Export Issue: Track 2 (Webcam) and Track 1 (Gameplay) Flashing Over Each Other in Final Render Only

[RickJoueQc]

Hi everyone,

I’m experiencing a strange issue during export in DaVinci Resolve 20.

The Problem:
After completing my edit, everything plays perfectly in all preview pages — Edit, Color, and Deliver — with no glitches or visual issues. However, once the export is complete and I open the final rendered file, I notice brief flashes of Track 2 (webcam) randomly appearing over Track 1 (gameplay), and sometimes vice versa, at seemingly random points in the video.

Track 2 contains a cropped and scaled webcam feed (positioned in the bottom-left corner).

Track 1 contains full-screen gameplay footage.

Both tracks have independent color grading applied in the Color page.

There are no effects or transitions applied at the affected moments.

This behavior does not occur during timeline playback — it’s only visible in the exported file.

️ Project Info:
Source files: 1920x1080 @ 60fps, recorded in OBS (MKV format)

Timeline: 1920x1080 @ 60fps

Export: 3840x2160 @ 60fps (upscaling for better YouTube encoding), QuickTime H.265 (also tested MP4)

Encoder: Auto (likely GPU hardware), also tested Native

GPU: AMD Radeon RX 7900 XT (latest driver)

CPU: AMD Ryzen

OS: Windows 11

Render Settings:
"Bypass re-encode when possible" was enabled (currently disabled for testing)

"Frame reordering" enabled

Quality: Best

Encoding Profile: Main

No Fusion compositions involved

Webcam track has keyframes for position and scale

Color grading is applied separately to both the gameplay and webcam clips

What I’ve Tried:
Deleting all render cache (Playback > Delete Render Cache > All)

Disabling "Bypass re-encode when possible"

Exporting with both H.264 and H.265

Switching encoder from Auto to Native

Creating compound clips for both webcam and gameplay tracks

Disabling "Frame reordering"

I’ll include a short example clip that clearly demonstrates the issue.

Any help or suggestions would be greatly appreciated — I'm trying to figure out if this is a bug, a GPU-related rendering issue, or something I can resolve through workflow adjustments.

Example Clip: [attached] — The following timestamps show the flickering glitch clearly:
00:01:05 – Track 2 (webcam) flashes over Track 1 (gameplay)
00:05:40 – Track 1 (gameplay) briefly covers Track 2 (webcam) in the bottom-left corner

Thanks in advance!

 

[oldschool47]

That's really odd. So when overlapped, video clips on higher tracks will always play in preference to lower ones, but the opposite shouldn't happen. It sounds like they aren't, but make sure that none of the clips are disabled.

Is it the same frames that it's happening on every time or is it random?

Try exporting using these settings: Custom Export, Format: MP4, Codec: H.265, then under Quality select Restrict to and set it to around double your framerate x1000. I.E. if your framerate is 30fps set it to 60,000.

 

[RickJoueQc]

Hi, thanks for the help.

None of the clips are disabled. I haven't tried exporting it a second time to see if it's exactly at the same place. I will try in my next edit, it will probably happen again.

I will try with the export settings you suggested too!

Thanks!

 

[oldschool47]

I would definitely try exporting it a few times to see if/where it keeps happening