Zhenzhen MJ Video

Midjourney does video now, and it's surprisingly good at it - the v7-era motion feels cinematic rather than wobbly. Comfly_mj_video is the node that brings it into ComfyUI, and its defining quirk is right in the README: one call generates four videos at once, billed as a single unit. You don't pick a winner; you get four variations to choose from, which for video is actually a sane workflow - video prompts are expensive to iterate on, so four takes per credit is a decent deal.

This node pairs with its sibling Comfly_mj_video_extend, which takes one of those four clips and extends it. Together they're the whole MJ-video story in this pack.

How it works

Prompt (and optionally an image, for image-to-video) goes to Midjourney's video endpoint via the Comfly proxy. The node waits for the batch, then returns four separate video outputs - each the pack's ComflyVideoAdapter wrapping a URL, so they plug straight into ComfyUI's Save Video node. Along with a task_id (the thing Comfly_mj_video_extend needs) and the raw response.

The inputs that matter

• prompt - the scene, with motion described. MJ video reads verbs well: "slow dolly-in, rain on the window, neon reflections."
• motion - Low (default) or high. Low motion keeps the camera calmer and the render more stable; high motion is where the interesting (and occasionally chaotic) shots happen. Start Low.
• image - optional IMAGE input for image-to-video: animate a still you already like.
• notify_hook - a webhook URL that the proxy can ping when the job's done. Useful if you're running long jobs in the background; empty is fine for interactive use.
• seed - lock the batch; 0 for random.

Outputs: video1, video2, video3, video4 (all VIDEO), task_id (STRING), response (STRING).

Install

Manager → Comfyui_Comfly, or:

cd ComfyUI/custom_nodes
git clone https://github.com/ainewsto/Comfyui_Comfly

Restart. No model downloads - requirements.txt is the usual aiohttp/requests/Pillow/numpy set. Key from ai.comfly.chat in Comflyapi.json or the node's api_key.

Where people get burned

The billing is the whole trap: each call is a unit, and it buys you exactly four videos. So treat every run as "four clips for one price" and pick the best rather than re-running the same prompt hoping for a better fourth take - each re-run is another full unit. Also, capture that task_id output: it's the only thing Comfly_mj_video_extend accepts, and it's per-batch, so losing it means losing the ability to extend any of the four. And the motion: high dial deserves respect - it's where clips go from "cinematic" to "wonky," so don't set it and walk away for the whole batch.