動画

画像から動画

被写体、構図、スタイルを保ったまま参照画像をアニメーション化する方法。

約 1 分2 セクション

元画像が被写体と構図を決めます。プロンプトでは動き、テンポ、変えてはいけない要素を明示します。短いアニメーションほど制御しやすくなります。

実践の要点

速度、忠実度、解像度、制御性のどれを優先するかでモデルを選び、各結果のパラメータとバージョンを保存します。 wan2.7-video, kling-3.0-* and veo3.1-* — Image to video.

1 回の試行で変えるのは 1 点だけにします。良い出力を参照として残すと、次の反復で最も確実な出発点になります。

finished と failed は終端状態として扱います。polling または webhook を使い、生のエラーはサーバー側に保持し、利用者には安全なメッセージを表示してください。

プロンプトと API の例

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A matte-black espresso machine on a concrete counter with steam and morning light

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Steam rises and drifts left, the light slowly warms, camera pushes in very
slightly. Everything else stays still.

text

A hyperrealistic macro photo of tiny, miniature surfers riding ocean waves
inside a rustic stone bathroom sink. A vintage brass faucet is running,
creating the perpetual surf. Surreal, whimsical, bright natural lighting.

The Nano Banana source frame used for the image-to-video example below.

Source: Google AI for Developers, used under CC BY 4.0; format and dimensions adapted.

text

A surreal, cinematic macro video. Tiny surfers ride perpetual, rolling waves
inside a stone bathroom sink. A running vintage brass faucet generates the
endless surf. The camera slowly pans across the whimsical, sunlit scene as the
miniature figures expertly carve the turquoise water.

Veo 3.1 turns the still sink scene into a controlled macro pan while preserving the miniature surfers and faucet.

Source: Google AI for Developers, used under CC BY 4.0; format and dimensions adapted.

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Smooth continuous transition between the two framings, no cuts, natural
lighting change

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The character turns from the window toward the camera and smiles. Room tone
and distant traffic. No cuts.

text

The character performs the motion from the reference video, keeping their own
clothing and appearance

About these samples. Ready-made examples are copied to our own storage only when their source permits reuse. The exact prompt appears above each result, and the original source and license are linked below the media.

json

{
  "model": "seedance-2.0",
  "input": {
    "prompt": "The camera drifts left as the sun clears the ridge",
    "imageWithRoles": [
      { "url": "https://example.com/dawn.jpg", "role": "first_frame" },
      { "url": "https://example.com/noon.jpg", "role": "last_frame" }
    ],
    "resolution": "1080p",
    "duration": 8,
    "generateAudio": false
  }
}

json

{
  "model": "pixverse-v6",
  "input": {
    "prompt": "Slow dissolve between the two framings",
    "firstFrameImage": "https://example.com/dawn.jpg",
    "lastFrameImage": "https://example.com/noon.jpg",
    "duration": 5,
    "resolution": "720p"
  }
}

json

{
  "model": "wan2.7-video",
  "input": {
    "imageUrls": [
      "https://example.com/dawn.jpg",
      "https://example.com/noon.jpg"
    ],
    "resolution": "1080p",
    "duration": 5
  }
}

json

{
  "model": "kling-3.0-motion-control",
  "input": {
    "prompt": "Studio backdrop, soft key light",
    "imageUrls": ["https://example.com/character.png"],
    "videoUrls": ["https://example.com/dance-reference.mp4"],
    "characterOrientation": "image",
    "resolution": "1080p"
  }
}

json

{
  "model": "midjourney-video",
  "input": {
    "prompt": "Gentle parallax drift toward the archway",
    "imageUrls": ["https://example.com/still.png"],
    "videoType": "vid_1.1_i2v_720",
    "motion": "high",
    "batchSize": 1
  }
}

json

{
  "model": "midjourney-video",
  "input": {
    "parentTaskId": "019ca881-9503-7270-a560-f00fc2b15785",
    "index": 0,
    "animateMode": "auto",
    "videoType": "vid_1.1_i2v_480"
  }
}

curl -X POST https://api.api-stock.com/api/v1/generation/create \
  -H "Authorization: Bearer sk-your-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "veo3.1-fast",
    "input": {
      "prompt": "The gulls lift off and the boat rocks in the swell",
      "urls": ["https://example.com/harbour.jpg"],
      "generationType": "frame",
      "aspectRatio": "16:9"
    }
  }'

json

{
  "code": 200,
  "data": {
    "taskId": "019ca8a1-1c40-73f2-9b6d-4a01d8e2f7c3",
    "status": "not_started",
    "createdAt": "2026-02-28T12:04:11.000Z"
  }
}

const BASE = "https://api.api-stock.com/api/v1";
const KEY = process.env.API_STOCK_KEY!;

async function animate(imageUrl: string, prompt: string) {
  const create = await fetch(`${BASE}/generation/create`, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      model: "veo3.1-fast",
      input: {
        prompt,
        urls: [imageUrl],
        generationType: "frame",
        aspectRatio: "16:9",
      },
    }),
  });

  const created = await create.json();
  if (!create.ok) {
    throw new Error(`${created.error.code}: ${created.error.message}`);
  }

  const taskId: string = created.data.taskId;

  for (;;) {
    await new Promise((r) => setTimeout(r, 10_000));

    const res = await fetch(`${BASE}/task/status/${taskId}`, {
      headers: { Authorization: `Bearer ${KEY}` },
    });
    const body = await res.json().catch(() => null);
    if (!res.ok) {
      const message = body?.error?.message ?? `${res.status} ${res.statusText}`;
      throw new Error(message);
    }
    const { data } = body;

    if (data.status === "finished") return data.files[0].fileUrl;
    if (data.status === "failed" || data.status === "expired") {
      throw new Error(data.errorMessage);
    }
  }
}

const url = await animate(
  "https://example.com/harbour.jpg",
  "The gulls lift off and the boat rocks in the swell",
);
console.log(url); // → https://storage.api-stock.com/generated/video-...mp4

json

{
  "code": 200,
  "data": {
    "taskId": "019ca8a1-1c40-73f2-9b6d-4a01d8e2f7c3",
    "status": "finished",
    "files": [
      {
        "fileUrl": "https://storage.api-stock.com/generated/video-9f31c2.mp4",
        "fileType": "video"
      }
    ],
    "createdTime": "2026-02-28T12:04:11.000Z"
  }
}

自分の API キーで試す

API Stockのカタログでモデルと料金を確認し、ブラウザやAPIから試してください。

カタログを見る API リファレンス

画像から動画

実践の要点

プロンプトと API の例

自分の API キーで試す

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