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• how to do mjpeg streaming using ffmpeg and c#

  19 décembre 2017, par Mahesh Vemuri

  I am trying to create a preview of my rtmp stream. But RTMP playback occupies the bandwidth as source, I want to do mjpeg streaming using ffmpeg and c#. Is it possible to do ?

  I am trying to create a webpage where users can monitor the stream. For this I dont need to use RTMP url to watch as it needs more and more bandwidth.

  So, my idea is to capture images and show them in sequence rate controlled at 1 frame per second. In this way users can monitor.

  I have tried various methods like using mjpeg

  ffmpeg.exe -i renditiontest.mp4 -c:v mjpeg -q:v 31 -an sample.avi

  Now, output file is getting generated. But, it is occupying harddisk.

  So, next way is to create images overwriting previous images

  ffmpeg.exe -y -i renditiontest.mp4 -f image2 -updatefirst 1 sample2.jpg

  Now, I tried creating a stream which will continously read the image and write it as response in C#.

  using (WebClient webClient = new WebClient())
  
                  {
  
                      string url = "http://localhost/probe_VOD/mjpg/sample2.jpg";
  
                      var memoryStream = new MemoryStream(webClient.DownloadData(url));
  
  
  
                      response.Headers.AcceptRanges.Add("bytes");
  
                      response.StatusCode = HttpStatusCode.OK;
  
                      response.Content = new StreamContent(memoryStream);
  
                      //response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("render");
  
                      //response.Content.Headers.ContentDisposition.FileName = "sample.jpg";
  
                      response.Content.Headers.ContentType = new MediaTypeHeaderValue("multipart/x-mixed-replace; boundary=myboundary");
  
                      response.Content.Headers.ContentLength = memoryStream.Length;
  
                  }
  
                  return response; 

  Please let me know how do I acheive this.

• Increasing speed of a video in C# ?

  13 décembre 2017, par alan samuel

  I am trying to increase the speed of a video using NReco.VideoConverter.FFMpegConverter

  Here is what I have tried.

    var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
  
    string inputfile = @"C:\Users\Alan\Desktop\Video.flv";
  
    string outputfile = @"C:\Users\Alan\Desktop\converted.mp4";
  
  
  
  
  
    ConvertSettings convertSettings = new ConvertSettings
  
          {
  
              MaxDuration = 10,
  
              VideoFrameRate = 12
  
              //VideoFrameCount = 10
  
  
  
          };
  
  
  
  ffMpeg.ConvertMedia(inputfile,Format.flv, outputfile,Format.mp4,convertSettings);

  What I want is like a video with an increased playback like in this example - https://www.youtube.com/watch?v=6tQ1ewhGiwk

  This is what I am basically trying to do.

• FFMPEG : tee pseudo-muxer to RTMP endpoint with authorization

  20 janvier 2019, par stevendesu

  I have an RTMP server which requires authorization to stream to. In FFMPEG, I can stream to it like so :

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f flv \
  
      "rtmp://server/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"

  Now I wish to split this stream out to two such endpoints without re-encoding

  I can get it working with re-encoding like so :

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f flv \
  
      "rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f flv \
  
      "rtmp://server2/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"

  However I tried taking a look at FFMPEG’s guide on this subject and it led to nothing but errors :

  Attempt 1

  Direct usage of -f tee

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f tee \
  
      -map 0:v \
  
      -map 0:a \
  
      "[f=flv]rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id| \
  
       [f=flv]rtmp://server2/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"

  Yields :

  [rtmp @ 0x3fe7f40] No credentials set
  
  [rtmp @ 0x3fe7f40] Server error: [ AccessManager.Reject ] : [ code=403 need auth ] :

  Attempt 2

  Using quotes around URL and parameters

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f tee \
  
      -map 0:v \
  
      -map 0:a \
  
      "[f=flv]\"rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id\"| \
  
       [f=flv]\"rtmp://server2/instance live=true pubUser=user pubPasswd=pass playpath=stream_id\""

  Yields :

  [tee @ 0x39837e0] Slave '[f=flv]"rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"': error opening: No such file or directory

  Attempt 3

  Quotes around everything

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f tee \
  
      -map 0:v \
  
      -map 0:a \
  
      "\"[f=flv]rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id\"| \
  
       \"[f=flv]rtmp://server2/instance live=true pubUser=user pubPasswd=pass playpath=stream_id\""

  Yields :

  [NULL @ 0x393a820] Unable to find a suitable output format for '"[f=flv]rtmp://server1/instance live=true pubUser=user pubPasswd=pass playpath=stream_id"'

  Attempt 4

  Alternate URL schema to avoid spaces

  ffmpeg \
  
      -i <input /> \
  
      -c:v libx264 \
  
      -c:a speex \
  
      -f tee \
  
      -map 0:v \
  
      -map 0:a \
  
      "[f=flv]rtmp://user:pass@server1/instance/stream_id| \
  
       [f=flv]rtmp://user:pass@server2/instance/stream_id"

  This seemed to work, but FFMPEG started outputting this :

  frame=   89 fps= 13 q=0.0 Lsize=N/A time=00:00:03.27 bitrate=N/A dup=18 drop=0 speed=0.469x

  Notice the bitrate=N/A and the speed=0.469x ? Both concerns. Then I go to the player to watch my stream and it’s solid black. No data is actually coming through.

  What am I doing wrong, and how do I get this stream working ?