diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index b543d9d..3b2784b 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -50,6 +50,8 @@
       mSyncQueues(false),
       mPaused(false),
       mVideoRenderingStarted(false),
+      mVideoRenderingStartGeneration(0),
+      mAudioRenderingStartGeneration(0),
       mLastPositionUpdateUs(-1ll),
       mVideoLateByUs(0ll) {
 }
@@ -220,6 +222,23 @@
     (new AMessage(kWhatAudioSinkChanged, id()))->post();
 }
 
+void NuPlayer::Renderer::prepareForMediaRenderingStart() {
+    mAudioRenderingStartGeneration = mAudioQueueGeneration;
+    mVideoRenderingStartGeneration = mVideoQueueGeneration;
+}
+
+void NuPlayer::Renderer::notifyIfMediaRenderingStarted() {
+    if (mVideoRenderingStartGeneration == mVideoQueueGeneration &&
+        mAudioRenderingStartGeneration == mAudioQueueGeneration) {
+        mVideoRenderingStartGeneration = -1;
+        mAudioRenderingStartGeneration = -1;
+
+        sp<AMessage> notify = mNotify->dup();
+        notify->setInt32("what", kWhatMediaRenderingStart);
+        notify->post();
+    }
+}
+
 bool NuPlayer::Renderer::onDrainAudioQueue() {
     uint32_t numFramesPlayed;
     if (mAudioSink->getPosition(&numFramesPlayed) != OK) {
@@ -299,6 +318,8 @@
         numBytesAvailableToWrite -= copy;
         size_t copiedFrames = copy / mAudioSink->frameSize();
         mNumFramesWritten += copiedFrames;
+
+        notifyIfMediaRenderingStarted();
     }
 
     notifyPosition();
@@ -405,6 +426,8 @@
         notifyVideoRenderingStart();
     }
 
+    notifyIfMediaRenderingStarted();
+
     notifyPosition();
 }
 
@@ -552,6 +575,7 @@
     // is flushed.
     syncQueuesDone();
 
+    ALOGV("flushing %s", audio ? "audio" : "video");
     if (audio) {
         flushQueue(&mAudioQueue);
 
@@ -560,6 +584,8 @@
 
         mDrainAudioQueuePending = false;
         ++mAudioQueueGeneration;
+
+        prepareForMediaRenderingStart();
     } else {
         flushQueue(&mVideoQueue);
 
@@ -568,6 +594,8 @@
 
         mDrainVideoQueuePending = false;
         ++mVideoQueueGeneration;
+
+        prepareForMediaRenderingStart();
     }
 
     notifyFlushComplete(audio);
@@ -658,6 +686,8 @@
     mDrainVideoQueuePending = false;
     ++mVideoQueueGeneration;
 
+    prepareForMediaRenderingStart();
+
     if (mHasAudio) {
         mAudioSink->pause();
     }