Wpf – MediaElement and RTSP

VLC also comes with an ActiveX plugin that can display the feed in a web page:

http://wiki.videolan.org/ActiveX/HTML

<OBJECT classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921"
     codebase="http://downloads.videolan.org/pub/videolan/vlc/latest/win32/axvlc.cab"
     width="640" height="480" id="vlc" events="True">
   <param name="Src" value="rtsp://cameraipaddress" />
   <param name="ShowDisplay" value="True" />
   <param name="AutoLoop" value="False" />
   <param name="AutoPlay" value="True" />
   <embed id="vlcEmb"  type="application/x-google-vlc-plugin" version="VideoLAN.VLCPlugin.2" autoplay="yes" loop="no" width="640" height="480"
     target="rtsp://cameraipaddress" ></embed>
</OBJECT>

Try Accord.Net (http://accord-framework.net/). It has a very simple interface and is available as a nuget package (Accord.Video.FFMPEG). It can be used to retrieve a Bitmap instance which can be used in WinForms/WPF. The downside is that it doesn't support Mono (not sure what platform you're targeting).

Example:

VideoFileReader reader = new VideoFileReader();
reader.Open("rtsp://192.168......");

while (true)
{
   Bitmap frame = reader.ReadVideoFrame();
   //Do whatever with the frame...
}

reader.Close();