Video Difference Marker

Compare two video versions and add Resolve markers where visual changes occur.

Select reference and updated clips, run a two-stage visual comparison, and turn detected differences into markers for a focused human QC pass.

What it does for you

Stack two versions of a cut and get a marker on every visual change.
Finds swapped shots, regrades, added text and logos; identical stretches get no marker.
Two-pass scan: a fast pass finds changed ranges, a frame-accurate pass places the markers.
Runs FFmpeg in the background with a progress bar and a Cancel button.

DaVinci Resolve Studio 19.1 or newer (the free version of Resolve blocks script windows).
Windows 10/11 and macOS 12+ (Apple Silicon and Intel). One file works on both.
FFmpeg (Windows: winget install Gyan.FFmpeg, macOS: brew install ffmpeg).
Install: copy the .lua file into Resolve's Scripts/Utility folder, then open it from Workspace > Scripts.
Tested on Windows 11 with Resolve Studio 21.1 and on macOS 15 (script code paths). Email support if anything breaks.

Browse the interface and open any image for a closer look.

Open the timeline used for review.

Select the old/reference clip and the new/updated clip in the browser.

If matching clips are stacked and have equal length, the tool can identify the lower track as Old and the upper track as New.