While I'm not disagreeing that using a PC may work quite well, I don't think there is any doubt any of the filters the OP is asking about would work to remove CP. Now maybe if your talking about a cheap "VHS" type of filter it probably won't work for the OP, but a quality DVD type filter should work just fine for a line input DVDR, I use a Grex and also older Sima and both allow me to record anything I've tried. The Sima lightens blacks quite a bit and I'm not to fond of that and the Grex loses a tiny amount of resolution but doesn't really effect the black level so I mainly use the Grex.....I would pursue that before spending any money on filters that may or may not even work.
Yes along with the S-video cable you need a red and white audio cable. I've used all types of S-video cables and they all preform equally well. I tend to prefer the thinner ones for ease of use, I have a few thicker ones I don't care for as much, mainly because they are stiff and bulky, not that they don't work as good as the others.
Personally the ones I like the best I've been getting at Menards(a local hardware type store, similar to Home Depot) which can be had for
YMMV and I only use 6 foot S-cables to my DVDRs. AFA your first question, no as I said before S-video is basically dead, only our old designed DVDRs have it and older DVRs, nothing new In fact my most recent TV, a nicer Samsung(all others are the same) couldn't even bother to include a dedicated composite video input it was shared with one of the inputs for component(which there was only one!) so by using component you had NO SD inputs whatsoever Again it made no difference the brand nor cost, all TVs were this way. Multiple HDMI inputs and one shared component/compositeHave you seen any television since 2014 that has S-Video input connectors? In my experience, if you use reasonable quality cables and restrict the length to what is actually needed rather than 9 or 12 ft standard lengths, the quality of composite is almost indistinguishable from S-Video. My television is a 55 inch HD.
The only time i've ever had an S-vid cable "go bad" is when one of the pins somehow got bent.In that case ya might as well toss it.If you use a pair of needle-nosed pliers you can *sort of* bend the pin to a somewhat normal position and try to re-seat it in the input,but the result is always poor.Better to toss it and grab another cheap cable.I've never had a S-video cable go bad but some people have and the symptom is B&W or an odd colored picture, sometimes if the cable isn't seated all the way I've seen this but just reseating has always fixed it for me.