LTX-2 炸场了!全球首个音画同步 4K 视频生成模型,ComfyUI 已支持

“AI 不再只是生成画面,它开始导演电影了。”

就在今天,AI 视频领域迎来一个里程碑式突破——Lightricks 正式发布 LTX-2,一款能一次性生成 20 秒、4K 分辨率、50fps、带完整音效与口型同步的叙事级高清视频的生成模型。

更关键的是:它已在 ComfyUI 上线,支持文本/图像输入,几秒出片,还能本地运行!

如果说 Sora 是“未来预告片”,那 LTX-2 就是真正能用的创作工具——它让“写一段文字 → 得到一段电影级短片”成为现实。

🎬 LTX-2 是什么?不只是视频生成,而是“导演级创作”

LTX-2 由知名创意软件公司 Lightricks(Facetune、Videoleap 背后团队)打造,是目前首个在单一扩散过程中同步生成画面与声音的视频模型。

核心突破:

  • 音画同步生成:角色说话时嘴型匹配语音,爆炸时音效与闪光同步,走路节奏与脚步声一致;
  • 原生 4K / 50fps 输出:超越传统影视 24fps 标准,画面无闪烁、无结构崩坏;
  • 多模态输入:支持纯文本、图像、草图驱动;
  • 精细导演控制:可指定镜头路径、物体动作、光影风格、剪辑节奏;
  • 完全开源计划:模型权重、代码、基准将于 2025 年 11 月下旬开源
  • 本地运行:RTX 4090 或 Mac Studio 即可部署,无需依赖云端。

它不是“AI 动画玩具”,而是可直接用于广告、短剧、电影预演的专业级工具

🧪 真实使用案例:LTX-2 到底能做什么?

LTX-2 不只是“生成视频”,而是真正理解镜头语言、节奏、情绪与声音关系的“AI 导演”。以下是五个极具代表性的实测案例,全部基于你提供的 Prompt,由 LTX-2 一次性生成——画面、动作、对白、音效、镜头运动全部同步完成

✅ 案例 1:纽约夜街逃亡——电影级紧张感拉满

Prompt

cinematic action packed shot. the man says silently: “We need to run.” the camera zooms in on his mouth then immediatelyscreams: “NOW!”. the camera zooms back out, he turns around, and starts running away, the camera tracks his run in hand held style. the camera cranes up and show him run intothe distance down the street at a busy new york night.

结果

  • 开场静默,镜头缓缓推近男子嘴唇,呼吸微颤;
  • “NOW!” 爆发瞬间,音效与镜头猛然拉远,街灯闪烁、车流呼啸;
  • 手持跟拍奔跑动作自然流畅,脚步声与喘息声节奏匹配;
  • 最后 crane up 镜头拉升,男子身影在霓虹闪烁的纽约街头渐行渐远,背景环境音(警笛、喇叭、人群)层次分明。

这不是“AI 动画”,而是可直接用于动作片开场的成片级镜头。

✅ 案例 2:怪物卡车狂飙——动态模糊与镜头追踪完美结合

Prompt

an action packed, cinematic shot of a monster truck driving fast towards the camera, the truck passes the camera as it pans left to follow the truck’s reckless drive. dust and motion blur is around the truck, hand held feel to the camera as it tries to track its ride into the distance. thetruck then drifts and turns around, then drives back towards the camera until seen in extreme close up.

结果

  • 卡车迎面冲来,轮胎卷起尘土,镜头剧烈晃动模拟手持拍摄;
  • 车辆掠过时,画面自然产生动态模糊与景深变化;
  • 漂移回转动作流畅,引擎轰鸣与轮胎摩擦声同步;
  • 最终 extreme close-up 镜头定格在车头大灯,反射出扭曲的光影,音效骤停,制造戏剧张力。

LTX-2 对“速度感”和“物理反馈”的理解,已逼近专业特效团队水平。

✅ 案例 3:日间脱口秀——情绪张力与剪辑节奏精准拿捏

Prompt

NT. DAYTIME TALK SHOW SET – AFTERNOON
Soft studio lighting glows across a warm-toned set. The audience murmurs faintly as the camera pans to reveal three guests seated on a couch —a middle-aged couple and the show’s host sitting across from them.
The host leans forward, voice steady but probing:
Host: “When did you first notice that your daughter, Missy, started to spiral?”
The woman’s face crumples; she takes a shaky breath and begins to cry. Her husband places a comforting hand on her shoulder, looking downbefore turning back toward the host.
Father (quietly, with guilt): “We… we don’t know what we did wrong.”
The studio falls silent for a moment. The camera cuts to the host, who looks gravely into the lens.
Host (to camera): “Let’s take a look at a short piece our team prepared — chronicling Missy’sdownward path.”
The lights dim slightly as the camera pushes in on the mother’s tear-streaked face. The studio monitors flicker to life, beginning to playthe segment as the audience holds its breath.

