if user navigates previous/next etc.

• Play audio from ffmpegframegrabber

  5 juillet 2013, par Shataya

  For an augmented reality app which should play videos, adjusted to the detected marker.
  I can't use the android video view as it is not possible to rotate it.
  Therefor I have imported the javacv and ffmpeg libraries.
  So far I can successfully render my video with opengl es but I have problems with the audio playback.

  I extract the frames with FFmpegFrameGrabber :

  grabber = new MyFFmpegFrameGrabber(Environment.getExternalStorageDirectory()+"/arvideo_"+fileName+".mp4");
  
  Frame frame = grabber.grabFrame();
  
  ....
  
  if(frame.samples != null) {     
  
     // I have my audio samples and then?     
  
  }

  I tried to playback the audio with the AudioTrack class.

  int bufferSize = AudioTrack.getMinBufferSize(grabber.getSampleRate(),AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);
  
  track = new AudioTrack(AudioManager.STREAM_MUSIC, grabber.getSampleRate(), AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize, AudioTrack.MODE_STREAM);
  
  track.play();
  
  
  
  // call track.write(....) ???

  I get only a static noise. I have read that the sample format is AV_SAMPLE_FMT_FLTP but android needs AV_SAMPLE_FMT_S16. That's why I tried to convert the samples with com.googlecode.javacv.cpp.swresample class. I think that I'm doing something wrong because I still have only noise.

  swrcontext = com.googlecode.javacv.cpp.swresample.swr_alloc();
  
  com.googlecode.javacv.cpp.swresample.swr_alloc_set_opts(swrcontext,AV_CH_LAYOUT_STEREO, avutil.AV_SAMPLE_FMT_FLTP, getSampleRate(), AV_CH_LAYOUT_STEREO, avutil.AV_SAMPLE_FMT_S16, getSampleRate(), 0, null);
  
  com.googlecode.javacv.cpp.swresample.swr_init(swrcontext);
  
  // ....
  
  PointerPointer inData =  samples_frame.data();
  
  PointerPointer outData = samples_frame.data();            
  
  com.googlecode.javacv.cpp.swresample.swr_convert(swrcontext, outData, samples_frame.nb_samples(), inData,  samples_frame.nb_samples());
  
  samples_frame = new AVFrame(outData);

  I really have no idea anymore... I hope anybody can help me. Thanks.

• Video compressed using ffmpeg-android-java library, does not play on Web browsers

  27 juin 2016, par Jay Donga

  I am capturing video using default camera in Android and compressing it using ffmpeg-android-java library.

  After successful compression, video is playing in MXPlayer app, but fails to play in Web browsers like Google Chrome, Firefox.

  What can be the reason ?

  I have shared my compression logic. What changes can I make here so it can play on browsers ?

  String[] str=new String[]{"-y" ,"-i",sourceFilename,"-strict","experimental","-s", "160x120","-r","25", "-vcodec", "mpeg4", "-b", "150k", "-ab","48000", "-ac", "2", "-ar", "22050", destinationFilename};
  
  
  
  try{
  
              FFmpeg ffmpeg = FFmpeg.getInstance(getActivity());
  
              ffmpeg.execute(str, new ExecuteBinaryResponseHandler() {
  
  
  
                  @Override
  
                  public void onStart() {}
  
  
  
                  @Override
  
                  public void onProgress(String message) {
  
                      Log.e("onProgress",message);
  
                  }
  
  
  
                  @Override
  
                  public void onFailure(String message) {
  
                      Log.e("onFailure",message);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String message) {
  
                      Log.e("onSuccess",message);
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {}
  
              });
  
          }  catch (FFmpegCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }