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• 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();
  
          }

• Is there any (or possible) html5 player that play videos on different resolution without convertion the media file ?

  1er avril 2020, par In-my-country-we-dont-use-name

  I want to play videos on my website with a html5 media player.I found this for an example :

  



  https://plyr.io/

  



  but it needs different videos for every resolution with these codes :

  



   
                        
                        
                        


  



  I dont want convert media files with some convertion technologies for example ffMpeg, IF IT IS POSSIBLE.So, I want to learn how to play videos on different resolution without convertion.If you know a html5 player, you can suggest me.

  



  Its urgent.My company loses many thousand dollars everyday because of this problem.If we cant solve this, we cant save us from bankrupt.I dont want go to jail because of depts.