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The original was posted on /r/datahoarder by /u/88slides on 2023-09-26 14:16:31+00:00.
I've been digitizing some family tapes and recently noticed some distracting noise in the form of diagonal lines across the sky in landscape shots.
The noise turned out to be from a mismatched ground - my camera was getting power from a USB adapter plugged into my computer, but my upscaler was referencing ground from another outlet. Plugging the camera into a USB wall wart on the same outlet solved the trouble.
I did some searching around for what might be causing that kind of noise but ended up having some trouble, so I figured I'd make a demo of what it looked like and what solved it.
For anyone curious, the setup I'm using:
Sony CCD-TRV815 -> S-video -> generic Amazon USB capture card. It's certainly not a proper master backup, but I don't have a TBC or know much about deinterlacing so it seems fine enough.