So i’ve captured off my CRTs for years, but lately i’m getting this line across that slowly scrolls up. It’s definitely got something to do with the shutter speed / refresh rate but it happens on all my CRTS and all my cameras (iphone, 5D, DXC3000). Has anyone else come across this? I shoot at 1/50 shutter speed at 25fps, and playback at 25fps. I’ll pull up a screenshot of it when I get a sec.
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NTSC or PAL?
if PAL, then you’re shooting at the correct shutter speed; for NTSC you would want 1/60.
the scrolling line is due to the sync being almost perfect but not quite (if it was not almost perfect, you would have the black bar that looks even worse).
in my experience it’s somewhat unavoidable with consumer equipment. if you had access to industry-grade equipment, the solution would be to use a camera with sync/genlock input, and sync the camera with the video signal. then you would have actually-perfect sync (instead of almost perfect)
PAL.
Yeah, it’s infuriating as i’ve captured for years and only just noticed it. Or it’s shown up but never been this consistant. I’d blame it on 29.97 vs 30fps but both playback and capture are 25fps.
I’m using a Sony DXC 3000 for the capture which has a genlock in, but sending the clip from my pc via a Blackmagic Intensity Shuttle to a Panasonic MX70 into a Sony PVM 14 and 21. Not sure if I can genlock the Intensity or the Panasonic. I’ll look into it.
you can take one of the extra outputs of the mx70 (or one of the pass-throughs of the PVMs) and plug it into the genlock input of the sony DXC 3000. that should sync the camera to your video signal, see if that fixes it. how are you capturing the analog signal from the sony DXC by the way?
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Thank you! I’ll try it out
I’m capturing from the dxc3000 into a intensity 4K video card in my PC.