when I connect with my usb Tv Tuner with video camera
& use dx Tuner resolution of screen is very bad although when I use Software of USB resolution is very good
DirectShow is a complex technology and you should consider document yourself and learn how it works.
This book is good (and have a couple of chapters on the analog capture that seem to be of prime interrest for you) :
Thoses links are also a good start :
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