Modify an existing video overlay's source, start time, or styles. Shallow-merges styles_patch into overlay.styles.
How It Works
Use when user wants to change an existing video clip (swap source, adjust start time, change styles). Do NOT use add_overlay — this edits a video overlay already on the timeline. src: new video URL (only if replacing the clip). videoStartTime: offset in seconds where playback begins within the source. styles_patch: partial CSS style object (opacity, objectFit, filter, etc.).
Specifications
Category
Overlays
Execution
instant
Credit Cost
Free
Overlay Types
video
Tags
edit, video
Example Prompts
“swap this video clip”
“change the video start time”
“make the video semi-transparent”
“adjust video opacity”
Required Parameters
overlay_id (integer)
ID of the video overlay to modify
Optional Parameters
src (string)
New video source URL (only if replacing the clip)
content (string)
New display label
videoStartTime (number)
Offset in seconds where playback begins within the source clip
styles_patch (object)
Partial CSS styles to merge (opacity, objectFit, filter, etc.)
user_text (string)
undefined
Use Cases for Overlays
Add lower-thirds and name titles for YouTube interviews
Layer data visualizations over B-roll for corporate presentations
Place map overlays on travel vlogs to show locations
How to Get Started with Change Video Clip Properties
1.Open any project in the 6trim editor or create a new one.
2.Type a prompt in the AI assistant — for example: "swap this video clip".
3.The Change Video Clip Properties result appears as a video overlay on your timeline. Drag to reposition or resize.
Frequently Asked Questions
Try Change Video Clip Properties Free
Type a prompt or use the toolbar. No download required.