Quick answer
A VLC mosaic is an advanced VLM configuration, not a drag-and-drop collage. Each source feeds the mosaic bridge, a background defines the canvas, and one output chain displays or streams the composed grid.
Understand the task
Input
Two or more predictable video sources, a background image, and a local test destination.
VLC action
VLM channels bridge decoded video into a defined mosaic grid before the output is displayed or streamed.
Expected result
One composed canvas contains the selected sources in a stable order with deliberately chosen audio.
Tip: Prove two local tiles first; every added source multiplies the number of paths that can fail.
Steps to create a Video Mosaic in VLC
Decide whether the result should appear locally or be streamed. Prove local display first so network delivery is not mixed into layout diagnosis.
Prepare two short test clips and one background image. Use predictable dimensions and filenames before adding live cameras or remote streams.
Create one VLM broadcast channel per source. Send video through mosaic-bridge and handle audio separately through the bridge output.
Create the mosaic output with an explicit canvas width, height, row count, column count and source order. Keep aspect ratio enabled unless stretching is intentional.
Save the configuration as a .vlm file and launch it with VLC's vlm-conf option. Fix file paths and channel IDs before changing codecs.
Confirm every tile appears in local display. Add sources one at a time so a missing channel can be traced to one input.
Only after the local composite is stable, replace the display destination with a documented local-network output and test one receiver.
Choose a mosaic only when the output needs one canvas
| Goal | Better VLC route | Why |
|---|---|---|
| Watch feeds separately | Multiple VLC windows | No transcode or grid configuration is required |
| Display a live grid | VLM mosaic | Sources are composed into one output canvas |
| Edit clips and titles | Dedicated video editor | A project timeline is safer and easier to revise |
Limits and recovery
- Mosaic composition transcodes video and can use substantial CPU. Test at lower resolution before increasing the canvas or source count.
- Combining every source's audio can be unusable. Decide which audio tracks the output should contain before building the bridge chain.
- Use a dedicated editor when the goal is a saved multi-clip project with precise cuts, titles or transitions.
Related decisions
If you only need separate playback windows, use multiple VLC instances instead of a composed mosaic.
For a saved project with precise cuts and titles, review VLC’s video editing limits.
After the local grid works, use the VLC streaming and network guide to choose a deliberate output and keep the mosaic off the public internet.
Sources and corrections
Official VLC VLM mosaic example >Official VideoLAN Manager documentation >Menus can differ by VLC version and operating system. If a verified current build behaves differently, report the exact version and platform.