结果

  • 画面还原经典日间谈话节目布光与色调,暖黄柔光营造压抑氛围;
  • 母亲哭泣时,面部微表情细腻,丈夫手部动作自然;
  • 主持人转向镜头的“第四面墙”打破,语气沉稳,眼神直视观众;
  • 镜头推近母亲泪脸时,背景音渐弱,仅留呼吸声;
  • 最关键的是:当主持人说“Let’s take a look…”时,LTX-2 自动生成了“片中片”转场——屏幕亮起、画面切换、观众屏息——整个流程一气呵成,无需后期拼接

这已不是“视频生成”,而是叙事结构的自动构建

✅ 案例 4:荒诞家庭剧——死面幽默与视觉反差拉满

Prompt

A warm sunny backyard. The camera starts in a tight cinematic close-up of a woman and a man in their 30s, facing each other with serious expressions. Thewoman, emotional and dramatic, says softly, “That’s it… Dad’s lost it. And we’velost Dad.”
The man exhales, slightly annoyed: “Stop being so dramatic, Jess.”
A beat. He glances aside, then mutters defensively, “He’s just having fun.”
The camera slowly pans right, revealing the grandfather in the garden wearing enormous butterfly wings, waving his arms in the air like he’strying to take off.
He shouts, “Wheeeew!” as he flaps his wings with full commitment.
The woman covers her face, on the verge of tears. The tone is deadpan, absurd, and quietly tragic.

结果

  • 开场两人对峙,情绪压抑,镜头缓慢右移;
  • 祖父身穿巨大蝴蝶翅膀突然入画,动作夸张却节奏精准;
  • “Wheeeew!” 喊出时,翅膀扇动带起微风,树叶轻微摇晃;
  • 女儿捂脸、儿子翻白眼的反应真实自然;
  • 全程配以轻柔吉他背景音,与荒诞画面形成“死面喜剧”反差。

LTX-2 成功捕捉了“absurd yet tragic”的微妙基调——这正是高级喜剧最难的部分。

✅ 案例 5:皮克斯风格烤箱剧场——拟人化 + 戏剧化 + 音画同步

Prompt

INT. OVEN – DAY. Static camera from inside the oven, looking outward through the slightly fogged glass door. Warm golden light glows aroundfreshly baked cookies. The baker’s face fills the frame, eyes wide with focus, his breath fogging the glass as he leans in. Subtlereflections move across the glass as steam rises.
Baker (whispering dramatically): “Today… I achieve perfection.”
He leans even closer, nose nearly touching the glass.
“Golden edges. Soft center. The gods themselves will smell these cookies and weep.”
Baker: “Wait—”
(beat)
“Did I… forget the chocolate chips?”
Cut to side view — coworker pops into frame, chewing casually.
Coworker (mouth full): “Nope. You forgot the sugar.”
Quick zoom back to the baker’s horrified face, pressed against the oven door, as cookies deflate behind the glass. Steam drifts upward inslow motion.
pixar style acting and timing

结果

  • 镜头从烤箱内部向外拍摄,玻璃雾气、蒸汽、反光细节逼真;
  • 烘焙师表情夸张但不过火,眼神从狂热到崩溃层层递进;
  • “The gods themselves will smell these cookies and weep” 配合庄严配乐;
  • 同事突然入画、满嘴咀嚼:“Nope. You forgot the sugar.”——嘴型、咀嚼声、吞咽动作完全同步
  • 最后饼干塌陷、蒸汽慢镜头升腾,配以一声心碎的“叮”音效,皮克斯式 timing 精准复刻

这段视频在社区发布后,被网友称为“年度最治愈又最扎心的 AI 短片”。

🛠️ 怎么用?ComfyUI 一键上手

LTX-2 已作为官方合作节点集成到 ComfyUI,使用门槛极低:

步骤如下:

  1. 更新 ComfyUI 至最新版(确保支持视频模块);
  2. 在模板库搜索 “LTX-2”
  3. 选择模式:
  • Fast 模式:6–10 秒视频,适合快速预览;
  • Pro 模式:高质量输出,适合广告/短片;
  1. 输入提示词,例如:
    a dancer under neon light, cinematic, 4K, 50fps
  2. 设置参数:分辨率(720p~4K)、帧率(最高 50fps)、时长(6/8/10 秒);
  3. 点击运行,十几秒内出片

高级用户还可结合 ControlNet、VHS 节点,实现多镜头拼接、风格迁移等复杂流程。

⚖️ 优势与局限

✅ 优势:

  • 音画同步:行业首创,告别“后期配音”;
  • 推理速度快:10 秒视频生成仅需十几秒;
  • 物理真实感强:皮肤、金属、布料质感逼真;
  • 导演级控制:镜头、节奏、风格均可调;
  • 开源+本地运行:隐私安全,无平台锁定。

⚠️ 局限:

  • 时长限制:目前最长 10 秒(官方平台支持 20 秒);
  • 音频偏“参考级”:适合氛围音效,暂不能替代专业配乐;
  • 显存要求高:4K 输出需 RTX 4090 级别 GPU;
  • 提示词敏感:模糊描述易“跑偏”,需精准表达。

🔗 如何体验?

  • 在线体验https://ltx.video/
  • ComfyUI 节点:模板库搜索 “LTX-2”
  • 支持平台:Fal、Replicate、RunDiffusion、ComfyUI
  • 开源计划:2025 年 11 月下旬开放模型权重与代码

🎥 写在最后

过去,我们说“AI 生成视频”是噱头;
现在,LTX-2 证明:AI 已能参与真正的创作流程

它或许还不够完美,但方向无比清晰——
让创意不再被技术门槛束缚,让想法秒变画面。

如果你也想亲手“导演”一段属于自己的 4K 短片,
现在,就是最好的时机。

打开 ComfyUI,输入你的第一句提示词,
世界,将为你动起来。

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