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• How to convert live video stream to mp4 format stream using FFmpeg API [on hold]

  27 avril 2017, par krish

  Using FFmpeg API :ConvertLiveMediaTask

  ConvertLiveMedia(Stream inputStream, string inputFormat, Stream outputStream, string outputFormat, ConvertSettings settings) ;

  Requirement : want to convert video file from any format to mp4 format and conversion should happen on fly using ConvertLiveMedia API

  Please help me for this problem, I googled so many times i didnt get a solution for this.

  Here is my code

  const int megabyte = 1024 * 1024;
  
  
  
   static string theFilename = @"F:\BackUp\Short video clip-nature.avi";
  
  
  
   static string[] VideoExtension = { ".ac3", ".aiff", ".alaw", ".asf", ".ast", ".mp4", ".au", ".avi", ".caf"};
  
  
  
   static void Main(string[] args)
  
   {
  
       ChunkedData(theFilename, 0);
  
   }               
  
  
  
   private static void ChunkedData(string theFilename, long whereToStartReading = 0)
  
   {
  
        string extension = System.IO.Path.GetExtension(theFilename);
  
  
  
        Stream chunkStream = new MemoryStream();
  
  
  
        if (VideoExtension.Any(Vi => extension.Contains(Vi)))
  
        {
  
             FileStream fileStram = new FileStream(theFilename, FileMode.Open, FileAccess.Read);
  
  
  
             using (fileStram)
  
             {
  
                   byte[] buffer = new byte[megabyte];
  
  
  
                   fileStram.Seek(whereToStartReading, SeekOrigin.Begin);
  
  
  
                   int bytesRead = fileStram.Read(buffer, 0, megabyte);
  
  
  
                   while (bytesRead > 0)
  
                   {
  
                       // Here i receive and implement
  
                       chunkStream = StreamData(buffer, bytesRead, extension);
  
  
  
                       bytesRead = fileStram.Read(buffer, 0, megabyte);
  
                   }
  
            }
  
        }                          
  
   }               
  
  
  
   private static Stream StreamData(byte[] buffer, int bytesRead, string formate)
  
   {
  
      // Have no idea what to give for ConvertSettings, i simply pass a object
  
      ConvertSettings settings = new ConvertSettings();
  
  
  
      var ffmpeg = new FFMpegConverter();
  
  
  
      Stream inputStream = new MemoryStream(buffer);
  
  
  
      Stream outputStream = new MemoryStream();
  
  
  
      try
  
      {
  
         // Here im getting outputStream capacity = 0, length = 0, position =0.
  
         var task = ffmpeg.ConvertLiveMedia(inputStream, formate, outputStream, Format.mp4, settings );
  
         task.Start();
  
  
  
      }
  
      catch (Exception ex)
  
      {
  
            Console.WriteLine(ex.ToString());
  
      }
  
  
  
      return outputStream; 
  
  }

• OpenCV won't open some videos of many videos of the same format

  2 octobre 2013, par OpenMinded

  I am using Visual Studio 2012 with OpenCV 2.4.6.

  I have 4 videos that I recorded one by one with my Nokia Lumia 920. OpenCV won't open .mp4 format from my phone by the default. So I converted all these 4 videos using Sony Vegas to .mp4 with the SAME preferences for all of them. Now the problem is that OpenCV has a problem to open two of them. The other two works like a charm with no problem. Below is the information about codec that I used (Yes, it is the same for all videos) :

  

  And this is the error :

  

  Why is it so that they are the same type but only a few of them are loaded properly ?

• Determine if video stream is a live stream

  17 mai 2018, par David

  Is there a way to use ffprobe or ffmpeg to determine if a given stream (for instance http://server/stream or rtmp://server/stream...) is an on-going live stream or is fixed stream (i.e. recorded in the path with no live updates) ?