Streaming video from DM5620 and DM500 is better, especially for higher bitrates, if the tv display is stopped. Neutrino images already had this facility. However to make it possible with enigma, I developed a small modification and a plugin. As people have asked me for this code I attached it below.
I don't know if it is the best way to stop tv display before streaming from the box, but it works. 
Regards, pcd.