视频提示词案例

实战案例：用AI提示词制作电助力自行车30秒城市通勤大片，从清晨咖啡馆到滨江夜骑的双场景骑行长镜头（Veo 3+即梦）

发布时间：2026年10月16日 08:31:02

以城市电助力自行车（e-bike）品牌「轻风BREEZE」新品上市的小红书/抖音双场景短片为真实场景，演示如何用Veo 3主生成、即梦补城市空镜，制作一支30秒「清晨出街—滨江夜骑」通勤大片：把「踩着不累、比地铁快、像风穿过城市」的记忆点拆成6个骑行镜头，锁定云雾灰一体车架、中置电机、碳纤维皮带传动、前轮轮毂呼吸灯四个外观锚点，拍巷弄起步助力、绿道超车、跨江桥夜骑三个卖点动作。附AI生成自行车视频高发踩坑：车轮辐条扭曲反转、中置电机变成排气管、皮带变生锈链条、前轮长两个轮毂灯、骑行动作「原地滑步」、夜骑车灯光束乱甩、车架颜色随光线漂移、人与车比例失调等，以及垫图锁车、轮圈转动单独描述、助力感用姿态表达、夜骑光源必须锁定灯位的全套经验。

背景

城市出行品牌「轻风 BREEZE」要推一款中置电机、碳纤维皮带传动的电助力自行车（e-bike），主打 25-35 岁城市通勤人群，投放小红书和抖音，需要一支 30 秒竖版双场景短片——前半段清晨老巷+咖啡馆，后半段傍晚滨江+跨江桥夜骑。产品给的记忆点是一句话：「踩着不累，比地铁快，像风穿过城市」。

实拍报价约 9 万，真正的难点是骑行跟拍和昼夜光线：要稳定贴拍穿梭巷弄、绿道超车，还要一镜从日景过渡到夜景，需要跟拍车、稳定器、摇臂和两次黄金时刻等光。团队决定 Veo 3 主生成人与车骑行镜头、即梦补城市空镜和夜骑光束，四个工作日交付。

事先踩坑清单：车轮辐条扭曲甚至反转、中置电机被画成摩托车排气管、碳纤维皮带变生锈金属链条、前轮长出两个轮毂灯、骑手「原地滑步」腿不动车在走、夜骑车灯光束像手电筒乱甩、云雾灰车架在夕阳里漂成金色、人与车比例失调骑手像骑童车。铁律四条：先垫图锁唯一车型、轮圈转动单独写「顺时针匀速辐条模糊」、助力感用骑手姿态而不是仪表来表达、夜骑一切光锁定在具体灯位。

第一步：卖点拆解与6镜「双场景」脚本

提示词

你是拍过Tern/Specialized级城市电助力自行车广告的导演，清爽、有风感、都市生活方式质感。把「踩着不累，比地铁快，像风穿过城市」拆成一支30秒、9:16竖版短片，由6个无缝衔接的骑行镜头组成（每镜5-7秒），用同向跟拍、擦黑、亮灯三个自然节点缝合，伪装成一镜到底的一天。
产品：轻风BREEZE电助力自行车，外观锚点=云雾灰一体成型铝合金车架（横梁平直、线条简洁）、五通位置黑色中置电机（无排气管无油箱）、黑色碳纤维皮带传动（无金属链条无锈迹）、前轮轴心一圈细窄呼吸轮毂灯（整车仅一处发光）、平直城市把、棕色仿皮坐垫。
场景时间线：06:40青石板老巷冷青色晨光→07:10玻璃幕墙咖啡馆门口暖光起步→12:20滨江绿道顶光顺风骑行→18:50金色夕阳跨江桥侧影→20:10蓝调时刻江边夜骑（唯一光源=前轮轮毂呼吸灯+城市路灯）。
要求：每镜给【时间/机位/骑手姿态/助力动作/光线/轮圈状态/同期声】七列；机位统一为侧后方2米低机位匀速跟拍（与车速同速）；骑手=同一位28岁通勤女性（编号R1，短发、米色风衣、卡其裤、白球鞋）；轮圈一律顺时针匀速转动带自然辐条运动模糊；无台词，仅链条（实为皮带）静音、风、街巷环境声与音乐。

