Help video quality questions

[Buildem336]

I took some video on my Atrix in HD and it looked great on the phone, it looked awesome when I hooked it up to my plasma thru hdmi. Now when I pulled the video to my computer and put it on you tube with pinnacle studio which I use with my HD camcorder and its works awesome there but not with the phone video. It looks horrible. Any Ideas.

Thanks

Manuel