字节跳动 Seedance 2.5 发布：30 秒一镜到底，AI 视频开始会讲故事了

蛙知AI测评 发表于 2026-7-31 22:26:01

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<div class="ce-paragraph cdx-block ce-paragraph--left">  字节跳动正式发布 Seedance 2.5 视频生成模型，将单次视频生成时长从 15 秒翻倍提升至 30 秒。该模型将陆续上线即梦 AI 与豆包专业版，API 服务也将于近期接入火山方舟，面向影视、广告、教育、工业制造乃至自动驾驶等多场景开放。</div>
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<div class="ce-paragraph cdx-block ce-paragraph--left">官方称，Seedance 2.5 延续了统一的多模态音视频联合生成架构，核心突破在于长叙事能力、多模态参考和编辑能力的全面提升。简单来说，AI 视频不再只是生成一个零散片段，而是可以完成一段有起承转合的完整创作。</div>
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<div class="ce-paragraph cdx-block ce-paragraph--left"><b>30 秒内组织多镜头叙事，多轮延长保持一致</b></div>
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<div class="ce-paragraph cdx-block ce-paragraph--left">在官方展示的示例中，一段歌手一镜到底登台演出的片段完整呈现了叙事逻辑：镜头从红色幕布缝隙推进至暖色后台化妆间，年轻女歌手整理耳机，工作人员提醒登台，随后她穿过通道与舞伴互动、接过麦克风，最终登上舞台——镜头拉远至体育馆全景，观众、灯牌、荧光棒和欢呼声尽收眼底。模型可在 30 秒内组织铺垫、推进、转折、收尾等多个逻辑关联的镜头。</div>
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<div class="ce-paragraph cdx-block ce-paragraph--left">多轮延长能力同样惊艳——模型可在已有视频基础上继续生成 30 秒，并保持人物主体、场景、画面风格乃至声音和音效的一致性。官方示例中小男孩抱着足球跑出地铁车厢、男主追赶并最终抓住小男孩的连续动作一气呵成，毫无跳脱感。</div>
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<div class="ce-paragraph cdx-block ce-paragraph--left"><b>30 张图、10 段视频一起投喂，群像叙事无压力</b></div>
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<div class="ce-paragraph cdx-block ce-paragraph--left">Seedance 2.5 支持用户单次输入最多 30 张图片、10 段视频、10 段音频作为参考素材。模型可综合理解不同素材中的构图、场景、风格、人物和道具等元素，并按指令精准用于视频生成。在多人同框场景中，它还能同时还原多人形象与声音并保持主体稳定——官方展示的 30 秒音乐会片段采用 16 比 9 横屏、电影感写实风格，参考素材覆盖钢琴家、大提琴、小提琴、主唱、管弦乐队、合唱团和观众席。当 AI 视频从"<span class="spamTxt">特效</span>玩具"进化到能驾驭完整叙事和群像调度，短视频创作的工具箱恐怕又要重写一回了。</div>
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字节跳动 Seedance 2.5 发布：30 秒一镜到底，AI 视频开始会讲故事了