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• lavc : use a separate field for exporting audio encoder padding

  23 août 2014, par Anton Khirnov

  lavc : use a separate field for exporting audio encoder padding
  Currently, the amount of padding inserted at the beginning by some audio
  
  encoders, is exported through AVCodecContext.delay. However
  
   the term ’delay’ is heavily overloaded and can have multiple different
  
    meanings even in the case of audio encoding.
  
   this field has entirely different meanings, depending on whether the
  
    codec context is used for encoding or decoding (and has yet another
  
    different meaning for video), preventing generic handling of the codec
  
    context.
  Therefore, add a new field — AVCodecContext.initial_padding. It could
  
  conceivably be used for decoding as well at a later point.
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/ac3enc.c
  • [DH] libavcodec/audio_frame_queue.c
  • [DH] libavcodec/avcodec.h
  • [DH] libavcodec/g722enc.c
  • [DH] libavcodec/libfaac.c
  • [DH] libavcodec/libfdk-aacenc.c
  • [DH] libavcodec/libmp3lame.c
  • [DH] libavcodec/libopencore-amr.c
  • [DH] libavcodec/libopusenc.c
  • [DH] libavcodec/libspeexenc.c
  • [DH] libavcodec/libtwolame.c
  • [DH] libavcodec/libvo-aacenc.c
  • [DH] libavcodec/libvo-amrwbenc.c
  • [DH] libavcodec/libvorbis.c
  • [DH] libavcodec/mpegaudioenc.c
  • [DH] libavcodec/nellymoserenc.c
  • [DH] libavcodec/ra144enc.c
  • [DH] libavcodec/utils.c
  • [DH] libavcodec/version.h
  • [DH] libavcodec/wmaenc.c

• How can I rename a file from a txt file with Windows bat file ?

  12 septembre 2022, par user1264599

  I have a batch script that renames a file to input.mkv so it can be processed by a string of other commands in the bat file with a final file called ProcessedVideo.mkv. I capture the OG file name using "dir *.mkv /b>OG_FileName.txt" before being renamed.

  


  How can I rename the final processed mkv file to the name captured in the OG_FileName.txt and maybe add "_Added-Text.mkv" as the last part of my Batch Script ? (Adding text to the file name is not that important if it is too much trouble).

  


  I really thought this would be easy but I'm defeated.

  


• Realtime video processing with javacv on Android

  7 août 2014, par moonie

  I wish to do realtime video processing on Android using opencv/javacv. My basic approach can be summarized as follow :

  onCreate(), generating a new JavaCameraView

  mCameraView = new JavaCameraView(this, mCameraIndex);
  
  mCameraView.setCvCameraViewListener(this);   
  
  setContentView(mCameraView); 

  when the user clicks a button, a ffmpegframe recorder is created

  try{
  
              final long currentTimeMillis = System.currentTimeMillis();
  
              final String appName=getString(R.string.app_name);
  
              final String galleryPath=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString();
  
              final String albumPath=galleryPath+"/"+appName;
  
              final String photoPath=albumPath+"/"+currentTimeMillis+".avi";
  
              FFmpegFrameRecorder recorder=FFmpegFrameRecorder.createDefault(photoPath, 640, 360);
  
              recorder.setFrameRate(30);
  
              recorder.start();
  
              }catch(FrameRecorder.Exception e){
  
              e.printStackTrace();
  
              }

  then for each CameraFrame, use the following code to process and save the frame

      public Mat onCameraFrame(final CvCameraViewFrame inputFrame){
  
      final Mat rgba = inputFrame.rgba();
  
      //...apply some filters on rgba
  
      if(mIsTakingVideo){
  
          try{
  
            recorder.record(MatToIplImage(rgba,640,320));           
  
          }catch(FrameRecorder.Exception {
  
              e.printStackTrace();
  
              }       
  
      }
  
      return rgba;
  
  }
  
  
  
   public IplImage MatToIplImage(Mat m){
  
    Bitmap bmp=Bitmap.createBitmap(m.width(), m.height(), Config.ARGB_8888);
  
    Utils.matToBitmap(m, bmp);
  
    IplImage image=IplImage.create(m.width(),m.height(),IPL_DEPTH_8U,1);
  
    bmp.copyPixelsToBuffer(image.getByteBuffer());
  
    return image;}

  When the user clicks the button again, the recorder is stopped and released. However the video I create is an empty video. Any idea why ?

  EDIT :
  The video was empty because the format avi is not supported on my test phone...
  Now the video is not empty but it has the following errors

  1. The recorded video has two split windows instead of just one window
  2. The color is very different from the object I recorded
  3. The play rate is too fast.