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• How to decode RTSP h264 stream from IP camera using C# and EMGUCV ?

  9 janvier 2020, par xor31four

  I am trying to access a H.264 stream on an IP camera within my LAN via EmguCV Video Capture. There is an RTSP URL containing the h.264 stream and an HTTP URL that transmits MJPEG.

  The goal is to perform perform some EmguCV video processing operations on a live stream in as close to real-time as possible.

  I have a bandwidth limitation of 10Mbps.

  The problem is that Emgu.CV is unable to open the rtsp(h264) stream but perfectly capable of opening the http(mjpeg) stream..

  I can’t use the mjpeg stream as it consumes too much bandwidth and I drastically lose picture quality and fps.

  I need to access the h.264 stream in order to meet my bandwidth requirements

  Here is the code that I use to check whether the capture has been created :

              string MJPEG_URL = "http://192.168.0.11:35271/image1"; //returns true
  
              string RTSP_URL = "rtsp://192.168.0.11/stream1.sdp"; //returns false
  
  
  
              _cam1 = new VideoCapture(RTSP_URL, VideoCapture.API.Any);
  
              var flag = _cam1.IsOpened;
  
              Console.WriteLine(flag);

  RTSP_URL returns false. But when I enter the exact same URL in VLC Player, or if I use VLCSharp library to access the stream it works.

  Any suggestions ?

• FFmpeg and h264_qsv

  16 juin 2015, par Dmitry Vasilyev

  I use Intel Quick Sync encoder inside FFmpeg for h264 RTSP streaming.

  find_hwaccel method from utilc.c is used for filling hwaccel structure.

  libx264 encoder is working with AV_PIX_FMT_RGB24 or AV_PIX_FMT_NV12 formats. But h264_qsv requires AV_PIX_FMT_QSV.

  Method vpicture_get_size(AV_PIX_FMT_NV12, width, height) returns correct size. But method vpicture_get_size(AV_PIX_FMT_QSV, width, height) returns -22
  In addition, method avcodec_encode_video2 crashes when context is filled with AV_PIX_FMT_QSV format.

  What is the reason of such behavior ?

• Raspberry Pi : Playing multiple video files in mkfifo pipe

  19 janvier 2017, par user3246167

  I have 2 files, test.mp4 and test2.mp4 that I want to play concurrently with no noticeable break in the middle. Currently I’m using

  mkfifo test
  
  cat test.mp4 > test &
  
  cat test2.mp4 > test &
  
  omxplayer test

  However, when I do this, omxplayer just returns data and doesn’t play the file. But if I just put a single file into the pipe, omxplayer shows it normally. I’ve also tried using the copy command in ffmpeg, and that also just returns data, doesn’t play the file.

  I understand that I can just concatenate the 2 files together, but that will not work for my purposes, because I will need to be able to feed files to the pipe while omxplayer is running