v0.2.1 — 主体闸门 / 偏色闸门：修复两起「看着像成品、实际是废片」的事故

这次修的是两起真实交付翻车（用户实拍素材复现）

1. 视频抠像把主体抠没了（成片全白只剩字幕）

• 根因：默认后端 RVM 是人像视频抠像模型。产品素材上 pha 最大 0.29、>0.5 覆盖率 0.0000；同帧 rembg isnet-general-use 覆盖率 37.97%。
• 修复：默认改 rembg 逐帧通用抠像；RVM 降为 --backend rvm（仅画面有人时用）。
• 新增闸门：主体存在性 —— 覆盖率低于 --min-subject（默认 0.5%）时第 20 帧熔断、删除产物、\status: rejected\、退出码 2，绝不交付空视频。
• 实测：覆盖率 0.409（修复前 0.0000）。

2. 光效把整片染粉 + 漂移的「幽灵」亮斑

• 根因：① \�lend=screen\ 跑在 yuv420p 上混 UV 平面 → 品红；② \leak\ 用全画面线性渐变（端点 \

v0.2.0 — 视频特效：抠像换背景 · 动效文字 · 转场 · 光效

Adds four video effect capability groups, all verified with the end-to-end selftest (26/26).

• video-matte: AI subject matting (RVM ONNX, auto-downloaded) with background replacement, transparent WebM or matte output, plus a chroma-key path for green screen. Measured 81 fps at 568x320 and 17 fps at 720x1280 on CPU.
• video-text-anim: animated titles generated as standard ASS (fade, four-direction slides, typewriter, pop, bounce, karaoke word highlight, lower-third).
• video-join: all 53 xfade transitions enumerated from the bundled ffmpeg, plus stylized presets flash / glitch / whip-pan / soft-zoom / film-burn.
• video-fx: 13 glow, bloom, leak, trail, grain, vignette, sharpen and grading presets, chainable, with external LUT support and before/after comparison frames.

Still out of scope (needs After Effects): motion tracking, 3D camera moves, particle systems, rotoscoping.

v0.1.0

First public release of dsh-creative-studio.

Skills: image-studio (matting with quality tiers, inpainting retouch, text/logo compositing, batch platform-size exports, image QA) and video-studio (footage inventory, accurate cutting, transition joins, on-screen text, subtitle burn-in, music mixing, smart cover frames, platform-spec exports).

The Python runtime (Pillow, OpenCV, rembg, ONNX Runtime, imageio-ffmpeg) is not bundled; run scripts/bootstrap.ps1 once per machine, then scripts/install-as-plugin.ps1 to register the plugin.