FAL Vidu Q1 Reference To Video (Soze)

Vidu is Shengshu's video model, and Q1's party trick is a control most video models don't give you: a movement_amplitude dial. You get to tell the model how much motion you actually want, from small (locked-off, gentle) to large (camera swooping, things moving). That single control makes it much easier to get a specific kind of clip instead of hoping the model's default energy matches your intent.

The inputs

Standard pack citation format here: @Image1, @Image2, etc., with up to seven reference images in image_1–image_7 (or image_batch, capped at 7). The prompt is capped at 1500 characters - shorter than some of the other nodes, so be economical. aspect_ratio is limited to 16:9, 9:16, and 1:1.

Then the dials that make Vidu Q1 distinctive:

• movement_amplitude - auto, small, medium, or large. Start with auto to see what the model wants to do, then pin it down. A talking head wants small; an action beat wants large.
• bgm - a plain boolean, default off. Flip it on and the clip comes back with background music. It's a binary - you don't get to pick the track, you get whatever the model decides fits.
• seed - 0 = random; set one for reproducible iteration.

No resolution picker, no audio sophistication, no duration option at all - Vidu decides the length. It's a focused node.

How it works

Same FAL machinery as the rest of the Soze pack: reference images upload to FAL's CDN, the node POSTs to fal-ai/vidu/q1/reference-to-video, waits synchronously, then downloads the mp4 to your output folder as a VIDEO object. Outputs are video, video_url, and status. Nothing runs on your GPU.

The movement_amplitude value is passed straight through to the API, so it's worth treating as the primary creative control - most reference-to-video models bury this decision in the prompt and hope. Here it's explicit, which is the whole reason to reach for Vidu over the generic options.

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; the config file is gitignored, don't commit it.

Common issues

• Too much or too little motion. That's exactly what movement_amplitude is for - don't fight it in the prompt, just turn the dial.
• Skips with no output. Needs at least one reference image; it's reference-to-video only.
• Length feels fixed. Q1 doesn't expose a duration control, so if the clip length doesn't suit you, this node isn't the place to fix it - frame your references for the timing you want.