veo-video-gen（veo 视频生成器）

Pixwith Veo 3.1 — AI Video Generation

Generate videos through Pixwith using its Veo 3.1 integration. Supports text-to-video and image-to-video with start and end frames.

⚠️ CRITICAL — Do NOT Alter API Response Values

ALL values returned by the API (task_id, result_urls, image_url, upload_url, fields) are opaque tokens. Use them EXACTLY as returned — do NOT add, remove, or change even a single character. Store each value in a shell variable and reuse it directly. A single wrong character in task_id or result_urls will cause errors or broken links.

Setup

This skill requires a PIXWITH_API_KEY environment variable.

If the variable is not set, guide the user through these steps:

1. Go to https://pixwith.ai/api and sign up / log in.
2. Click "Add" to create a new API key and copy it.
3. This skill requires a PIXWITH_API_KEY provided by the runtime environment

or the hosting platform's secret manager

If the API key is missing or invalid, instruct the user to create or verify a Pixwith API key from the Pixwith dashboard and provide it through the runtime's standard secret or environment-variable mechanism.

Verify by running:

curl -s -X POST https://api.pixwith.ai/api/task/get_credits \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY"

A successful response looks like {"code":1,"data":{"credits":500}}.

Pricing

Always inform the user of the cost before creating a task. Default to Fast unless the user explicitly requests higher quality or audio.

Model Parameters

• model_id: 2-11 (Fast) or 2-12 (Pro)
• prompt (required): Describe the video to generate.
• image_urls (optional): 1–2 publicly accessible image URLs.

- 1 image → used as the start frame. - 2 images → first is the start frame, second is the end frame.

• options.prompt_optimization (boolean, default true): Auto-translate prompt to English.
• options.aspect_ratio (required): 16:9 or 9:16.

Workflow A — Text-to-Video

Use when the user provides only a text prompt and no images.

Step 1: Check credits

curl -s -X POST https://api.pixwith.ai/api/task/get_credits \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY"

Verify data.credits >= 50 (Fast) or >= 200 (Pro).

Step 2: Create task

curl -s -X POST https://api.pixwith.ai/api/task/create \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY" \
  -d '{
    "prompt": "<user_prompt>",
    "model_id": "2-11",
    "options": {
      "prompt_optimization": true,
      "aspect_ratio": "16:9"
    }
  }'

Use "model_id": "2-12" for Pro tier.

Response contains data.task_id and data.estimated_time (seconds).

Step 3: Poll for results

Wait for estimated_time seconds, then poll:

curl -s -X POST https://api.pixwith.ai/api/task/get \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY" \
  -d '{"task_id": "<task_id>"}'

• data.status == 1 → still processing, wait 10 seconds and poll again.
• data.status == 2 → done, data.result_urls contains the video URL(s).
• data.status == 3 → failed, inform the user.

Video generation typically takes 60–180 seconds. Present the EXACT result_urls to the user.

Workflow B — Image-to-Video

Use when the user provides one or two reference images (start frame, optional end frame).

Step 1: Upload local images (if needed)

If the user provides a local file path (not a public URL), upload it first.

Upload constraints:

• Allowed formats: .jpg, .jpeg, .png only
• Maximum file size: 10 MB
• content_type must match the file: image/jpeg for .jpg/.jpeg, image/png for .png
• The presigned upload URL expires in 10 minutes

1a. Get a presigned upload URL:

curl -s -X POST https://api.pixwith.ai/api/task/pre_url \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY" \
  -d '{"image_name": "frame.jpg", "content_type": "image/jpeg"}'

Set content_type based on the file extension:

• .jpg / .jpeg → "image/jpeg"
• .png → "image/png"

Response:

• data.upload_url — presigned POST data (url + fields)
• data.image_url — the final CDN URL to use in image_urls

1b. Upload the file using the presigned data:

curl -s -X POST "<upload_url.url>" \
  -F "key=<upload_url.fields.key>" \
  -F "Content-Type=<upload_url.fields.Content-Type>" \
  -F "x-amz-credential=<upload_url.fields.x-amz-credential>" \
  -F "x-amz-algorithm=<upload_url.fields.x-amz-algorithm>" \
  -F "x-amz-date=<upload_url.fields.x-amz-date>" \
  -F "x-amz-signature=<upload_url.fields.x-amz-signature>" \
  -F "policy=<upload_url.fields.policy>" \
  -F "file=@/path/to/local/image.jpg"

Fill every field from the upload_url.fields object into the form. After upload, use data.image_url from step 1a as the image URL.

Repeat for a second image if the user wants to specify an end frame. If the user already has public image URLs (start with http), skip this step.

Step 2: Check credits

Same as Workflow A, Step 1.

Step 3: Create task with images

curl -s -X POST https://api.pixwith.ai/api/task/create \
  -H "Content-Type: application/json" \
  -H "Api-Key: $PIXWITH_API_KEY" \
  -d '{
    "prompt": "<video_description>",
    "image_urls": ["<start_frame_url>", "<end_frame_url>"],
    "model_id": "2-11",
    "options": {
      "prompt_optimization": true,
      "aspect_ratio": "16:9"
    }
  }'

• Pass 1 URL for start-frame-only mode.
• Pass 2 URLs for start + end frame mode.

Step 4: Poll for results

Same as Workflow A, Step 3.

Choosing Between Fast and Pro

Default to Fast unless the user requests:

• "high quality", "HD", "professional" → use Pro
• "with audio", "with sound" → use Pro
• "quick", "fast", "preview", "draft" → use Fast

Error Handling

All API responses follow {"code": 1, "message": "success", "data": {...}}. When code is 0, message contains the error. Common errors:

• Invalid API KEY — key is missing, wrong, or disabled.
• Credits not enough — user needs to purchase more credits at https://pixwith.ai/pricing.
• Invalid image format — only jpg, png, jpeg are supported.
• Invalid image url — the URL is not publicly accessible.

Defaults

When the user does not specify preferences, use these defaults:

• model_id: 2-11 (Fast)
• aspect_ratio: 16:9
• prompt_optimization: true