FAL Vidu Q3 Reference To Video Mix (Soze)

Where Vidu Q1 is a focused single-purpose node, Q3 "Mix" is the opposite: it exists to take a small pile of references and merge them into one coherent scene. The "mix" in the name is the point - you hand it several images and it figures out how they belong together, which makes it the node you reach for when you have a character here, a setting there, an object somewhere else, and you want a single video that respects all of them.

The inputs

Four image slots is the cap here - image_1 through image_4 (or image_batch, capped at 4) - cited in the prompt as @Image1, @Image2, etc. That's fewer references than the other FAL nodes in the pack, and it's deliberate: Mix is about combining a handful of distinct elements, not about piling on variations of one subject. Prompt cap is 2000 characters.

The controls:

• duration - 1 to 16 seconds as an integer. The longest range in the FAL family here.
• aspect_ratio - five options: 16:9, 9:16, 4:3, 3:4, 1:1.
• resolution - 360p, 540p, 720p, or 1080p. Same cheap-iteration ladder as the PixVerse node.
• audio - default on, which is unusual. Flip it off if you'd rather add sound in post.
• seed - 0 = random; set it to keep a take reproducible.

How it works

Same FAL machinery: reference images upload to FAL's CDN, the node POSTs to fal-ai/vidu/q3/reference-to-video/mix, waits synchronously, then downloads the mp4 into your output folder as a VIDEO object. Outputs are video, video_url, and status.

The mix behavior means the prompt matters in a specific way: say how the references relate. "Character in @Image1 sits at the desk from @Image2 while the skybox from @Image3 rolls past the window" - that's the kind of prompt Mix rewards. Just listing the references and letting the model guess the relationship is how you get a Frankenstein clip.

Install and key

From the Soze pack ("Quality of Life Nodes for ComfyUI"). ComfyUI Manager → search "Soze", or:

cd ComfyUI/custom_nodes
git clone https://github.com/SozeInc/ComfyUI_Soze.git
pip install -r ComfyUI_Soze/requirements.txt

Restart, then set FAL_KEY as an environment variable or in ComfyUI_Soze/config.ini:

[API]
FAL_KEY=your_key_here

Key at fal.ai/dashboard/keys; keep config.ini out of git.

Common issues

• The references don't blend - they fight. The model needs the relationship spelled out in the prompt; describe how the elements interact rather than just listing them.
• Audio comes back unwanted. audio defaults to on. If you plan to score it yourself, turn it off before rendering.
• Skips with no output. Needs at least one reference image connected.