Flashing Green Pixel on Footage

O

Oedipax

Well-known member
Has anyone else encountered this? I did some shooting today on a bright white backdrop and when you see it in the footage, up in the top left corner of the screen, there's a green pixel flickering on and off. Weirdly, it goes away when I pan down to something a bit darker, although sometimes it comes back. You can't see it at all on the LCD because it's right at the edge of the underscan region. This is on a DVX100A, if that makes a difference. On a few other shots, it's actually the top line of the whole image that's flickering green.

I'll run my cleaning tape through the DVX tonight and see if that clears it up. Was just wondering if it might be something else, though (I hope not, but I suspect it might be). The footage otherwise is fine, and I can either crop that one pixel or zoom in by 1 pixel on all 4 sides (this video is for the web so it'll definitely show up if I leave it in).

Here's a grab showing the pixel (pardon my crappy red arrow):

greenstilluo4.jpg
 
Sorry, I've never noticed that. I couldn't help but notice this beautiful picture, man.

What were your settings? Adapter?

Nice, clean crisp shot you got here dude.

Sorry I'm no help for this. My guess would be the editor your using. Not sure though.

Robbie
 
Yeah, I thought it might be the editor too, although I've never seen that happen with it before (Final Cut Pro), but the same thing shows up when I just play the files in Quicktime.

Thanks for the comment on the grab though, it's using my beloved SGpro rev3. Scene-file wise I had everything pretty much zeroed out except detail +4 and pedestal -5 or so (I had it on -6 for a while and needed just a little more shadow detail, but I don't remember if it was before or after this shot). Normal gamma and matrix. Only problem is that shadow on the left side of the screen (where the backdrop ended) didn't show up on my LCD (overscan, grr) so I'll have to mess with that in post.
 
What was the light source? If flou lights (like household type) it may be flicker from that if you didn't have your shutter speed matched up with the hz of the lights.

The other thing it could be... you used an adapter. Look at the footage in FCP before you flip it and see if that is still there. Some NLE's (don't know if Final cut does this or not) will create a weird effect across the top of the frame when you flip/flop footage. My EDIUS creates like a mirror effect of the bottom of the frame. It's very thin... one thin line. I've heard Premiere does it as well. So, it could just be as simple as that.

Those are my first two guesses anyways.

later,
Jason
 
Lots of lights. This is at a studio that normally does tons of still photography for catalogs, and they have a pretty awesome assortment of Arri lights. We did so many setups today that I don't remember what the rundown was on this particular shot. If I had to guess there were probably 4 or 5 lights for this one, a couple directly on the ottoman, a couple more bouncing some fill light off white cards and one more just to bring up the background.
 
Jason,

I think you're right - when I look at the footage in Quicktime without flipping it, the line's gone. Funny that even rotating it in Quicktime will do it, as well as FCP. Presumably this goes away once you render.

Phew, that's a big relief! I guess I'd just never noticed this before since I don't usually shoot on such a clean background.
 
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