HD Video Capturing Using TV Tuner Card In C#

Question

Hello Guys,

 

             Currently, I have c# windows application with video capturing from TV Tuner card usinf AForge. Right now I have to upgrade into Normal Video captring to HD Capturing.
I'm trying a lot. But I could not able to do that. the captured video doesn't acheieve the HD Calrity.

Please any one help me to solve or otherwise suggest me, shall i go with any Thirdy Party Tool.?

I need help.It is very Urgent. Thanks in Advance.