There's 2 problems with using a DVD recorder
1) I you're trying to play Virtua Cop or House of the Dead.with the Stunner, it will not work by the very nature of CRT technology VS. LCD technology.
CRT shot out electrons in a dot-by dot fashion first it does (for the sake of example, not sure exactly o the exact order, just demonstrating a principle) the upper left dot, then scan across to the right, one dot at a time, then does the next line, dot by dot, and so forth until it its the last line, then repeats the process 30 times per second. When you pull the trigger, the camera can see, accurate to a millionth of a second (again, not sure of a per dot hertz rate, sake of example) when any light hits the gun, then the gun is connected to the internal clock on the Saturn, and on a formula, figures the frame stamp, and then within the frame, based on a fraction of a frame, the X and Y coordinates and determines where the bullet files to.
I'm not exactly sure how LD technology works, but the screen is usually computed one frame at a tie because compression algorithms don't give a dot-by-dot absolute reading, but relative to previous dots. TV's usually have built in processors to improve picture quality. and the Crystals are synched to act at he same time, and not in a pixel-by-pixel progression. The thing you avoid is scanlines, but scanlines are what makes light guns work. If you ever want to play Virtua Cop, DO NOT THROW OUT YOUR CRT TV.
2) Even if you have absolutely no light gun games if your collection, consider the following. Take a Wii, or something similar where a motion control moves a cursor. If plugged directly into a Component Input like the PS3DTV, the cursor should act normally. Now try plugging it in the composite or S-Video output into a DVD Reorder input. Look at the main screen where you are moving your hand. Notice a delayed reaction, like you are skating, If you're using a DVD recorder as an input converter, notice that even when not recording, the cursor skates late. It's hard to draw a circle without training yourself, let alone interact with items on the screen in a reasonable time. So even though it will convert it, it's not accurate in timing to the nearest 30th on a second, let alone accurate enough to keep the dot sync or the purposes o a light gun. A VCR doesn't have that problem because it doesn't either have to convert composite or S-Video into Component and/or convert into a burnable format on DVD.
The reason why S-Video to component is important is because a lot of good TVs had component, but no S-Video even in the early 2000's. I heard any good converter (A/V receiver, special converter) will convert S-Video to Component quick enough not to throw o a light gun. All it is is a straight run through of the black and white signal and splitting the color from 1 stream to 2 color components. Composite takes a single signal stream and first must split it into B/W and color, but a cheap, unpowered $5 adapter can do the job, and then split the color into 2 colors. And going down from S-Video to Composite then up to component renders the S-Video cables I paid good money for moot, like connecting 2 garden hoses to a Y adapter and having it come out one hose, the rate water leaves is cut in half, then i it's split into 3, each stream has 1/3 the low rate but the data is baked u at he first Y, and half the water lows out., whereas the S-Video just cuts the color in half of capacity per color stream, but the water flow is the same in terms of total water. Now replace water with Video Data. Instead o quantity of water it's quantity of data, and in terms of electronics, quantity is quality, all other things being equal.
If anyone knows of a cheap Composite/S-Video -> component converted WITH QUICK ENOUGH DELAY to let a light gun work on a CRT TV, let me know. Trust me I tried the DVD recorder, too much delay for a Wii, let alone a light gun game which must be accurate to the millionth of a second.