My NES shows audio but no video when hooked up to a computer

So recently I got this piece of hardware called the DVD maker usb 2.0; it came with composite cable connectors so I hooked up my NES and old CRT TV through audio and video spliters but when I went to record or even capture footage, it got the sound no problem but the video signal isn't showing up no matter what I do.....Is there a way to fix this or is there a capture program or piece of hardware I need????
 
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