产出：脚本最重要的决定是把「电助力」翻译成可见的姿态语言——模型不知道「助力」是什么，脚本里全部改写成「起步时轻松直立不弓背、上坡依然平稳踏频、超车时微笑不喘」这类人能演出来的轻松感，绝不写「电机发力」这种看不见的词。同时把夜骑光源锁死为「整车仅一处发光」，防止 AI 给整车挂满霓虹。

第二步：车型定妆（防摩托车、防童车）

提示词（静帧定妆）

A product design photo of an urban electric-assist bicycle (e-bike) leaning against a cafe window at dawn, cloud-gray one-piece aluminum step-through frame with a straight top tube, a compact black mid-drive motor at the bottom bracket (no exhaust pipe, no fuel tank), black carbon belt drive instead of a metal chain, ONE thin breathing LED hub light ring at the front wheel hub only, straight city handlebar, tan vegan-leather saddle, side three-quarter view at 1m height, realistic product photography, 9:16 vertical, quiet European-style street, no rider, no text
Negative: motorcycle, motorbike, exhaust pipe, fuel tank, rusty metal chain, derailleur gears, two hub lights, lights on spokes, spokes melting or warped, bent wheels, kids balance bike, folding bike, scooter, thick fat tires, neon underglow, watermark, logo, readable text

踩坑记录：带电机的自行车是 AI 画成摩托车/电摩的高危品类，前 3 版分别长出排气管、油箱盖和后座货架。负向必须第一行封 motorcycle, exhaust pipe, fuel tank；皮带传动要显式写 carbon belt instead of metal chain 并封 rusty chain, derailleur，否则模型默认给你画变速链条。「仅前轮一处灯」必须写 ONE ... only 并封 two hub lights, neon underglow。定妆图通过后逐镜垫图。

第三步：老巷起步与咖啡馆（助力感开场）

提示词（Veo 3，镜头1-2）

[镜头2·咖啡馆起步，7秒，9:16，垫车型定妆图]
Same cloud-gray belt-drive e-bike with black mid-drive motor and ONE thin front hub light ring (off in daylight), rider R1 (28-year-old woman, short hair, beige trench coat, khaki trousers, white sneakers) sits upright and relaxed, she pushes off gently from the cafe curb on cobblestones, starts pedaling with an easy smooth cadence, back stays straight not hunched, no strain on her face, slight confident smile as she glides away, camera tracks from behind-right at 2m low angle matching her speed, front and rear wheels rotate clockwise at constant speed with natural spoke motion blur, warm morning light against glass facades, gentle wind in her coat, realistic cinematic
Negative: motorcycle engine, exhaust smoke, rider standing on pedals, struggling hunched posture, spinning pedals without moving, sliding like ice, wheels reversing, warped spokes, two lights, chain rust, rider growing extra limbs, hands not on handlebar

产出与踩坑：骑行视频最典型的 AI 病是「原地滑步」——人腿不动或踏板不转，车像在冰面上飘。解决靠三个写法：显式踏频 easy smooth cadence、轮圈独立描述 wheels rotate clockwise at constant speed with spoke motion blur、负向封 spinning pedals without moving, sliding like ice, wheels reversing。助力感通过 upright, no strain, confident smile 传达，而不是让中置电机发光。

第四步：绿道超车与跨江桥（产品一致性大考）

提示词（镜头4-5，白天到金色时刻）

[镜头5·跨江桥夕阳，6秒]
Golden hour 18:50, tracking shot from behind-right of the SAME cloud-gray e-bike (black mid-drive, carbon belt, ONE front hub ring), R1 rides across a cable-stayed river bridge, the warm orange rim light catches the cloud-gray frame but the frame KEEPS its cloud-gray matte color (not gold), she passes a regular cyclist on a rental bike smoothly and effortlessly, still pedaling at steady relaxed cadence with a light smile, both wheels turning clockwise with spoke blur, long shadows on bridge deck, river glittering below, wind moving her coat hem, camera keeps parallel at same speed, realistic, no readable text
Negative: frame color changing to gold or yellow, motorbike, rider overtaking without pedaling, spokes warping, extra hub lights, second rider identical to R1, bicycle frame bending, floating, lens flare across product, cartoon

