Smooth implication on video with a new command

[triplebit]

I use LibVlc dll and indirectly all the plugins in my C# application similar to the following(the actual command is different but the idea is the same) -
vlc screen:// :screen-fps=30 :screen-caching=100 --sout '#transcode{vcodec=mp4v,vb=4096,acodec=mpga,ab=256,scale=1,width=1280,height=800}:rtp{dst=192.168.1.2,port=1234,access=udp,mux=ts}
I would like to modify the code (probably with a new command) causing a smooth implication on the video and audio being playbacked - So far I could only launch a new command which would darken the screen until the new display raises up.
Is there any way to accomplish that?
Regards
Lקדיקר