fix: filter stale timeupdate events by tracking sceneVideo element

engine/core/VideoManager.ts

@@ -11,6 +11,7 @@ export class VideoManager {
   private currentSrc = ''
   private preloaded: Map<'A' | 'B', string> = new Map()
   private switching = false
+  private sceneVideo: HTMLVideoElement | null = null
 
   private get active(): HTMLVideoElement {
     return this.activeSlot === 'A' ? this.elA! : this.elB!
@@ -27,6 +28,7 @@ export class VideoManager {
   attach(elA: HTMLVideoElement, elB: HTMLVideoElement) {
     this.elA = elA
     this.elB = elB
+    this.sceneVideo = elA
     for (const el of [elA, elB]) {
       el.addEventListener('ended', this.handleEnded)
       el.addEventListener('timeupdate', this.handleTimeUpdate)
@@ -41,6 +43,7 @@ export class VideoManager {
   }
 
   detach() {
+    this.sceneVideo = null
     for (const el of [this.elA, this.elB]) {
       if (!el) continue
       el.removeEventListener('ended', this.handleEnded)
@@ -55,6 +58,7 @@ export class VideoManager {
 
   playInitial(src: string, preloadUrls: string[]) {
     if (!this.elA) return
+    this.sceneVideo = this.elA
     this.currentSrc = src
     this.activeSlot = 'A'
     this.preloaded.set('A', src)
@@ -88,10 +92,12 @@ export class VideoManager {
     const alreadyPreloaded = this.preloaded.get(inKey)
 
     if (alreadyPreloaded === src) {
+      this.sceneVideo = this.inactive
       this.doCrossFade(src, preloadUrls)
     } else {
       this.preloaded.set(inKey, src)
       this.inactive.src = src
+      this.sceneVideo = this.inactive
       this.waitReady(this.inactive).then(() => {
         this.doCrossFade(src, preloadUrls)
       })
@@ -169,10 +175,9 @@ export class VideoManager {
     this.onEndCallback?.()
   }
 
-  private handleTimeUpdate = () => {
-    if (this.active) {
-      const t = this.active.currentTime
-      this.onTimeCallbacks.forEach((cb) => cb(t))
-    }
+  private handleTimeUpdate = (e: Event) => {
+    const el = e.target as HTMLVideoElement
+    if (!this.sceneVideo || el !== this.sceneVideo) return
+    this.onTimeCallbacks.forEach((cb) => cb(el.currentTime))
   }
 }