Strange Video Artifact with GH4: horizontal bands for second or two

B

Brian Siano

New member
I did a shoot about two months ago, and during the editing, I've found a few moments where a really awful video artifact's turned up. Best way I can describe it is that, for a second or two, the screen has these horizontal light and dark "bands" that travel up the screen.

I was using V-log, shooting at 29.97 fps, probably with a manual Rokinon or SLR Magic lens. The shots were indoors, but the only light was the sunlight through the windows, so this wasn't due to lighting flicker.

Has anyone else encountered anything like this? Is it an official "glitch" that might be fixed in a future firmware upgrade? Is it due to V-log?
 
Brian Siano said:
I did a shoot about two months ago, and during the editing, I've found a few moments where a really awful video artifact's turned up. Best way I can describe it is that, for a second or two, the screen has these horizontal light and dark "bands" that travel up the screen.

I was using V-log, shooting at 29.97 fps, probably with a manual Rokinon or SLR Magic lens. The shots were indoors, but the only light was the sunlight through the windows, so this wasn't due to lighting flicker.

Has anyone else encountered anything like this? Is it an official "glitch" that might be fixed in a future firmware upgrade? Is it due to V-log?
Click to expand...

I've seen this once. Don't think it was lighting flicker either because my source was incandescent and it wasn't reproducible. Perhaps something plugged into the camera is causing electrical interference? It reminded me of the type of artifact you'd get with an analogue tv set when you turned on a hair dryer or something.
 
That sounds like what I got. Only electronic interference may have come from the Tascam sound recorder or the two shotgun mikes that might've been standing nearby. Thing is, this happens only for a second or two, and the Tascam's made to be mounted right under the camera.
 
I have had the same issue. It is increasing in frequency now. It's doing it across multiple SD cards, so I've ruled them out. It looks to me like dust on the record head in the old analog tape days. Any idea how to correct this?
 
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