Grok Imagine·par xAIVideo extend

Grok Imagine Video Extend

xAI Grok Imagine Video — continues an existing 2-15s MP4 with a prompt-driven 2-10s extension. Output matches input, capped at 720p.

Ouvrir dans l'espace de travail →xai/grok-imagine-video/extend-video

Paramètres

Paramètre	Type	Par défaut	Plage ou options
duration `duration` Extension length in seconds (2-10) added after the source video.	slider	6	2 – 10

Entrées

Fichiers que ce modèle accepte en plus du prompt.

Entrée	Accepte	Fichiers max.
Source video `video_url`	video	1	Obligatoire

Guide de prompt pour Grok Imagine

TARGET MODEL: Grok Imagine Video (xAI Aurora — autoregressive; picture AND audio co-generate in the same pass). The prose is the whole instrument: no seed, no negative_prompt, no audio toggle.

Règles à respecter

The formula, in timeline order: Subject + Action/Motion + Camera + Environment/Lighting + Style + Audio. Front-load the critical action — earlier words weigh more. 30-60 words optimal.
AUDIO IS ALWAYS ON with no silence flag: if the prompt doesn't specify sound, the clip gets silent or random audio — so ALWAYS write the audio in. Music, SFX timed to motion, ambient/room tone, lip-synced dialogue.
Dialogue: quote the line with a delivery-cue prefix — a quiet whisper: "We made it." · urgent shout: "Stop him!" — and keep lines SHORT (audio is the weakest layer; long lines turn to gibberish). Optional sound-design clause: AUDIO: soft room tone, faint kettle hiss.
ONE primary action and ONE named camera move per clip — conflicting moves (zoom+pan) break temporal coherence.
State motion magnitude explicitly — the model cannot infer it ("passing" → "passing quickly"). Strong verbs with intensity adverbs ("sprints", "surges", "pitches forward with tremendous force").
Negation is ignored — phrase every exclusion as the desired positive state ("sharp focus throughout", never "no blur").
One aesthetic per clip — never mix (no anime+photoreal). Lighting by source + direction.

Ce qui fonctionne le mieux

Camera vocabulary that lands: locked/static (strong default) · slow push-in · slow dolly-in · tracking shot alongside · handheld follow from behind · orbit/360 · slow crane pullback · rack focus · aerial push-in · pull-back · time-lapse. "Cinematic" or "dynamic camera" name nothing executable — name the move or lock the frame.
Avoid known failure modes: big body dynamics (jerky), extreme close-ups and macro hand work (distort), long photoreal holds (waxy morph). Favor short beats and implied/reaction motion.
Craft pattern for scenes with speech: scene → dialogue in quotes with its delivery cue → optional AUDIO: line.

Issu du manuel LUVI pour cette famille : les mêmes règles qu'appliquent le réécriveur de l'espace de travail et le moteur de prompt MCP.

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