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• Read h264 stream from an IP camera

  13 juillet 2015, par João Neves

  Currently, I am trying to use opencv to read a video from my Canon VB-H710F camera.

  For this purpose I tried two different solutions :

  SOLUTION 1 : Read the stream from rtsp address

   VideoCapture cam ("rtsp://root:camera@10.0.4.127/stream/profile1=u");
  
  
  
   while(true)
  
    cam >> frame;

  In this case I am using opencv to directly read from a stream encoded with in H264 (profile1), however this yields the same problem reported here http://answers.opencv.org/question/34012/ip-camera-h264-error-while-decoding/
  As suggested in the previous question, I tried to disable FFMPEG support in opencv installation, which solved the h264 decoding errors but raised other problem.
  When accessing the stream with opencv, supported by gstreame, there is always a large delay associated.
  With this solution I achieve 15 FPS but I have a delay of 5 seconds, which is not acceptable considering that I need a real time application.

  SOLUTION 2 : Read the frames from http address
  while(true)
  
  startTime=System.currentTimeMillis() ;

          URL url = new URL("h t t p://[IP]/-wvhttp-01-/image.cgi");
  
          URLConnection con = url.openConnection();
  
          BufferedImage image = ImageIO.read(con.getInputStream());   
  
          showImage(image);
  
          estimatedTime=System.currentTimeMillis()-startTime;
  
          System.out.println(estimatedTime);
  
          Thread.sleep(5);
  
  }

  This strategy simply grabs the frame from the url that the camera provides. The code is in Java but the results are the same in C++ with the curl library.
  This solution avoids the delay of the first solution however it takes little more than 100 ms to grab each frame, which means that I can only achieve on average 10 FPS.

  I would like to know how can I read the video using c++ or another library developed in c++ ?

• How to retransmit RTSP stream to media server Qt C++

  10 juillet 2021, par vishal dharankar

  I have an application where I receive a RTSP stream on a local IP address . This stream I want to retransmit to a media server which runs on public IP.

  


  Is it possible to forward such stream to next server without deciding and encoding this saving computations ?

  


  Can we use Gstreamer or any other similar library for this ?

  


  Sorry for not attaching any code since I am not sure where to start and what can be a specific library for this .

  


  Any pointers are helpful

  


• ffmpeg , 2 network cards and multicast stream

  18 juin 2015, par dropbasket

  my knowledge of networks are very poor !!, am a newbie !! ;-)

  I have a small server streaming ffmpeg installed on nginx with 2 network interfaces

  p2p1 is used for WAN which provides http/ssh....

  p4p1 is used to receive multicast data from intranet.

  192.168.0.1 is public network gateway.

  192.168.1.1 is private network gateway (commented for not have internet exit this network)

  239.0.0.*/24 is multicast address.

  Linux distribution
  
  3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  
  Distributor ID : Ubuntu
  
  Description: Ubuntu 14.04.2 LTS
  
  Release : 14.04
  
  Codename : trusty

  My network interfaces config

  auto lo
  
  iface lo inet loopback
  
  
  
  # NET1
  
  auto p2p1
  
  iface p2p1 inet static
  
          address 192.168.0.100
  
          netmask 255.255.255.0
  
          gateway 192.168.0.1
  
  
  
  # NET2
  
  auto p4p1
  
  iface p4p1 inet static
  
          address 192.168.1.100
  
          netmask 255.255.255.0
  
      ### gateway 192.168.1.1

  Now my route table

  root@srv:# route
  
  Tabla de rutas IP del núcleo
  
  Destino         Pasarela        Genmask         Indic Métric Ref    Uso Interfaz
  
  default         192.168.0.1     0.0.0.0         UG    0      0        0 p2p1
  
  192.168.0.0     *               255.255.255.0   U     0      0        0 p2p1
  
  192.168.1.0     *               255.255.255.0   U     0      0        0 p4p1

  I’m using udpxy on port 4022 for converting IPTV multicast to unicast HTTP

  udpxy -p 4022

  I execute this

  /usr/bin/ffmpeg -i "http://127.0.0.1:4022/rtp/239.0.0.76:8208" -map 0:0 -map 0:1 -c:v libx264 -vf scale=-1:720 -r 25 -profile:v high -level:v 4.0 -crf 18 -preset veryfast -maxrate 2000k -bufsize 2200k -c:a aac -ab 128k -strict -2 -ac 2 -f flv rtmp://127.0.0.1:11111/rtmp/channel1;
  
  
  
  
  
  ffmpeg version 2.7 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvo-aacenc --enable-libvidstab
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  http://127.0.0.1:4022/rtp/239.0.0.76:8208: Invalid data found when processing input

  as I can solve this problem ??
  Thanks in advance