@ elshorbagy

There are basically two options available:
1. From your graphics card (if so equipped)
2. From an I/O expansion card or device

This is directly from the help page on www.vmixhd.com:

Output:
Output 4 formats simultaneously (Screen, File, External Renderer, Streaming)
Default output to secondary computer display or projector
Optional output to compatible rendering device such as the Blackmagic Design Intensity Pro
Output to streaming applications such as the Adobe Flash Media Live Encoder
Output to web sites such as USTREAM and YouTube Live



Probably not much help, but the bottom line is how is you computer equipped?
Do you have HDMI out capabilities?



Ice