AirParrot in Windows and AppleTV

I installed AirParrot in my Windows laptop. Then I played a video file and mirrored the screen to my AppleTV. Unfortunately I experienced a slow choppy video with no sound.

I thought it might be a problem of the home wi-fi. However when I run a YouTube app. in my iPad and mirror the iPad screen to the AppleTV everything is Ok. So, I think now that the wi-fi is not the problem.

Does it make sense ? What should I check ? How can I watch a video played in Windows in AppleTV ?