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• How to write the Mat/Image to the RTMP stream in OpenCV

  27 octobre 2018, par Bahramdun Adil

  I can open RTSP video stream by using the VideoCapture and read the frames.

  It is the URL of RTSP stream :

  rtsp://username:password@xxx.xxx.xxx.xxx:554/Streaming/Channels/102

  Now I want to send/write the image/mat back to the output stream (RTMP stream over LAN network)

  I have already set up the RTMP server which is NGINX, and for a test, I downloaded the FFMPEG, and when running the following command (in CMD) then it works well, and successfully read and write the stream to NGINX server.

  ffmpeg -i rtsp://username:password@xxx.xxx.xxx.xxx:554/Streaming/Channels/102 -vcodec copy -acodec copy -f flv rtmp://xxx.xxx.xxx.xxx:1395/mylive/test

  And now if I put this rtmp://xxx.xxx.xxx.xxx:1395/mylive/test URL to the video tag of HTML, then the video can be opened.

  So the question is how I can push the image through RTMP (NGINX) from my code after processing ?

  Any suggestion. Thanks in advance !!

  Edit :

  I used VideoWriter class as the following ways, but no one was working :

  VideoWriter writer = new VideoWriter();
  
  writer.open("rtmp://xxx.xxx.xxx.xxx:1395/mylive/test", CAP_FFMPEG, 0, 25, 
  
  new Size(640, 480));
  
  //writer.open("ffmpeg -vcodec copy -acodec copy -f flv 
  
  //rtmp://xxx.xxx.xxx.xxx:1395/mylive/test", CAP_FFMPEG, 0, 25, new Size(640, 
  
  //480));
  
  // or without CAP_FFMPEG
  
  if (!writer.isOpened()) {
  
      System.out.println("open error");
  
  }

• compiling ffmpeg for iPhone SDK 4.3 [error : is unable to create an executable file.]

  12 février 2012, par user509020

  Like many others.. I'm compiling ffmpeg using gas preprocessor

  http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/077701.html

  This is my command

  ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk --enable-cross-compile --target-os=darwin --arch=arm7 --cpu=cortex-a8 --enable-pic

  the error :

  /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 is unable to create an executable file.
  
  C compiler test failed.

  I looked up the /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ folder using Finder..
  arm-apple-darwin10-gcc-4.2.1 was there..

  Thanks,
  Suhas

• iphone ios sample ffplay main.c —> FFmpeg.c change and input parameter , following errer please advice

  4 août 2017, par 224ok

  FFmpeg main c source

  int main(int argc, char **argv)
  
  {
  
  
  
      int flags, i;
  
      argv[1] = "-i";
  
      argv[2] = "ipod-library://item/item.mp3?id=1218551163727305907";    
  
           //argv[2] = "mon.mp3";
  
  
  
      argv[3] = "-acodec";
  
      argv[4] = "libfaac";
  
      argv[5] = "-ac";
  
      argv[6] = "2";
  
      argv[7] = "-ar";
  
      argv[8] = "44100";
  
      argv[9] = "-ab";
  
      argv[10] = "128k";
  
      argv[11] = "output.aac";
  
      argv[3] = "-vn";
  
      argv[4] = "-acodec";
  
      argv[5] = "libfaac";
  
      argv[6] = "-ac";
  
      argv[7] = "2";
  
      argv[8] = "-ar";
  
      argv[9] = "44100";
  
      argv[10] = "-ab";
  
      argv[11] = "128k";
  
      argv[12] = "output.aac";
  
      //  argv[14] = "rtsp://video.bouygtel.fr/50400/tf1.sdp";
  
      argc += 12;

  error : ipod-library ://item/item.mp3 ?id=1218551163727305907 : No such file or directory
  and if
  argv[2] = "mon.mp3" ; ---> mon.mp3 : No such file or directory

  please advice.