Live video mixing on Mac

Live video mixing means choosing and combining images while the performance is happening. You prepare sources in advance, then decide when a clip enters the mix, how layers interact and what the audience sees. A saved arrangement is only the starting point; the sequence of decisions happens live.

This guide uses UltimateVJ's documented workflow on a supported Mac. It is a preparation exercise, not a captured test of the current 0.3.2 (6) Research Preview. Check requirements, install and open the Quickstart for the app's detailed controls.

Think in four parts

A clip's Preview is not the same as the final audience output. A good-looking thumbnail also does not prove that a long clip, seek or transition will play correctly.

Prepare a small two-look exercise

Use two short clips you made yourself or have permission to use. Choose visually distinct material so you can tell which source is active. Keep the originals in a permanent media folder rather than a temporary download location.

Start a new set and import the files with File → Import media or Command I. The manual describes imported files filling successive columns on the selected layer. Check the status for import errors before continuing. Importing media explains validation, replacement and relinking.

First, trigger one clip and watch the Output monitor. Audition the second in Preview, then trigger it deliberately. Repeat until you can distinguish auditioning from sending a clip live without guessing. Use the visible preview control; the Quickstart shows Return for Live and the eye or Option-Return for Preview.

Add one layer and one effect

Place another source on a different layer and trigger it. Adjust that layer's opacity while watching program output. Return to a simple mix before adding an effect.

In the Inspector, choose Clip → Color, leave Color correction enabled and change Saturation. Compare the result on the selected clip, then consider how the same adjustment would differ at Layer or Master scope. Changing the wrong scope is an easy way to affect more of a mix than intended. The effect-stack guide explains scope and ordering.

Decide how much timing you need

Begin by triggering manually. Once the mix is understandable, try tap tempo or quantization using the timing guide. A visual does not need a beat-synced change on every beat.

If you enable Ableton Link, the documented behavior is shared tempo and bar phase. It does not synchronize transport start/stop. Do not plan a synchronized cue around a behavior the manual explicitly excludes.

Inspect the output path

Choose Performance → Open windowed output while preparing. For an external screen, connect it and choose the display under Performance → Fullscreen output. Look at the physical screen, not only the in-app monitor. Check framing, scaling and the way you return to the console. Escape closes fullscreen output.

The manual documents one physical output at a time, with no Syphon or NDI output. Requested frame rate and display resolution are settings; performance depends on your actual set and system. Read Output and fullscreen and limitations before adding more demanding requirements.

Save, reopen and repeat

Save the .uvj set, close it when safe, and reopen it from its saved location. Confirm both clips still resolve, the intended output is selected and the controls you need are usable. A set usually references your media by path; moving the files can break that connection.

When that small exercise works, add material a little at a time. The next useful step is preparing your first VJ set, including a media plan, reopen check and rehearsal notes. Do not treat completing this exercise as a performance-readiness certification.