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

  29 avril 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

• 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

• Ffmpeg 4 audio and 1 video input to 4 video outputs performance issue

  22 février 2021, par Yusufu

  I have create 4 null sink pulse monitor and it works fine.
When I publish 4 output to rtmp audio having noise and stopping. When works with 2 outputs it works fine.
If I decrease the resolution from 1920x1080 to 1280*720 it works fine too.
Using 4 different audio inputs and 1 video input

  


  
SCREEN_WIDTH=1920
SCREEN_HEIGHT=1080
SCREEN_RESOLUTION=${SCREEN_WIDTH}x${SCREEN_HEIGHT}
COLOR_DEPTH=24
X_SERVER_NUM=2
VIDEO_BITRATE=3000
VIDEO_FRAMERATE=30
VIDEO_GOP=$((VIDEO_FRAMERATE))
AUDIO_BITRATE=160k
AUDIO_SAMPLERATE=44100
AUDIO_CHANNELS=1
#some codes here

ffmpeg -y\
  -hide_banner -loglevel error \
  -nostdin \
  -s ${SCREEN_RESOLUTION} \
  -r ${VIDEO_FRAMERATE} \
  -draw_mouse 0 \
  -f x11grab \
    -i ${DISPLAY} \
  -f pulse -i MySink1.monitor \
  -f pulse -i MySink2.monitor \
  -f pulse -i MySink3.monitor \
  -f pulse -i MySink4.monitor \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 1  ${RTMP_URL1} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 2  ${RTMP_URL2} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 3  ${RTMP_URL3} \
  -c:v libx264 \
    -pix_fmt yuv420p \
    -profile:v main \
    -preset veryfast \
    -minrate ${VIDEO_BITRATE} \
    -maxrate ${VIDEO_BITRATE} \
    -g ${VIDEO_GOP} \
    -map 0 -f flv -map 4  ${RTMP_URL4} \````
    
I guess I need some performance issue. How can I add **tee** or use one decoded video in all outputs.