grok / edit-video

Take an existing clip and change it with words. CivitaiVideoGenGrokEditVideo is xAI Grok's edit-video mode on Civitai's cloud: you wire in a source video, write a prompt describing the edit ("make it night, add rain, keep the camera move"), and get a modified clip back. It's prompt-driven video editing, which sounds like magic and mostly is - a whole different thing from video upscaling or interpolation, because the model re-renders the content rather than just cleaning it up.

It lives in Civitai/Video/grok, part of Civitai's official ComfyUI pack. Where image-to-video is "animate a still," this is "rewrite a clip." You can restyle footage, change the environment, swap the mood - anything Grok's model understands well enough to re-imagine. The catch is that it's a closed cloud model: the source video goes up to Civitai's servers, the job costs Buzz, and Grok's own content filters apply to what it will edit.

How it works

The node submits a videoGen workflow (engine: grok, operation: edit-video) to Civitai's Orchestration API. The video_url input is a VIDEO socket - wire in any video from your graph (a Load Video node, a clip from another Civitai video node). The pack uploads it, the cloud analyzes and re-renders it per your prompt, and the result returns as a native VIDEO tensor plus workflow_id and raw_json.

The inputs that matter

• prompt (required) - the edit you want. Specificity pays: "convert to a neon-noir cyberpunk scene, characters unchanged, add slow zoom" gives the model something to work with.
• video_url (required) - the source clip to edit.
• duration - output length in seconds, 1–15, default 6.
• resolution - 480p or 720p, default 720p.
• analyzed_duration - how much of the source the model should consider (0 = default/full). Leave it alone unless you want to restrict the edit to a portion of a long clip.

Installing it

This is one of ~160 nodes in Civitai Comfy Nodes, Civitai's official pack for their Orchestration API:

• ComfyUI Manager: Manager → Custom Nodes Manager → search Civitai Comfy Nodes → Install, then restart.
• CLI: comfy node registry-install civitai-comfy-nodes
• Source: cd ComfyUI/custom_nodes && git clone https://github.com/civitai/civitai-comfy-nodes.git && pip install -r civitai-comfy-nodes/requirements.txt (just requests).

You need a Civitai account with Buzz and credentials - a Civitai Auth node, CIVITAI_API_TOKEN (best for headless), or a stored key via the Civitai sidebar.

Where people get burned

• No credentials → immediate error. Export CIVITAI_API_TOKEN and restart ComfyUI.
• Source video is uploaded to the cloud. The whole clip leaves your machine and hits Civitai's servers. That's the mechanism, not a bug - but budget for it (privacy, and upload time for long clips).
• Video editing is the priciest meter in the pack. Per-second cloud video plus the upload; check the cost report on the node after a run. The community's standing objection to API video is exactly this bill.
• Grok's filter is not bypassable. Closed model, own moderation on top of Civitai's. If it won't do the edit, there's no local patch.
• Early preview. The README warns of breaking changes without notice; early community reports flagged slow jobs and bugs. Long edits can hit the default 30-minute timeout - raise it via the Auth node or CIVITAI_COMFY_TIMEOUT.

If you've got footage you want re-lit or re-scened in one shot, this is the node. Keep the source clip short, the prompt concrete, and the Buzz meter visible.