[roadmap] Q4 2026 Canvas and timeline: editing, UI and output parity / 画布与时间线功能和UI #262

Parent roadmap: #107. November–December 2026 targets; owners and capacity remain to be confirmed.

Goal and scope / 目标与范围

Deliver the editing and UI capabilities needed for reference-MV and product-film creation, with reliable save/reopen and preview/export parity. Verify and strengthen existing capabilities rather than treating every tracked feature as unimplemented.

围绕参考MV和商品短片补齐功能与UI，形成素材组织、编辑、时间线、导出和重开闭环；现有能力先核验加固，不重复作为从零新增。

Work and milestones / 工作与里程碑

• By November 30 · P0: deliver editing essentials for the first reference-video film. Address large-project responsiveness, repeated undo/redo, reference prechecks, first/last-frame roles, asset provenance and archive round trips. Preserve focus, selection and uncommitted drafts during background updates.

• By November 30 · P0: support the prompt optimization, candidate review/adoption and shot/timeline operations actually required by that film. Distinguish replacing source content from switching adopted results. Use shared commands and readable disabled/error states.

• First half of December · P0/P1: complete caption/text acceptance and prioritize transitions, multiple visual tracks, position/scale/opacity keyframes and audio fades by demonstrated creation needs. Each feature needs an editable document, UI, Agent operation, preview and export.

• By December 31 · P1: complete Director Stage creation, external character/scene import with motion binding, and publication as project assets. Build selected director-toolbox actions from working contracts. Depth-to-character motion requires its own validation; depth frames alone do not establish skeletal motion capture.

• Advanced editing must not block the November first-film milestone unless that scenario actually requires it.

• **11月底 · P0：**交付首条参考视频成片必需编辑能力，治理大工程性能、反复撤销/重做、引用预检、首尾帧、来源和归档往返；后台更新保留焦点、选中与草稿。

• **11月底 · P0：**补齐该场景必要的提示词优化、候选检查/采用和镜头编排；区分替换本体与切换采用结果，操作走共用命令，禁用和失败原因可读。

• **12月上半月 · P0/P1：**完成字幕文字验收；按真实需要依次推进转场、多视觉轨、位置/缩放/不透明度关键帧和音频淡化，均提供可编辑结构、UI、Agent入口、预览及导出。

• **12月底 · P1：**打通导演台创建、角色/场景导入与动作绑定、素材发布，再形成必要导演工具箱动作；深度驱动角色单独验证，不能以逐帧深度代替骨骼动作能力。

• 除非首条成片确实需要，高级能力不作为11月交付前置条件。

Implementation and dependencies / 实现影响与依赖

Use shared commands, asset registration and editing documents. Related implementation: #153, #154, #87, #241, #256, #117, #122, #121 and the supplemental requirements in #107. Coordinate actual generation capabilities with providers; provide required operations to the Agent roadmap.

沿用共享命令、素材登记和编辑文档，已有 Issue 继续承接；provider提供真实生成能力，Agent复用本领域操作。

Acceptance / 验收标准

• Matched before/after measurements on the same representative large project and environment; repeated history operations and background completion preserve state. / 同规模同环境测量，历史操作与后台完成不丢数据。
• Delivered operations have equivalent UI/Agent entry points and complete zh-CN/en-US interactions. / 双入口及中英文完整。
• Save/reopen and editable archive round trips preserve assets, fonts, timing and relationships. / 保存重开及归档往返保留素材、字体、时序和关系。
• Real MP4 output matches preview in pictures, captions, audio and timing. / 真实MP4画面字幕音频时序与预览一致。
• Director Stage output becomes a registered project asset usable on the timeline. / 导演台结果登记为可被时间线引用的项目素材。