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• What is the "Error initializing filter 'drawtext' with args..." error in using of ffmpeg at c# process class ?

  7 novembre 2016, par parsa

  I used this below code for create a resolution of a video and write text on it.

      var proc = new System.Diagnostics.Process();
  
      strin OrginalResolution="nhd";
  
      proc.EnableRaisingEvents = false;
  
      proc.StartInfo.FileName = ffmpegPath;
  
      proc.StartInfo.Arguments = "-i \"" + fileIn +
  
                                 "\" -f mp4 -s " + OrginalResolution + " -vf drawtext=fontfile=/OtherProjects/ConvertProj/ff‌​mpeg/OpenSans-Reg‌​ular.ttf:text=Parsa" \"" + fileOut.Split('.')[0] +
  
                                 ".mp4";
  
      proc.StartInfo.UseShellExecute = false;
  
      proc.StartInfo.CreateNoWindow = false;
  
      proc.StartInfo.RedirectStandardOutput = true;
  
      proc.StartInfo.RedirectStandardError = true;
  
  
  
      proc.Start();
  
      proc.WaitForExit();
  
      string sdsd = proc.StandardError.ReadToEnd();
  
      proc.Close();

  I faced with this problem(some string output of StandardError is in below) :

  Fontconfig error: Cannot load default config file\r\n[Parsed_drawtext_0       
  
  @0000000002fd8c20] Cannot find a valid font for the family 
  
  Sans\r\n[AVFilterGraph @ 0000000000511660] Error initializing 
  
  filter'drawtext' with args 
  
  'fontfile=/OtherProjects/ConvertProj/ffmpeg/OpenSans-
  
  Regular.ttf:text=parsa'\r\nError opening 
  
  filters!\r\n

  In cmd the same argument value of process works fine.
  I read that this issue related to how to using quotation mark at using
  of text property of drawtext in ffmpeg.but I can’t find any
  solution for solving this issue.
  Can anyone help me ?

  Can anyone help me still ?Is this a bug ?
  I used any solutions for escape from : in my code,but can’t solve this problem.
  It can’t find font.I delete other filters of drawtext to findout that any of filters don’t mistake, but still error exists yet.

  expansion=none property of drawtext doesn’t influence on this case, for escape :.

• opencv_ffmpeg module crash (IP Camera)

  25 novembre 2016, par Suraksha Ajith

  I’m using IP webcam android app(It converts mobile camera into IP web camera).
  I’m running below code in Visual Studio 2015 with OpenCV 3.1.

  VideoCapture cap; Mat img;
  
  cap.open("http://192.168.0.101:8080/video?x.mjpeg");
  
  while(waitKey(33)!=27)
  
  {
  
      try{
  
          cap>>img;  //code crashes here
  
          if(img.empty())
  
          {
  
           cout<<"camera Closed"<code>

  Getting below error.cIf the internet connection is slow or if the Wi-Fi is disconnected in my android device the program crashes
  Error :

  Exception thrown at 0x0BF2F6F0 (opencv_ffmpeg310.dll) in test.exe :
  0xC0000005 : Access violation reading location 0x00000020.

  If there is a handler for this exception, the program may be safely
  continued.

  even if the code is wrapped within try catch block, it crashes !

  Should I use try {} catch (...) block in source file, if yes, then where should I use this ?
  I referred this link but did not find the right answer.

• nginx-rtmp module with ffmpeg

  1er janvier 2017, par sara

  I am new in video live streaming.I searched and found nginx-rtmp module to create a my media server,
  when i saw that ,
  i understood that we can run ffmpeg command in ngnix to transcode my video , or create a hls-variants , and this commands apply on videos on the fly . am i true ?
  
  if it is true , so with large video it takes a long time to tarnscode on the fly .so i wanna to execute my ffmpeg command when i sotre my video in my hls file path. so i create a hls files(.ts) first with running ffmpeg commands.and then i serve my files with ngnix-rtmp module.
  
  now my question is this 2 approaches(run async and sync(on the fly) ffmpeg command ) are true ?
  i saw a lot of example that implement first approach.and i interested in using second approach .second approach is not a common approach ?why ?is this approach has a problem and issue that i am not aware of that ?
  tnx