Originally Posted by Joxer
s-video though 480i has higher bandwidth than composite video, also the color is separated for better quality.
Theoretically yes, but svideo shines when the luminance and chrominance are kept completely separate from the origin, such as from one svideo playback VCR to another, or from a camera's svideo out to a recorder's svideo in.
If the device with an svideo output simply has a couple of cheap bandpass and lowpass filters inside it to internally convert composite into svideo, then it's no better than using composite, and probably slightly worse.
Usually the digital signal in the receiver converts more or less first to HDMI/DVI, and then to YPrPb analog component (HD and SD flavors), and then from SD component it derives svideo and composite, sort of in that order.
Back on topic, my vote for this thread is for the OP to use something like the Hauppauge HD PVR adapter, which connects to his satellite DVR via component video connections (even has a loop in/out set of connections so you can leave it inline between the DVR and the TV) and record it in realtime in high def analog to a PC, and make a file. That's what I bought to replace my 8 year old Panasonic DVD recorder after a lot of consideration. Buy it soon before it gets really popular and the movie studios want to shut it down.