diff --git a/.memory/worklog.json b/.memory/worklog.json
index 85b703f..6d79137 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -279,6 +279,13 @@
       "message": "auto-save 2026-05-12 19:47 (~2)",
       "hash": "07766e0",
       "files_changed": 2
+    },
+    {
+      "ts": "2026-05-12T19:53:40+08:00",
+      "type": "commit",
+      "message": "auto-save 2026-05-12 19:53 (~2)",
+      "hash": "c481da4",
+      "files_changed": 2
     }
   ]
 }
diff --git a/web/app/page.tsx b/web/app/page.tsx
index add7fae..6c7b389 100644
--- a/web/app/page.tsx
+++ b/web/app/page.tsx
@@ -16,6 +16,7 @@ import { ThemeToggle } from "@/components/theme-toggle"
 import { Dashboard } from "@/components/dashboard"
 import { addManualFrame, analyzeJob, createJob, getJob, uploadJob, type Job } from "@/lib/api"
 import { FrameLightbox } from "@/components/lightbox"
+import { VideoLightbox } from "@/components/video-lightbox"
 
 const NODE_TYPES = {
   input: InputNode,
@@ -61,6 +62,7 @@ export default function Home() {
   const [analyzing, setAnalyzing] = useState(false)
   const [selectedFrames, setSelectedFrames] = useState<Set<number>>(new Set())
   const [expandedFrame, setExpandedFrame] = useState<number | null>(null)
+  const [videoLightboxOpen, setVideoLightboxOpen] = useState(false)
   const pollRef = useRef<ReturnType<typeof setInterval> | null>(null)
 
   const handleSubmit = useCallback(async (url: string) => {
@@ -181,6 +183,7 @@ export default function Home() {
     onToggleFrame: handleToggleFrame,
     onExpandFrame: setExpandedFrame,
     onAddManualFrame: handleAddManualFrame,
+    onOpenVideoLightbox: () => setVideoLightboxOpen(true),
   }), [job, submitting, analyzing, selectedFrames, handleSubmit, handleUpload, handleAnalyze, handleToggleFrame, handleAddManualFrame])
 
   // 用 useNodesState 让 ReactFlow 自己管位置（避免轮询时重置 drag）
@@ -275,6 +278,14 @@ export default function Home() {
             onToggleSelect={handleToggleFrame}
           />
         )}
+
+        {/* Video lightbox — InputNode 缩略图点击进入 */}
+        <VideoLightbox
+          jobId={job?.id ?? null}
+          open={videoLightboxOpen}
+          onClose={() => setVideoLightboxOpen(false)}
+          onAddFrame={handleAddManualFrame}
+        />
       </main>
     </>
   )
diff --git a/web/components/lightbox.tsx b/web/components/lightbox.tsx
index 8fc4dd0..d86ae62 100644
--- a/web/components/lightbox.tsx
+++ b/web/components/lightbox.tsx
@@ -1,7 +1,7 @@
 "use client"
 import { useEffect } from "react"
 import { X, ChevronLeft, ChevronRight, Check } from "lucide-react"
-import { frameUrl, type KeyFrame } from "@/lib/api"
+import { frameUrl, videoUrl, type KeyFrame } from "@/lib/api"
 
 interface Props {
   jobId: string
@@ -65,12 +65,19 @@ export function FrameLightbox({ jobId, frames, activeIndex, selected, onClose, o
         </button>
       )}
 
-      {/* 大图 */}
+      {/* 大视频 — 可拖时间轴播放（默认 seek 到该帧时间点） */}
       <div onClick={(e) => e.stopPropagation()} className="flex flex-col items-center gap-4 max-w-[92vw] max-h-[92vh]">
-        <img
-          src={frameUrl(jobId, f.index)}
-          alt={`frame ${f.index}`}
-          className="max-w-[88vw] max-h-[72vh] rounded-xl shadow-2xl object-contain"
+        <video
+          key={`${jobId}-${f.index}`}
+          src={videoUrl(jobId)}
+          controls
+          autoPlay
+          playsInline
+          preload="auto"
+          className="max-w-[88vw] max-h-[72vh] rounded-xl shadow-2xl bg-black"
+          onLoadedMetadata={(e) => {
+            (e.target as HTMLVideoElement).currentTime = f.timestamp
+          }}
         />
         <div className="flex items-center gap-4 text-white">
           <div className="font-mono text-sm tabular-nums">
diff --git a/web/components/nodes/index.tsx b/web/components/nodes/index.tsx
index 0a3a241..aa387c0 100644
--- a/web/components/nodes/index.tsx
+++ b/web/components/nodes/index.tsx
@@ -19,6 +19,7 @@ export interface NodeData {
   onToggleFrame: (idx: number) => void
   onExpandFrame: (idx: number) => void
   onAddManualFrame: (t: number) => void
+  onOpenVideoLightbox: () => void
 }
 
