grok-video-edit

原文涵盖的主题

• Grok (xAI) video editing
• Golden rule: always trim the target region first
• Chunking & seams
• Effects with aftermath — don't pop at the seam
• Character / consistency drift
• Prompt tips
• Parallelize independent edits
• Audio

Full Production Studio note: this skill drives the toolkit in agamm/video-agent. Clone that repo and run your agent inside it for the scripts/paths below to work; the guidance itself is usable anywhere. Use Grok for edits that require generative changes to the footage itself — recoloring objects, adding physical effects (smoke, fire, glow), restyling. For compositing a known asset (logo, text, PNG/animated graphic) onto video, use the video-overlay skill instead — it's deterministic and cheaper. Requires XAIAPIKEY in .env. grok-edit fullvideo.mp4 chunks the entire video even with --splice-into. Never send the full video. Workflow: 1. Find exact boundaries. Run detect with --step 1 --cell-w 384 inside the rough window to locate the frame-exact first/last frames of the subject. Trim to those exact boundaries so Grok doesn't reimagine irrelevant context. 2. Edit the segment: 3. Mux original audio back (Grok outputs video only, and drops 0.2–0.3s of frames): Always -shortest — without it the audio outlasts the shorter video track and everything downstream desyncs. 4. Final join with filtercomplex concat (re-encodes — kills keyframe freeze + drift): Do NOT use stream-copy concat after a

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