How to Fix Video Artifacts (Fuzzy, "Grounded", Flickering Video)
This guide helps you troubleshoot video artifacts such as:
- Fuzzy or blurry image
- “Grounded” or wavy video (rolling lines)
- Flickering or distorted footage
It applies to wired security systems only:
- DVR systems (cameras using BNC/coaxial cables)
- NVR systems (IP cameras using Ethernet cables)
Choose the type of recorder that you have:
Things to Prepare
- Ensure your DVR/NVR and cameras are powered on
- Confirm the camera feed appears on your monitor
- For connection setup, refer to:
Choose Your Issue
Fix Fuzzy or Blurry Camera Video
Check Camera Lens Condition
- Inspect the lens for dirt, dust, or moisture
- Clean using a microfiber cloth
Why this helps? A dirty or obstructed lens reduces image clarity regardless of cable type.
Verify Resolution Settings
NOTE: Changing video quality won't affect recording quality. If video artifacts are present in recordings, skip this step.
Follow the provided steps depending on where you are viewing the cameras. You don't need to do all of them.
On NVR's Display
Select a channel until the camera toolbar appear. Click the HD/SD icon to change its quality between Mainstream (HD) and Substream (SD)
On Swann Security app
Tap a channel to select and expand it. Look for the icon (swipe to the left to reveal more icons), tap to select, then change the Quality to a higher value or option.
By default, it is set to a lower quality as it prioritize streaming.
Why this helps? Low resolution or sub-stream viewing can make video appear pixelated or blurry.
Check Cable Quality and Connection
For DVR (BNC/coaxial):
- Inspect coaxial cable for looseness or wear
- Ensure BNC connectors are firmly locked
- Replace with a known working cable if needed
For NVR (Ethernet/IP cameras):
- Check Ethernet cable for damage or loose RJ45 connectors
- Try a different LAN port on the NVR or switch
- Replace cable if necessary
Why this helps? Signal degradation—whether analog (BNC) or digital (Ethernet)—impacts image clarity
Fix Flickering or Intermittent Video
Check Power Supply
For DVR cameras ONLY
- Ensure the camera is receiving stable power
- DVR cameras need at least 12V 0.5A on each camera; or 12V 2A for four cameras, paired with a 4-way splitter and the included camera cable in the DVR kit
- For more details about power rating, visit this article
- Try a different power adapter or power outlet
Why this helps? Unstable voltage can cause flickering or signal drop.
Check Cable Integrity
For DVR (BNC):
- Look for cuts, bends, or stretched coaxial cables
For NVR (Ethernet):
- Check for damaged Ethernet cables
- Ensure connectors are properly crimped and seated
Why this helps? Physical cable damage disrupts signal transmission.
Test Another Channel or Port
Connect the camera to a different DVR/NVR input
- If the issue follows the camera → Camera may be faulty
- If the issue stays on the same port → Recorder input may be faulty
Why this helps? Determines whether the issue is with the camera or recorder port.
Issue Affects One Camera Only
Swap Components
- Swap the affected camera with a working one
- Swap cables (BNC or Ethernet depending on system)
Why this helps? Quickly isolates whether the issue is the camera, cable, or recorder.
Check Recorder Port
- Plug a working camera into the suspected port
Why this helps? Confirms whether the DVR/NVR channel is faulty.
Check for Hardware Failure
If the issue remains with the same camera:
- The camera sensor or internal hardware may be failing
Why this helps? Persistent artifacts often indicate internal component failure.
Summary & Next Steps
Video artifacts on wired security systems are commonly caused by:
DVR Systems (BNC/Coaxial)
- Loose or damaged coaxial cables
- Ground loop interference (wavy lines)
- Faulty camera or DVR input
NVR Systems (Ethernet/IP)
- Damaged or loose Ethernet cables
- Faulty ports or network hardware
- Power instability
What You’ve Done
- Checked lens and resolution settings
- Verified cable connections (BNC or Ethernet)
- Tested power and recorder ports
- Isolated faulty components
Still Having Issues?
If the issue persists after all steps:
- Replace the camera or cable with a known working unit
- Test the system on a different port or recorder
- Contact Swann Technical Support for advanced diagnostics
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