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• Unable to find/write moov atom in the mp4 recorded stream

  11 juillet 2014, par AnilJ

  I have written the following code to write the webcam feed into a file (.mp4) on disk. The program is successful, but when I try to play the file using player, it says "moov atom not found" and player is not showing anything. The file however is a valid mp4 file according to ffmpeg command.

  This is my main thread where I encode a picture every 30ms.

  public void run() {        
  
  
  
      // Set the thread rolling.
  
      mRunning = true;
  
  
  
      while (mRunning) {
  
          // and display it on the Java Swing window
  
          Record();
  
      }
  
  
  
      // clean up resources
  
      cleanup();
  
  }
  
  
  
  private void Record() {
  
  
  
      IVideoPicture picture = null;
  
      BufferedImage image = null;
  
  
  
      picture = GetNextPicture();
  
      image = Utils.videoPictureToImage(picture);
  
  
  
      if (picture != null) {  
  
          // If recording is enabled, record the webcam stream.
  
          if (mRecordStream) {
  
  
  
              // convert to the right image type
  
              BufferedImage bgrScreen = ConvertToType(image, BufferedImage.TYPE_3BYTE_BGR);
  
  
  
              // encode the image to stream #0
  
              mWriter.encodeVideo(0, bgrScreen, System.nanoTime() - mStartTime, TimeUnit.NANOSECONDS);
  
          }
  
  
  
          try {
  
              Thread.sleep(30);
  
          } catch (InterruptedException e) {
  
              return;
  
          }
  
      }
  
  }

  From the main thread, I do this when I want to stop the recording and close this recording thread. The cleanup() method is eventually called by the main thread to close the writer. The comment does says about writing the trailer (I guess moov atom), but it does not do it. Can someone please help me find where the problem is ?

  public void stopRecording() {      
  
      // Stop the thread loop.
  
      mRunning = false;
  
  }
  
  
  
  private void cleanup() {
  
  
  
      // tell the writer to close and write the trailer if  needed
  
      if (mWriter != null) {
  
          mWriter.close();
  
          mWriter = null;
  
      }
  
  
  
      if (mVideoCoder != null) {
  
          mVideoCoder.close();
  
          mVideoCoder = null;
  
      }
  
  
  
      if (mContainer != null) {
  
          mContainer.close();
  
          mContainer = null;
  
      }
  
  }

• ubuntu "make" can't find standard c libraries

  22 mai 2018, par Karthik Uday Kiran

  For the past few days, I was trying to configure ffmpeg for android in ubunut system.

  I’ve configured the ffmpeg but when i try to make using the command
  make -j3

  The error read :

  No such file or directory #include
  enter image description here

• How do I rotate a video around the vertical and horizontal axis by two different angles ?

  18 mai 2018, par Brutus Cruciatus

  My goal is to rotate a video around the vertical and horizontal axis by two different angles to get a certain perspective.

  Now perspective assumes coordinates of the current view to straighten the video, I want to create perspective with angles.

  I am sure, one can abuse the perspective filter to get what I want.

  How do I rotate a video around the vertical and horizontal axis by two different angles ?