0

The camera model is a Sony, remote control model, I don't have the exact model# with me but can get it if needed.

I'm not sure when it started, but it's very noticeable now, the lines scrolling up the flag in this video: https://drive.google.com/file/d/0Bw1rEMBACTmYU2huY21IU3dFWFE/view?usp=drivesdk

Can anyone tell me what is causing this, is the camera going bad, or do the settings just require adjistment?

Update

Model: Sony BRC-Z330 (Purchased in 2010)

Settings:

Exposure Mode: Full Auto

Iris Limit: F11

AE Speed: MID

AGC Limit: 18dB

Ex Comp: Off

White Balance: Indoor

  • The camera model would be helpful, or at least the type of camera and what format you are using. What have you tried to correct the problem? Does it happen on any white object? Is the iris set to auto? What happens if you set it to manual and close iris down? – Michael Liebman Dec 4 '16 at 16:37
  • Is this also present in the source video being shown on the LCD screen ? If so, make sure it's the camera - try viewing the video on a different display. It's normal to sometimes get artifacts like this when filming computer / TV screens - it's due to the way the screens refresh. – JonasCz Dec 4 '16 at 16:40
  • I'll get that info soon @MichaelLiebman. Yes it's present in the source, the lines are being shown on every display. – MDMoore313 Dec 4 '16 at 16:44
  • @MichaelLibeman I only operate the cameras, I didn't set them up, so I haven't tried anything other than changing some settings, but my technical skills (and I do have technical skills) are in a different area, so I don't know where to start. I can make any changes suggested, but I'm not familiar enough with cameras to make any educated guesses. – MDMoore313 Dec 4 '16 at 16:47
  • @MichaelLibeman added model and settings information, and yeah it happens on any white object. – MDMoore313 Dec 4 '16 at 17:18
5
+50

You seem to have a flickering light source that is out of sync with the camera's rolling shutter.

Traditional lights

You should first verify that you are filming in 60/30/24 fps in regions whose power grid uses a 60 Hz frequency, or in 25/50 fps for 50 Hz. If that is impossible to achieve, you can also adapt your shutter speed or angle to be a multiple of the utility frequency. Red provides a nice calculator for this.

LED lights

Flickering can be particularly bad if you use low quality LEDs because their flicker index (or depth of modulation) can be worse than conventional light sources.

They might also flicker independently of the utility frequency. This is especially true for RGB lights or when dimming.

If you can, choose good quality high frequency switching or flicker free LED drivers, or ones that are made for video. You shouldn't have any flicker problems with good LEDs. You can also try to disable dimming or setting the highest power output to reduce flicker.

  • Okay, that makes sense. We've had the same lights in the sanctuary, would these count as flickering lights? drive.google.com/file/d/0Bw1rEMBACTmYZGFWVkFMczhrS0U/… – MDMoore313 Jan 1 '17 at 3:29
  • Those bulbs could be LEDs or halogens or even plain old incandescents. – Duvrai Jan 1 '17 at 20:18
  • @BigHomie pay particular attention to what Duvrai said wrt changing the shutter speed/angle. Just try a bunch of different variants to see what works. Naturally this means you won't get the 180degree shutter but without making any changes to lighting it should help. – Alex Jan 5 '17 at 4:12

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.