 /* ---- 状态映射工具 ---- */
@@ -76,6 +77,45 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
   const inputLocked = isDownloading || d.submitting
 
   return (
+    <div className="relative" style={{ width: 320 }}>
+      {/* 视频缩略图浮于节点上方 — hover 自动播放，点击进大 lightbox */}
+      {hasVideo && job && (
+        <div className="absolute left-0 right-0 flex justify-center" style={{ bottom: "calc(100% + 12px)" }}>
+          <button
+            type="button"
+            onClick={(e) => { e.stopPropagation(); d.onOpenVideoLightbox() }}
+            title="点击放大滑动播放"
+            className="group relative rounded-lg overflow-hidden border border-white/25 shadow-2xl hover:-translate-y-0.5 transition"
+            style={{ width: 220 }}
+          >
+            <video
+              src={videoUrl(job.id)}
+              muted
+              loop
+              playsInline
+              preload="metadata"
+              className="block w-full bg-black"
+              style={{ aspectRatio: `${job.width}/${job.height}`, maxHeight: 280 }}
+              onMouseEnter={(e) => {
+                const v = e.target as HTMLVideoElement
+                v.play().catch(() => {})
+              }}
+              onMouseLeave={(e) => {
+                const v = e.target as HTMLVideoElement
+                v.pause()
+                v.currentTime = 0
+              }}
+            />
+            <div className="absolute bottom-1.5 right-1.5 bg-black/70 text-white text-[10px] font-mono px-1.5 py-0.5 rounded">
+              {job.duration.toFixed(1)}s
+            </div>
+            <div className="pointer-events-none absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 bg-black/30 transition">
+              <span className="text-white text-[11px] bg-black/70 px-2 py-1 rounded">点击放大</span>
+            </div>
+          </button>
+        </div>
+      )}
+
     <NodeShell
       type="input" status={inputStatus(job)}
       icon={<Link2 className="h-4 w-4" />}
@@ -128,37 +168,10 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
         </>
       )}
 
-      {/* 已下载：视频播放器 + 加帧 + 元数据 + 解析按钮 */}
+      {/* 已下载：仅元数据（视频缩略图浮在节点上方，点击进 lightbox） */}
       {hasVideo && job && (
         <>
-          {/* 视频播放器（拖时间轴选帧） */}
-          <video
-            ref={videoRef}
-            src={videoUrl(job.id)}
-            controls
-            onTimeUpdate={(e) => setVideoT((e.target as HTMLVideoElement).currentTime)}
-            className="block w-full rounded-md bg-black border border-black/10 dark:border-white/10"
-          />
-          {/* 加帧按钮（已抽过帧才出现） */}
-          {hasFrames && (
-            <button
-              type="button"
-              disabled={addingFrame}
-              onClick={async (e) => {
-                e.stopPropagation()
-                const t = videoRef.current?.currentTime ?? videoT
-                setAddingFrame(true)
-                try { await d.onAddManualFrame(t) } finally { setAddingFrame(false) }
-              }}
-              className="mt-2 w-full text-[12px] py-1.5 rounded-md bg-emerald-500 hover:bg-emerald-400 text-white disabled:opacity-50 inline-flex items-center justify-center gap-1.5 font-medium"
-              title="把视频当前时间点抽为新关键帧"
-            >
-              {addingFrame ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Plus className="h-3.5 w-3.5" />}
-              {addingFrame ? "抽帧中…" : `+ 把 ${videoT.toFixed(1)}s 加为关键帧`}
-            </button>
-          )}
-          {/* 元数据 */}
-          <div className="mt-2 rounded-md bg-black/30 border border-black/10 dark:border-white/10 px-3 py-2 flex items-center justify-between text-[10.5px] font-mono">
+          <div className="rounded-md bg-black/30 border border-black/10 dark:border-white/10 px-3 py-2 flex items-center justify-between text-[10.5px] font-mono">
             <span className="text-[var(--text-strong)]">{job.width}×{job.height} · {job.duration.toFixed(1)}s</span>
             <span className="text-[var(--text-faint)]">{job.url.startsWith("upload://") ? "📎 上传" : "🔗 链接"}</span>
           </div>
@@ -182,6 +195,7 @@ export function InputNode({ data, selected }: NodeProps<{ data: NodeData }> | an
         </>
       )}
     </NodeShell>
+    </div>
   )
 }
 
@@ -286,7 +300,7 @@ export function KeyframeNode({ data, selected }: any) {
                   {f.timestamp.toFixed(1)}s
                 </div>
 
