Video Wall Setup

What is Video Wall Mode?

Video Wall mode takes a single video and splits it across multiple monitors, creating one large seamless display. Unlike Standard Mode where each monitor plays a separate video, Video Wall mode displays portions of one video across your entire monitor array.

Key Benefits

• Single decode - One video file, one decode process
• CPU efficient - 50-75% less CPU than multiple separate videos
• Perfect sync - No synchronization issues since it’s one playback
• Seamless spanning - Video flows naturally across monitor boundaries

How Video Wall Works

The Splitting Process

When you configure a video wall:

1. MultiMon calculates the total resolution of your monitor grid
2. Your video is scaled to fill this total area
3. Each monitor receives its crop region (portion of the video)
4. A single window spans all monitors

Crop Region Calculation

For a grid of monitors, each cell shows a portion:

cellWidth = sourceWidth / columns
cellHeight = sourceHeight / rows

For cell at position (row, col):
  cropX = col × cellWidth
  cropY = row × cellHeight

Example: 4K video (3840×2160) on a 2×2 grid:

• Each monitor shows 1920×1080
• Top-left: pixels 0,0 to 1920,1080
• Top-right: pixels 1920,0 to 3840,1080
• Bottom-left: pixels 0,1080 to 1920,2160
• Bottom-right: pixels 1920,1080 to 3840,2160

Setting Up a Video Wall

Step 1: Open Video Wall Setup

Access the Video Wall configuration dialog from the main menu.

Step 2: Select Source Video

Choose the video file to display across your monitors. For best results:

• Match video resolution to total wall resolution
• Use HAP format for smoothest playback
• Ensure video aspect ratio matches your monitor layout

Step 3: Configure Grid Dimensions

Set up your monitor arrangement:

Setting	Description	Example
Columns	Horizontal monitor count	2 for side-by-side
Rows	Vertical monitor count	2 for 2×2 grid

Common configurations:

• 2×1 - Two monitors side by side (ultrawide effect)
• 1×2 - Two monitors stacked (portrait wall)
• 2×2 - Four monitors in square grid
• 3×2 - Six monitors (3 wide, 2 tall)

Step 4: Map Grid Cells to Monitors

Assign each grid position to a physical monitor:

1. Click a grid cell in the preview
2. Select the corresponding physical monitor
3. Repeat for all cells

Tip: Grid positions use row,col notation starting from 0:

• 0,0 = Top-left
• 0,1 = Top-right (first row, second column)
• 1,0 = Bottom-left (second row, first column)

Step 5: Preview and Apply

1. Review the mapping in the preview pane
2. Verify monitor assignments match your physical layout
3. Click Apply to save the configuration

Audio Behavior

Video Wall mode handles audio specially to prevent duplicate sound:

Monitor	Volume	Why
First assigned	100%	Primary audio output
All others	0% (muted)	Prevents echo/duplicate

If you need audio from a different monitor or multiple outputs, use Audio Routing.

Launching Video Wall

Enter Perform Mode

Once configured, launch your video wall:

1. Press F11 to enter Perform Mode
2. A single window spans all configured monitors
3. Playback starts automatically
4. Press Escape to exit

Keyboard Shortcuts

Key	Action
F11	Enter Video Wall / Perform Mode
Escape	Exit to main window
Space	Pause/Resume during playback

Resolution Matching

Ideal Setup

For the sharpest image, match your video resolution to your total wall resolution:

Wall Config	Monitors	Ideal Video Resolution
2×1 (1080p monitors)	2	3840×1080
2×2 (1080p monitors)	4	3840×2160 (4K)
3×2 (1080p monitors)	6	5760×2160
2×2 (4K monitors)	4	7680×4320 (8K)

Scaling Behavior

When video resolution doesn’t match:

• Smaller video - Scaled up (may lose sharpness)
• Larger video - Scaled down (no quality loss)
• Different aspect ratio - Letterboxed or cropped (configurable)

Tips for Best Results

Content Creation

1. Design for bezels - Account for monitor frame gaps in your content
2. Test alignment - Use a grid pattern video first
3. Avoid small text - Text crossing bezels is hard to read
4. High resolution source - Higher than your wall resolution if possible

Physical Setup

1. Align monitors precisely - Small misalignments are very visible
2. Match monitor models - Same brightness and color for consistency
3. Configure in Windows - Arrange displays correctly in Display Settings
4. Thin bezels preferred - Consider video wall-specific monitors

Performance

1. Use HAP format - Best performance for video walls
2. SSD storage - Required for 4K+ content
3. GPU memory - Ensure sufficient VRAM for your resolution
4. Test before events - Verify smooth playback at full resolution

Troubleshooting

Content Not Aligned

• Check Windows Display Settings arrangement
• Verify grid-to-monitor mapping is correct
• Ensure all monitors have same resolution setting

Gaps or Overlaps

• Reconfigure monitor positions in Windows
• Check for fractional scaling (should be 100%)
• Verify monitor bezels are accounted for

Stuttering Playback

• Convert video to HAP format
• Move content to SSD
• Close other applications
• Reduce resolution if hardware limited

Wrong Monitor Gets Audio

• First mapped monitor receives audio by default
• Use Audio Routing dialog for custom output
• Check Windows default audio device

Advanced: Bezel Compensation

For professional installations, some content creators design with bezel gaps:

1. Measure bezels - Total gap between display areas
2. Add to content - Create video wider by bezel gap amount
3. Position content - Account for “hidden” pixels behind bezels

This creates the illusion of continuous content despite physical gaps.

Next Steps

• Configure Audio Routing for custom audio output
• Learn about HAP Codec for optimal video wall performance
• Adjust Settings for hardware acceleration and display options