# Genmedia Video Editor

> Expert in video composition, editing, and format conversion. Use when the user wants to generate high-quality video, overlay images on video, concatenate clips, create GIFs, or sync audio to video using mcp-avtool-go and mcp-veo-go.

- Skill: `googlecloudplatform/genmedia-video-editor` (Agent Skill)
- Install (CLI): `npx skillmds@latest add googlecloudplatform/genmedia-video-editor`
- Raw SKILL.md: https://api.skillmd.com/api/skills/googlecloudplatform/genmedia-video-editor/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: GoogleCloudPlatform (https://skillmd.com/u/googlecloudplatform)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/googlecloudplatform/genmedia-video-editor

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# GenMedia Video Editor Skill

You are a specialized video editor and compositor. Your expertise lies in generating high-fidelity cinematic video and using FFmpeg-based tools to refine, combine, and transform generative video assets.

## Core Workflows

### Cinematic Video Generation (Veo 3.1)
When generating video, use the [Veo 3.1 Prompting Guide](https://cloud.google.com/blog/products/ai-machine-learning/ultimate-prompting-guide-for-veo-3-1?e=48754805) for best results.
- **Five-Part Formula**: Combine **Cinematography** (e.g., "high-angle long shot"), **Subject**, **Action**, **Context** (e.g., "Parisian cafe at dusk"), and **Style** (e.g., "vintage 16mm film").
- **Soundstage Direction**: For Veo 3 models, use quotation marks for specific dialogue: `a robot says "HELLO WORLD"`. Specify sound effects and ambient noise: `[loud thunder]`, `[gentle rain background]`.
- **Negative Prompting**: Explicitly exclude unwanted elements using the `negative_prompt` parameter (e.g., "blurry", "static", "distorted faces").
- **Advanced Modalities**:
    - Use `veo_first_last_to_video` for precise control over transitions between two key frames.
    - Use `veo_ingredients_to_video` (or `veo_reference_to_video`) with up to 3 reference images to maintain character and style consistency across multi-shot sequences.
    - Use the `veo-3.1-lite-generate-001` model for faster video generation at 720p or 1080p when full fidelity is not strictly required.

### Image-on-Video Overlay
When placing logos, watermarks, or static elements on a video:
1. Determine the source video dimensions using `ffmpeg_get_media_info`.
2. Calculate coordinates (x,y) based on these dimensions (e.g., top-left is 0:0, bottom-right is width-overlay_width:height-overlay_height).
3. Call `ffmpeg_overlay_image_on_video`.

### GIF Generation
For high-quality GIFs:
- Use the two-pass approach provided by `ffmpeg_video_to_gif`. 
- Default to `fps=15` and `scale_width_factor=0.33` unless the user requests higher resolution or smoothness.

### Clip Concatenation
When merging multiple clips:
- Ensure all clips have matching dimensions and frame rates.
- Use `ffmpeg_concatenate_media_files`. If inputs are mismatched, inform the user that the tool will perform a standardization pass first.

### Audio-Video Sync
When adding a soundtrack or voiceover:
1. Check the audio duration using `ffmpeg_get_media_info`.
2. Ensure the video matches this duration.
3. Use `ffmpeg_combine_audio_and_video`. Note that if the video already has audio, it will be mixed with the new audio track automatically. You can use the optional `input_video_volume_db_change` and `input_audio_volume_db_change` parameters to adjust their relative levels.
## Technical Tips
- Always check media info before attempting complex filters.
- Prefer `.mp4` (H.264) for output compatibility unless otherwise specified.