openrouter-image2video

Image + motion-prompt → video via OpenRouter. Default model: google/veo-3.1-fast.

Use this when you already have a strong still image and want to bring it to life with subtle motion (camera pan, parallax, gentle animation) while preserving the composition. For motion-from-scratch, use openrouter-text2video instead.

The script accepts either a remote image URL or a local image path; local files are base64-encoded and inlined into the request as a data URL.

Usage

Resolve TOOL_DIR = the directory containing this SKILL.md. Commands below use TOOL_DIR as a symbolic placeholder; replace it with the resolved, quoted path before running Bash.

export OPENROUTER_API_KEY=sk-or-v1-...

# From a local image you already generated with text2image
python3 TOOL_DIR/scripts/generate_video_from_image.py \
  --image PROJECT_DIR/assets/teaser.png \
  --prompt "slow parallax push-in, soft drift of ambient particles, no camera shake" \
  --duration 5 \
  --aspect-ratio 16:9 \
  --download PROJECT_DIR/assets/teaser.mp4

# Or from a remote URL
python3 TOOL_DIR/scripts/generate_video_from_image.py \
  --image-url "https://example.com/still.png" \
  --prompt "subtle camera dolly forward, gentle depth-of-field shift" \
  --download PROJECT_DIR/assets/scene.mp4

Flags

Flag	Default	Description
--prompt	required	Motion prompt — describe what should move and how
--download	required	Output MP4 path
--image	one of --image / --image-url required	Local image path (PNG/JPG); will be base64-encoded
--image-url	one of --image / --image-url required	Remote image URL
--model	google/veo-3.1-fast	Any OpenRouter image-to-video-capable model
--duration	5	Seconds
--aspect-ratio	16:9	16:9, 9:16, 1:1, 4:3, 3:4, 21:9, 9:21
--resolution	720p	Model-dependent (e.g. 480p, 720p, 1080p)
--frame-role	first	first or last — anchor frame role for the input image
--generate-audio	off	Generate audio with video (if model supports)
--poll-interval	5	Seconds between polls
--max-wait	600	Max total wait time

Flow

1. POST /api/v1/videos with body:

   {
     "model": "google/veo-3.1-fast",
     "prompt": "...motion prompt...",
     "aspect_ratio": "16:9",
     "duration": 5,
     "resolution": "720p",
     "frame_images": [
       {
         "type": "image_url",
         "frame_type": "first_frame",
         "image_url": {"url": "data:image/png;base64,..." }
       }
     ]
   }
   

   The --frame-role first|last flag maps to frame_type: "first_frame"|"last_frame".
2. GET /api/v1/videos/{id} every 5s until status == "completed"
3. GET /api/v1/videos/{id}/content → raw MP4 bytes

Notes

• Veo 3.1 Fast is optimized for low-latency image-to-video. Typical render ≈ 60-180s for a 5s 720p clip.
• The motion prompt should describe motion only, not the subject (the subject comes from the image).
• For subjects with prominent faces, keep motion subtle to avoid uncanny artifacts.
• If you also want a defined ending state, supply two images via frame_images with roles first and last. The current script wires only one anchor frame; extend body["frame_images"] to add a second.