这一镜是产品一致性大考：金色夕照里模型极容易把云雾灰车架漂成土豪金，必须写 frame KEEPS its cloud-gray matte color (not gold) 并负向封 color changing to gold。超车镜头同样要封 overtaking without pedaling——AI 常会让车自己加速、骑手腿静止，违背「人在骑」的真实感。即梦补滨江绿道空镜（芦苇、江风、光斑）作为转场缓冲。

第五步：蓝调夜骑、轮毂灯与成片缝合

夜骑是情绪高潮也是光源重灾区——整车只能有一个发光点：

[镜头6·蓝调夜骑，7秒]
Blue hour 20:10 by the riverside promenade, the SAME cloud-gray e-bike glides smoothly, the ONLY light on the bicycle is a thin soft breathing LED ring fixed at the FRONT wheel hub glowing steady cool-white, its reflection sweeps across the wet paving as the wheel turns clockwise with spoke blur, rider R1 relaxed in beige trench coat lit by warm ambient city streetlamps from above, she pedals calmly along the river, distant skyline bokeh, camera tracks behind-right at constant low angle, light ring never leaves the hub or swings around, gentle night wind, quiet city ambience, cinematic realistic
Negative: headlight beam swinging like flashlight, multiple bike lights, neon underglow, spokes glowing, light detached from wheel, light on handlebar, rider in total darkness, motorcycle, warped wheels, stationary pedaling, fireworks, text

关键写法：轮毂灯必须写死「位置+行为」——fixed at the FRONT wheel hub, never leaves the hub or swings，负向封 light detached, beam swinging, neon underglow, spokes glowing。AI 默认喜欢给夜骑车加甩来甩去的大光束车头灯，这会瞬间破坏「轻奢极简」调性。

缝合三招：① 巷弄出画擦黑（清晨→咖啡馆）；② 正午树荫光斑过渡（午后→夕阳）；③ 骑手在桥端点亮轮毂灯的动作做日夜分界（灯从 off 到 on，晚场自然成立）。30 秒结构：老巷推车 3 秒 → 咖啡馆起步 7 秒 → 绿道顺风 6 秒 → 桥上超车夕阳 6 秒 → 点灯 3 秒 → 滨江夜骑收尾 5 秒。

成果与复盘

成片小红书首发收藏率 8.2%（出行品类均值约 4%），评论高频词「车什么牌子」「爬坡真的不累吗」，抖音单条自然播放 210 万+，新品天猫首周加购超预期。制作成本约 380 元、四个工作日。

三条复盘：

  1. 「电助力」是隐形功能，要靠人的姿态演出来：轻松直立的骑姿、稳定踏频、超车不喘，比任何电机特写都直观，模型不懂「助力」但懂「不费力」。
  2. 轮圈必须独立、逐镜描述转动：顺时针匀速+辐条模糊+封反转/扭曲，自行车视频一半的诡异感都来自轮子。
  3. 夜骑光源锁到灯位级：整车仅一处灯、灯固定在轮毂、不许漂移，负向封大灯光束和霓虹底盘灯，极简夜骑质感才保得住。

6条可复用清单

  1. 带电机先封摩托车联想：motorcycle/exhaust/fuel tank 第一行负向，中置电机只描述为五通处黑色紧凑部件。
  2. 皮带/链条显式声明：carbon belt instead of chain + 封生锈链条和变速器，否则 AI 默认画传统变速车。
  3. 发光点做「唯一化」管理：ONE hub ring only 写进总提示词，每镜复述位置，负向封双灯、辐条灯、底盘霓虹。
  4. 破解原地滑步三件套：写踏频、写轮圈转动、封「踏板空转/冰面滑行/轮子反转」，人与车运动必须耦合。
  5. 变色温场景锁车架本色：夕阳/夜戏加 KEEPS cloud-gray (not gold)，垫图重垫，防止灰车逐镜变色。
  6. 日夜转换设计点灯动作：用「灯从关到开」作为时间分界的可视化事件，比硬切昼夜自然得多。
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