Play a Video on a Segmented LED Screen
LED walls are often driven by multiple processors, each receiving a portion of the total image. Backstage uses custom splits to divide a single Display into named rectangular regions — one per segment — and route each region independently to its processor or output.
Before you start
- You know the pixel dimensions of your full LED wall (e.g. 3840x2160)
- You know the pixel boundaries of each segment within that canvas
- You have the Outputs window open alongside the Scene
Steps
1. Create a Display
Click the + icon in the Scene Objects window and select Display → Flat.
2. Assign your video content
Drag your video asset onto the Display and confirm the Create Sequence? dialog.
3. Enable custom splits
Select the Display. In the Inspector, find Split & Rasterization:
-
Check Split to enable splitting.
-
Change the type dropdown from Matrix to Custom.
4. Add a split for each segment
Click + to add a split. Each split has three fields:
|
Field |
What to enter |
|---|---|
|
Name |
A label for this segment (e.g. "Top Left") |
|
Top Left |
Pixel coordinates of the segment's top-left corner (x, y) |
|
Offset |
Width and height of the segment in pixels |
Example for a 3840x2160 wall split into four equal quadrants:
|
Segment |
Top Left |
Offset |
|---|---|---|
|
Top Left |
0, 0 |
1920, 1080 |
|
Top Right |
1920, 0 |
1920, 1080 |
|
Bottom Left |
0, 1080 |
1920, 1080 |
|
Bottom Right |
1920, 1080 |
1920, 1080 |
5. Split the Output
Each custom split becomes a named display slot. In the Outputs window, select the GPU output connected to your LED wall. Navigate to Split and configure output splits to match your LED processor. Link your Display segments to the Output segments.
6. Verify the setup
Play the sequencer and check each physical output. If a segment shows the wrong region, check the Top Left and Offset values.
Common Mistakes
-
A segment shows the wrong region — the Top Left or Offset values are incorrect. Verify pixel coordinates against your LED wall's physical layout.
-
No named display slots in the Outputs window — Split is enabled but the type is still Matrix. Change to Custom.
-
Removing a split breaks output routing — when a split is deleted the output loses its assignment. Re-assign in the Outputs window.
Tips
-
Coordinates are in pixels relative to the Display's texture resolution — ensure it matches your full wall size.
-
Segments can overlap if needed (unusual, but supported).
-
Custom splits slice the same video canvas. For different content per segment, create a separate Display per segment.
Related
Play 1 Video on Multiple Displays — play one video on multiple displays
Installation Scenarios — all installation scenarios