diff --git a/Sources/PlayerBridge.swift b/Sources/PlayerBridge.swift
index 78ad951..180982a 100644
--- a/Sources/PlayerBridge.swift
+++ b/Sources/PlayerBridge.swift
@@ -186,6 +186,9 @@ final class PlayerBridge: ObservableObject {
         let output = AVPlayerItemVideoOutput(pixelBufferAttributes: pixelBufferAttributes)
         playerItem.add(output)
         videoOutput = output
+        
+        // 预装音频 Tap（在播放前设置 audioMix，避免播放中设置导致视频卡顿）
+        screenRecorder.installAudioTap(on: playerItem)
         #endif
         
         player.replaceCurrentItem(with: playerItem)
diff --git a/Sources/PlayerRecorder.swift b/Sources/PlayerRecorder.swift
index e24f747..7733f04 100644
--- a/Sources/PlayerRecorder.swift
+++ b/Sources/PlayerRecorder.swift
@@ -319,7 +319,8 @@ final class PlayerRecorder: NSObject {
     // MARK: - Audio Tap Setup
     
     /// 安装音频 Tap（使用 playerItem.tracks 获取轨道，支持 HLS 虚拟 asset）
-    private func installAudioTap(on playerItem: AVPlayerItem) {
+    /// 应在 playerItem 开始播放前调用（playIndex 中），避免播放中设置 audioMix 导致视频卡顿
+    func installAudioTap(on playerItem: AVPlayerItem) {
         // 确保全局上下文存在
         if gTapContext == nil {
             gTapContext = AudioTapContext()
@@ -344,10 +345,8 @@ final class PlayerRecorder: NSObject {
             }
         }
         
-        guard audioTrackID != kCMPersistentTrackID_Invalid else {
-            print("[Recorder:DIAG] ⚠️ No enabled audio track in playerItem.tracks!")
-            writeDiagLog("No audio track in playerItem.tracks (count=\(itemTracks.count))")
-            return
+        if audioTrackID == kCMPersistentTrackID_Invalid {
+            print("[Recorder:DIAG] ⚠️ No enabled audio track found yet (tracks=\(itemTracks.count)), using wildcard")
         }
         
         print("[Recorder:DIAG] Using audio trackID=\(audioTrackID)")
@@ -431,8 +430,12 @@ final class PlayerRecorder: NSObject {
         isRunning = false
         recordStartTime = startTime
         
-        // 安装音频 Tap（录制时 asset 已加载，同步获取 track）
-        installAudioTap(on: playerItem)
+        // 安装音频 Tap（如果 playIndex 中已预装，则跳过）
+        if playerItem.audioMix == nil {
+            installAudioTap(on: playerItem)
+        } else {
+            print("[Recorder:DIAG] audioMix already installed, skipping")
+        }
         
         let tempFilename = "temp_recording_\(Int(Date().timeIntervalSince1970)).mp4"
         let url = saveDirectory.appendingPathComponent(tempFilename)