diff --git a/src/components/CameraGuide.vue b/src/components/CameraGuide.vue
index 4fb34f30..7f09f246 100644
--- a/src/components/CameraGuide.vue
+++ b/src/components/CameraGuide.vue
@@ -192,6 +192,8 @@ export default {
           return
         }
         this.activeStream = stream
+        console.log('[CameraGuide] stream acquired, 来源:', this.stream ? '父组件复用' : '组件自申请', 'active:', stream.active,
+          'tracks:', stream.getTracks().map(t => `${t.kind}/${t.readyState}/enabled:${t.enabled}`))
         await this.$nextTick()
         const video = this.$refs.video
         if (video) {
@@ -200,14 +202,37 @@ export default {
           video.setAttribute('playsinline', 'true')
           video.setAttribute('webkit-playsinline', 'true')
           video.srcObject = stream
+          const logVideoState = (tag) => {
+            console.log(`[CameraGuide] ${tag}:`,
+              'paused:', video.paused,
+              'readyState:', video.readyState,
+              'currentTime:', video.currentTime,
+              'videoWidth:', video.videoWidth,
+              'videoHeight:', video.videoHeight,
+              'streamActive:', stream.active,
+              'muted:', video.muted)
+          }
           const playVideo = () => {
-            video.play().catch(e => console.warn('video play error:', e && (e.name || e.message || e)))
+            video.play()
+              .then(() => logVideoState('play resolved'))
+              .catch(e => {
+                console.warn('[CameraGuide] video play error:', e && (e.name || e.message || e))
+                logVideoState('play rejected')
+              })
+          }
+          video.onloadedmetadata = () => {
+            logVideoState('loadedmetadata')
+            playVideo()
+          }
+          video.onplaying = () => logVideoState('playing')
+          video.onerror = () => {
+            console.warn('[CameraGuide] video element error:', video.error && `${video.error.code}/${video.error.message}`)
           }
           if (video.readyState >= 1) {
             playVideo()
-          } else {
-            video.onloadedmetadata = playVideo
           }
+          // 2 秒后再看一次：currentTime 是否增长（判断是真在播还是黑屏死流）
+          setTimeout(() => logVideoState('after 2s'), 2000)
         }
       } catch (e) {
         // 权限拒绝或相机不可用 → 通知父组件降级为系统选择器