Banding issue

Former user wrote on 4/14/2022, 3:11 PM

@Greg-Warren Hi, does the banding show when played on all media players, & that isn't a cheap camera, is the banding on the orig footage when viewed on the camera? if you can see it on the screen that is.

Any chance of sharing a screenshot, using the arrow button next to the smiley button,

RogerS wrote on 4/14/2022, 4:08 PM

Were you shooting a screen? Were you shooting under fluorescent lights?

I own the a6600 and haven't yet seen banding on any clips.

Musicvid wrote on 4/14/2022, 4:32 PM

There is not "horizontal" banding. I goes in any direction or curve.

Post an example, along with this necessary information, please:

https://www.vegascreativesoftware.info/us/forum/faq-how-to-post-mediainfo-and-vegas-pro-file-properties--104561/

lan-mLMC wrote on 4/14/2022, 7:35 PM

Try BCC+DeBand

https://borisfx.com/documentation/continuum/bcc-deband/

Musicvid wrote on 4/14/2022, 9:40 PM

@Greg-Warren Thanks for sending me your original source clip.

The problem is fairly common:

Your camera frame rate is 29.970 fps, or 30*1000/1001
Your room LED lighting is 60hZ, which is not an even multiple, but an irrational number. This causes what is known as slow speed oscillation.
You will get much closer with a camera frame rate of 30.000 fps, which is an even factor of 60; but it may not be exact because camera clocks are no longer slaved to line frequency and can drift a little. Hardware to do this is fairly costly, and it is impossible to remove completely in post.
Let us know what you come up with; actual banding is a function of spatial bit depth, not frequency.
Here's an identical response from a dashcam; watch the red traffic lights fade in and out. The radio playing "Struttin' With Some Barbeque" is purely coincidental.

Selina wrote on 4/15/2022, 12:38 AM

I'm no expert...

But from what I can see, the banding moves up the frame at a fairly constant rate irrespective of camera movement. I don't know if there are any plug-ins out there that will do the trick?

I created a simple image overlay with white bands where the dark ones appear and overlaid it. It's not perfect, perhaps not even ideal ...

BEFORE

AFTER

Musicvid wrote on 4/15/2022, 6:26 AM

Any attempts to correct this in post will be a contrivance; Selina's mask seems better than anything I was able to come up with in 2009 when I had a show that was shot like this. With new tools, tracking the overlay mask to the motion of the dropout seems like it may be more doable than it was back then. Some motion tests would be interesting.