【Veo 2 深淵】固定カメラの壁再び…「マンホール視点」からの挑戦とAIの不可解な論理

2025年4月20日2025年5月21日

こんにちは！ AI動画クリエイターのナナスケです。「AI 加工所」へようこそ！

さて、AI動画生成の世界は奥が深い…前回は、地面スレスレの超ローアングル、いわゆる「マンホール視点」から、赤い’73 ダッジ・チャレンジャーがカメラ上空を通過する超ダイナミックな映像を狙いました。しかし、結果は「カメラ固定」の指示にも関わらず、Veo 2が動くチャレンジャーを追尾してしまい、惜しくも目標達成ならず…。固定カメラ vs 動く被写体、このジレンマはなかなかの難しさです。

でも、ここで諦めるわけにはいきません！今回は、カメラの「絶対的な固定」を、これでもかというほどプロンプトで強調し、再度あの映像に挑みます！いわばAIとの根比べです！

絶対に動かないカメラ vs 迫り来る赤い脅威！

前回の反省を踏まえ、今回はプロンプトの中で「カメラが絶対に、何があっても動かない」という指示を、執拗なまでに繰り返してみました。AIへの厳重な警告のつもりです（笑）。

ナナスケのリクエスト：（「動くな！」と念押し！）

カメラを地面スレスレの絶対に動かない固定カメラに指定し、遠くから赤いチャレンジャーが迫って来て、カメラの上を通過する！

Gemini 2.5 Proによるプロンプト案（固定カメラ強調MAX版）：

JSON

{
  "prompt": "Shot from a **completely fixed, absolutely stationary, unmoving camera** positioned at **extreme low angle (worm's-eye view)** on the wet pavement surface of a New York City street at night, looking straight up. **There is absolutely no camera movement throughout the entire clip.** Far in the distance, the distinct headlights of a **red** 1973 Dodge Challenger appear. The car **accelerates directly towards the fixed camera position**, rapidly growing larger and looming menacingly from the viewer's low perspective. **Without the camera moving at all**, the massive car **roars directly over the stationary viewpoint**. The dark undercarriage (chassis, exhaust system) momentarily fills 100% of the frame, completely blocking the view of the neon-lit sky. Huge tires blur past extremely close on both sides of the **unmoving lens**. After passing, the car's rear end and taillights quickly recede into the distance down the street, revealing the sky again above the **static camera**. Focus entirely on the dramatic contrast between the **camera's absolute stillness** and the violent, high-speed passage of the car directly overhead.",
  "style": "cinematic, realistic, intense, dramatic, **fixed camera**, **stationary shot**, **locked-down shot**, worm's-eye view, extreme low angle",
  "keywords": [
    "**fixed camera**", "**stationary camera**", "**unmoving camera**", "**locked-down shot**", "**no camera movement whatsoever**",
    "extreme low angle shot", "ground level view", "worm's-eye view", "manhole cover perspective", "looking straight up",
    "**red** 1973 Dodge Challenger", "muscle car", "**approaching stationary camera**", "**driving over fixed camera**",
    "**passing over unmoving camera**", "undercarriage view", "chassis details", "exhaust pipes", "close-up tires",
    "night scene", "New York City", "NYC street", "wet pavement", "steam", "neon glow"
  ],
  "negative_prompt": [
    "**any camera movement**", "**tracking shot**", "**following shot**", "**panning**", "**tilting**", "**zooming**",
    "**camera shake (unless minimal from impact)**", "high angle shot", "eye level shot", "normal view", "drone shot",
    "side view", "rear view", "driver's POV", "interior view", "car turning away", "car avoiding camera",
    "car stopping before camera", "daylight", "calm scene"
  ]
}

「fixed camera」「stationary camera」「unmoving camera」「locked-down shot」「no camera movement whatsoever」…しつこいほどに「動かない」ことを強調！ネガティブプロンプトでも「any camera movement」を筆頭にあらゆるカメラの動きを禁止！これでどうだ、Veo 2！