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• gst-inspect-1.0 do not see avdec_h264

  16 octobre 2020, par Marat Zakirov

  Previously I installed gstreamer via conda and its (good) plugins
next I installed gst-libav via sudo apt-get install gstreamer1.0-libav next I used apt-file list gstreamer1.0-libav to see installation path and found it to be /usr/lib/x86_64-linux-gnu/gstreamer-1.0/ next I read running gstream manual and then

  


  GST_PLUGIN_PATH=/usr/lib/x86_64-linux-gnu/gstreamer-1.0/ gst-inspect-1.0 avdec_h264

(base) marat@user-System-Product-Name:~$ ls -lh /usr/lib/x86_64-linux-gnu/gstreamer-1.0/ | grep av
-rw-r--r-- 1 root root 181K мар 21  2020 libgstavi.so
-rw-r--r-- 1 root root  56K мар 21  2020 libgstinterleave.so
-rw-r--r-- 1 root root 251K дек  9  2019 libgstlibav.so
-rw-r--r-- 1 root root  15K мар 21  2020 libgstnavigationtest.so
-rw-r--r-- 1 root root  40K мар 21  2020 libgstwavenc.so
-rw-r--r-- 1 root root  48K мар 21  2020 libgstwavpack.so
-rw-r--r-- 1 root root  72K мар 21  2020 libgstwavparse.so


  


  It found many new modules but didn't found avdec_h264. What I am missing ?

  


  UPDATE :

  


  I just want way to use gstreamer via conda virtenv python appliation. If you know valid way to do so I will consider your reply as answer.

  


• Pulseaudio record multiple xfbv screens with python

  10 octobre 2020, par Eric Lagarda

  I’m trying to do something complicated and I need some help.

  


  I’m able to record a session (video and audio) with python using xvfb and ffmpeg.

  


  I just want to visit a page using selenium and record the video and audio. It’s working but when I try to run multiple instances, the audio is mixing between records.

  


  How can achieve that ? I’m using pulseaudio. I know that with alsa you can set like a interface per instance, but I don’t know how to do it.

  


  Thanks for you support and comments.

  


• xuggler : no video in encoded 3gp file

  1er août 2012, par khizar

  i am trying to encode videos into 3gp format using xuggler, i somehow got it to work, work as in the program stopped throwing errors and exceptions, but the new file that is created does not have any video. Now there is no error or exception for me to work with so i have stuck a wall.
  EDIT : Note the audio is working as it shud.

  This is the code for the main function where the listeners are configured

  IMediaReader reader = ToolFactory.makeReader("/home/hp/mms/b.flv") ;

      IMediaWriter writer = ToolFactory.makeWriter("/home/hp/mms/xuggle/a_converted.3gp", reader);
  
  
  
      IMediaDebugListener debugListener = ToolFactory.makeDebugListener();
  
      writer.addListener(debugListener);
  
  
  
      ConvertVideo convertor = new ConvertVideo(new File("/home/hp/mms/b.flv"), new File("/home/hp/mms/xuggle/a_converted.3gp"));
  
      // convertor.addListener(writer);
  
      reader.addListener(writer);
  
      writer.addListener(convertor);
  
  
  
      while (reader.readPacket() == null)
  
          ;

  And this is the code for the convertor that i wrote.

  public ConvertVideo(File inputFile, File outputFile)
  
  {
  
      this.outputFile = outputFile;
  
      reader = ToolFactory.makeReader(inputFile.getAbsolutePath());
  
      reader.addListener(this);
  
  }

  private IVideoResampler videoResampler = null;
  
  private IAudioResampler audioResampler = null;
  
  
  
  @Override
  
  public void onAddStream(IAddStreamEvent event)
  
  {
  
      if (writer == null)
  
      {
  
          writer = ToolFactory.makeWriter(outputFile.getAbsolutePath(), reader);
  
  
  
      }
  
  
  
      int streamIndex = event.getStreamIndex();
  
      IStreamCoder streamCoder = event.getSource().getContainer().getStream(streamIndex).getStreamCoder();
  
  
  
      if (streamCoder.getCodecType() == ICodec.Type.CODEC_TYPE_AUDIO)
  
      {
  
          streamCoder.setFlag(IStreamCoder.Flags.FLAG_QSCALE, false);
  
          writer.addAudioStream(streamIndex, 0, 1, 8000);
  
      }
  
      else if (streamCoder.getCodecType() == ICodec.Type.CODEC_TYPE_VIDEO)
  
      {
  
          streamCoder.setFlag(IStreamCoder.Flags.FLAG_QSCALE, false);
  
          streamCoder.setCodec(ICodec.findEncodingCodecByName("h263"));
  
          writer.addVideoStream(streamIndex, 0, VIDEO_WIDTH, VIDEO_HEIGHT);
  
  
  
      }
  
      super.onAddStream(event);
  
  }
  
  
  
  // //
  
  @Override
  
  public void onVideoPicture(IVideoPictureEvent event)
  
  {
  
      IVideoPicture pic = event.getPicture();
  
      if (videoResampler == null)
  
      {
  
          videoResampler = IVideoResampler.make(VIDEO_WIDTH, VIDEO_HEIGHT, pic.getPixelType(), pic.getWidth(), pic.getHeight(), pic.getPixelType());
  
      }
  
      IVideoPicture out = IVideoPicture.make(pic.getPixelType(), VIDEO_WIDTH, VIDEO_HEIGHT);
  
      videoResampler.resample(out, pic);
  
  
  
      IVideoPictureEvent asc = new VideoPictureEvent(event.getSource(), out, event.getStreamIndex());
  
      super.onVideoPicture(asc);
  
      out.delete();
  
  }
  
  
  
  @Override
  
  public void onAudioSamples(IAudioSamplesEvent event)
  
  {
  
      IAudioSamples samples = event.getAudioSamples();
  
      if (audioResampler == null)
  
      {
  
          audioResampler = IAudioResampler.make(1, samples.getChannels(), 8000, samples.getSampleRate());
  
      }
  
      if (event.getAudioSamples().getNumSamples() > 0)
  
      {
  
          IAudioSamples out = IAudioSamples.make(samples.getNumSamples(), samples.getChannels());
  
          audioResampler.resample(out, samples, samples.getNumSamples());
  
  
  
          AudioSamplesEvent asc = new AudioSamplesEvent(event.getSource(), out, event.getStreamIndex());
  
          super.onAudioSamples(asc);
  
          out.delete();
  
      }
  
  }

  I just cant seem to figure out where the problem is. I wud be thankful if someone wud plz point me in the right direction.

  EDIT : If i see the properties of my newly encoded video, its audio properties are set and its video properties are not i.e in video properties, dimension= 0 x 0, frame rate= N/A and codec= h.263. The problem here is the 0 x 0 dimension.