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• 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.

• Getting ffprobe or avprobe not found while using youtube_dl module

  26 décembre 2016, par Avinash

  import youtube_dl
  
  
  
  
  
  options = {
  
      'format':'bestaudio/best',
  
      'extractaudio':True,
  
      'audioformat': 'mp3',
  
      'outtmpl':'%(id)s.%(ext)s',
  
      'noplaylist':True,
  
      'nocheckcertificate':True,
  
      'postprocessors': [{
  
          'key': 'FFmpegExtractAudio',
  
          'preferredcodec': 'mp3',
  
          'preferredquality': '192',
  
      }],
  
  
  
  }
  
  
  
  with youtube_dl.YoutubeDL(options) as ydl:
  
      ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])

  I am Getting

  "youtube_dl.utils.DownloadError : ERROR : ffprobe or avprobe not found.
  Please install one."

  I downloaded ffmpeg and tried giving its bin folder location in path variable . I also tried copying that bin folder to my youtube_dl package folder. None of them worked.

  Thanks in advance.

• 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