1 month old computer i put a G4 mx460 video card in it great for games look so cool ,but video in looks good on the computer. look bad in capture .bad video resolution using WinProducer WinCoder . Demo iuVCR is great but will not let me capture. video . S video camcorder, Amd 1700(1.4)

Is the bad video resolution because?
Software
Svideo camcorder
or me
I want to capture better video resolution
Thank you
Gary