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• How to stream live video from DJI Professional 3 camera ?

  5 juin 2017, par raullalves

  I have to get the live stream video from DJI Phantom 3 camera in my C++ application, in order to do a Computer Vision processing in OpenCV.

  First I tried sending the H264 raw data through an UDP socket, inside this callback :

          mReceivedVideoDataCallBack = new CameraReceivedVideoDataCallback() {
  
  
  
          @Override
  
          public void onResult(byte[] videoBuffer, int size) {
  
              //Here, I call a method from a class I created, that sends the buffer through UDP
  
              if (gravar_trigger) controleVideo.enviarFrame(videoBuffer, size);
  
  
  
              if (mCodecManager != null)  mCodecManager.sendDataToDecoder(videoBuffer, size);
  
  
  
          }
  
  
  
      };

  That communication above works well. However, I haven’t been able to decode that UDP H264 data in my C++ desktop application. I have tested with FFmpeg lib, but couldn’t get to alocate an AVPacketwith my UDP data, in order to decode using avcodec_send_packet and avcodec_receive_frame. I also had problems with AVCodecContext, since my UDP communication wasn’t a stream like RTSP, where it could get information about its source. Therefore, I had to change how I was trying to solve the problem.

  Then, I found libstreaming, in which can be associate to stream the android video camera to a Wowza Server, creating something like a RTSP stream connection, where the data could be obtained in my final C++ application easily using OpenCV videoCapture. However, libstreaming uses its own surfaceView. In other words, I would have to link the libstreaming surfaceView with the DJI Drone’s videoSurface. I’m really new to Android, so don’t have any clue of how to do that.

  To sum up, is that the correct approach ? Someone has a better idea ? Thanks in advance

• Notepad++ UTF8 Convert Programmatically

  29 décembre 2016, par user3393046

  I have one subtitle file, that is NOT in utf-8, and i’m using FFmpeg to encode the the subtitle into a matroska container.

  FFmpeg says that my file is NOT in UTF-8 Format when i’m trying to encode it, so i used NotePad++ Function to convert the file to UTF-8.

  I did re-encode with FFmpeg, and the subtitles file worked fine without any issues.

  I tried to do the encoding to UTF-8, using PHP & linux in general and although the file successfully converted to UTF-8, in the output , all characters are broken.

  I have tried iconv, recode, enca everything that you have imagine, and even PHP Code, with almost any snippet i found on the internet, and always i get broken characters.

  What Notepad++ pro-grammatically does more, and i always have good results with it ?

  Does someone know ?

• Run selected line in notepad++ console

  9 mars 2016, par Mpondomise

  This might seem a bit too obvious but I am stuck with it anyway.
  I am editing an ffmpeg code in notepad++ and I want to run the selected line of code directly in notepad++ console (nppexec plugin console).
  say, I have four lines of code, and I want to run only the second line (selected line) :
  
  

  currently, I am coping the line and pasting it in the console and hitting enter. I know it is very noobie !
  Please help to achieve this with a shortcut or something.