-                {/* Hover 大图预览 — 大尺寸（跟整排缩略图同宽 + 高至屏幕顶） */}
+                {/* Hover 视频片段预览 — 从该时间点静音 loop 播放 */}
                 <div
                   className="pointer-events-none absolute opacity-0 group-hover:opacity-100 scale-95 group-hover:scale-100 transition-all duration-200 z-[60]"
                   style={{
@@ -297,9 +311,13 @@ export function KeyframeNode({ data, selected }: any) {
                   }}
                 >
                   <div className="rounded-2xl overflow-hidden border border-white/25 bg-black" style={{ boxShadow: "0 40px 100px -20px rgba(0,0,0,0.85), 0 0 0 1px rgba(255,255,255,0.06)" }}>
-                    <img
-                      src={frameUrl(jobId, f.index)}
-                      alt={`preview ${f.index}`}
+                    <video
+                      src={`${process.env.NEXT_PUBLIC_API_BASE ?? "http://localhost:4291"}/jobs/${jobId}/video.mp4#t=${f.timestamp}`}
+                      muted
+                      loop
+                      autoPlay
+                      playsInline
+                      preload="metadata"
                       className="block"
                       style={{
                         width: KEYFRAME_WIDTH * 2,
@@ -308,10 +326,15 @@ export function KeyframeNode({ data, selected }: any) {
                         maxHeight: "82vh",
                         objectFit: "contain",
                       }}
+                      onLoadedMetadata={(e) => {
+                        const v = e.target as HTMLVideoElement
+                        v.currentTime = f.timestamp
+                        v.play().catch(() => {})
+                      }}
                     />
                     <div className="flex items-center justify-between px-3 py-2 bg-black/70 backdrop-blur-md">
-                      <span className="text-white text-[12.5px] font-medium">分镜 {f.index + 1}</span>
-                      <span className="text-white/60 text-[11px] font-mono">{f.timestamp.toFixed(2)}s</span>
+                      <span className="text-white text-[12.5px] font-medium">分镜 {f.index + 1} · 自动播放</span>
+                      <span className="text-white/60 text-[11px] font-mono">从 {f.timestamp.toFixed(2)}s</span>
                     </div>
                   </div>
                 </div>
diff --git a/web/components/video-lightbox.tsx b/web/components/video-lightbox.tsx
new file mode 100644
index 0000000..d09bf04
--- /dev/null
+++ b/web/components/video-lightbox.tsx
@@ -0,0 +1,74 @@
+"use client"
+import { useEffect, useRef, useState } from "react"
+import { X, Plus, Loader2 } from "lucide-react"
+import { videoUrl } from "@/lib/api"
+
+interface Props {
+  jobId: string | null
+  open: boolean
+  onClose: () => void
+  onAddFrame: (t: number) => Promise<void>
+}
+
+export function VideoLightbox({ jobId, open, onClose, onAddFrame }: Props) {
+  const videoRef = useRef<HTMLVideoElement>(null)
+  const [currentT, setCurrentT] = useState(0)
+  const [adding, setAdding] = useState(false)
+
+  useEffect(() => {
+    if (!open) return
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape") onClose()
+    }
+    window.addEventListener("keydown", onKey)
+    return () => window.removeEventListener("keydown", onKey)
+  }, [open, onClose])
+
+  if (!open || !jobId) return null
+
+  return (
+    <div
+      className="fixed inset-0 z-[100] bg-black/85 backdrop-blur-sm flex items-center justify-center"
+      onClick={onClose}
+    >
+      <button
+        onClick={(e) => { e.stopPropagation(); onClose() }}
+        className="absolute top-5 right-5 h-10 w-10 rounded-full bg-white/10 hover:bg-white/20 text-white flex items-center justify-center"
+        aria-label="关闭"
+      >
+        <X className="h-5 w-5" />
+      </button>
+
+      <div onClick={(e) => e.stopPropagation()} className="flex flex-col items-center gap-4 max-w-[92vw] max-h-[92vh]">
+        <video
+          ref={videoRef}
+          src={videoUrl(jobId)}
+          controls
+          autoPlay
+          playsInline
+          preload="auto"
+          onTimeUpdate={(e) => setCurrentT((e.target as HTMLVideoElement).currentTime)}
+          className="max-w-[88vw] max-h-[72vh] rounded-xl shadow-2xl bg-black"
+        />
+        <div className="flex items-center gap-4 text-white">
+          <div className="font-mono text-sm tabular-nums text-white/80">
+            当前 {currentT.toFixed(2)}s
+          </div>
+          <button
+            disabled={adding}
+            onClick={async () => {
+              const t = videoRef.current?.currentTime ?? currentT
+              setAdding(true)
+              try { await onAddFrame(t) } finally { setAdding(false) }
+            }}
+            className="px-5 py-2 rounded-lg text-sm font-medium inline-flex items-center gap-2 bg-emerald-500 hover:bg-emerald-400 text-white disabled:opacity-50 transition"
+          >
+            {adding ? <Loader2 className="h-4 w-4 animate-spin" /> : <Plus className="h-4 w-4" />}
+            {adding ? "抽帧中…" : `+ 把 ${currentT.toFixed(1)}s 加为关键帧`}
+          </button>
+        </div>
+        <div className="text-[11px] text-white/40 font-mono">拖动时间轴选帧 · 点 + 加为关键帧 · ESC 关闭</div>
+      </div>
+    </div>
+  )
+}