--- a/content/html/content/public/HTMLMediaElement.h
+++ b/content/html/content/public/HTMLMediaElement.h
@@ -1008,16 +1008,19 @@ protected:
   // These events get re-dispatched when the bfcache is exited.
   nsTArray<nsString> mPendingEvents;
 
   // Media loading flags. See:
   //   http://www.whatwg.org/specs/web-apps/current-work/#video)
   nsMediaNetworkState mNetworkState;
   nsMediaReadyState mReadyState;
 
+  // Last value passed from codec or stream source to UpdateReadyStateForData.
+  NextFrameStatus mLastNextFrameStatus;
+
   enum LoadAlgorithmState {
     // No load algorithm instance is waiting for a source to be added to the
     // media in order to continue loading.
     NOT_WAITING,
     // We've run the load algorithm, and we tried all source children of the
     // media element, and failed to load any successfully. We're waiting for
     // another source element to be added to the media element, and will try
     // to load any such element when its added.

--- a/content/html/content/src/HTMLMediaElement.cpp
+++ b/content/html/content/src/HTMLMediaElement.cpp
@@ -66,16 +66,18 @@
 #include "nsURIHashKey.h"
 #include "nsJSUtils.h"
 #include "MediaStreamGraph.h"
 #include "nsIScriptError.h"
 #include "nsHostObjectProtocolHandler.h"
 #include "mozilla/dom/MediaSource.h"
 #include "MediaMetadataManager.h"
 #include "MediaSourceDecoder.h"
+#include "AudioStreamTrack.h"
+#include "VideoStreamTrack.h"
 
 #include "AudioChannelService.h"
 
 #include "mozilla/dom/power/PowerManagerService.h"
 #include "mozilla/dom/WakeLock.h"
 
 #include "mozilla/dom/AudioTrack.h"
 #include "mozilla/dom/AudioTrackList.h"
@@ -659,17 +661,20 @@ void HTMLMediaElement::AbortExistingLoad
   mLoadedDataFired = false;
   mAutoplaying = true;
   mIsLoadingFromSourceChildren = false;
   mSuspendedAfterFirstFrame = false;
   mAllowSuspendAfterFirstFrame = true;
   mHaveQueuedSelectResource = false;
   mSuspendedForPreloadNone = false;
   mDownloadSuspendedByCache = false;
+  mHasAudio = false;
+  mHasVideo = false;
   mSourcePointer = nullptr;
+  mLastNextFrameStatus = NEXT_FRAME_UNINITIALIZED;
 
   mTags = nullptr;
 
   if (mNetworkState != nsIDOMHTMLMediaElement::NETWORK_EMPTY) {
     NS_ASSERTION(!mDecoder && !mSrcStream, "How did someone setup a new stream/decoder already?");
     ChangeNetworkState(nsIDOMHTMLMediaElement::NETWORK_EMPTY);
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_NOTHING);
     mPaused = true;
@@ -1982,16 +1987,17 @@ HTMLMediaElement::LookupMediaElementURIT
 }
 
 HTMLMediaElement::HTMLMediaElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
   : nsGenericHTMLElement(aNodeInfo),
     mSrcStreamListener(nullptr),
     mCurrentLoadID(0),
     mNetworkState(nsIDOMHTMLMediaElement::NETWORK_EMPTY),
     mReadyState(nsIDOMHTMLMediaElement::HAVE_NOTHING),
+    mLastNextFrameStatus(NEXT_FRAME_UNINITIALIZED),
     mLoadWaitStatus(NOT_WAITING),
     mVolume(1.0),
     mPreloadAction(PRELOAD_UNDEFINED),
     mMediaSize(-1,-1),
     mLastCurrentTime(0.0),
     mFragmentStart(-1.0),
     mFragmentEnd(-1.0),
     mDefaultPlaybackRate(1.0),
@@ -2823,32 +2829,43 @@ void HTMLMediaElement::SetupSrcMediaStre
   mSrcStreamListener = new StreamListener(this);
   GetSrcMediaStream()->AddListener(mSrcStreamListener);
   if (mPaused) {
     GetSrcMediaStream()->ChangeExplicitBlockerCount(1);
   }
   if (mPausedForInactiveDocumentOrChannel) {
     GetSrcMediaStream()->ChangeExplicitBlockerCount(1);
   }
+
+  nsAutoTArray<nsRefPtr<AudioStreamTrack>,1> audioTracks;
+  aStream->GetAudioTracks(audioTracks);
+  nsAutoTArray<nsRefPtr<VideoStreamTrack>,1> videoTracks;
+  aStream->GetVideoTracks(videoTracks);
+
+  // Clear aTags, but set mHasAudio and mHasVideo
+  MediaInfo mediaInfo;
+  mediaInfo.mAudio.mHasAudio = !audioTracks.IsEmpty();
+  mediaInfo.mVideo.mHasVideo = !videoTracks.IsEmpty();
+  MetadataLoaded(&mediaInfo, nullptr);
+
+  DispatchAsyncEvent(NS_LITERAL_STRING("suspend"));
+  mNetworkState = nsIDOMHTMLMediaElement::NETWORK_IDLE;
+
   ChangeDelayLoadStatus(false);
   GetSrcMediaStream()->AddAudioOutput(this);
   GetSrcMediaStream()->SetAudioOutputVolume(this, float(mMuted ? 0.0 : mVolume));
   VideoFrameContainer* container = GetVideoFrameContainer();
   if (container) {
     GetSrcMediaStream()->AddVideoOutput(container);
   }
 
   // Note: we must call DisconnectTrackListListeners(...)  before dropping
   // mSrcStream
   mSrcStream->ConstructMediaTracks(AudioTracks(), VideoTracks());
 
-  ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_METADATA);
-  DispatchAsyncEvent(NS_LITERAL_STRING("durationchange"));
-  DispatchAsyncEvent(NS_LITERAL_STRING("loadedmetadata"));
-  ChangeNetworkState(nsIDOMHTMLMediaElement::NETWORK_IDLE);
   AddRemoveSelfReference();
   // FirstFrameLoaded() will be called when the stream has current data.
 }
 
 void HTMLMediaElement::EndSrcMediaStreamPlayback()
 {
   MediaStream* stream = GetSrcMediaStream();
   if (stream) {
@@ -2918,16 +2935,17 @@ void HTMLMediaElement::MetadataLoaded(co
   }
 }
 
 void HTMLMediaElement::FirstFrameLoaded()
 {
   NS_ASSERTION(!mSuspendedAfterFirstFrame, "Should not have already suspended");
 
   ChangeDelayLoadStatus(false);
+  UpdateReadyStateForData(NEXT_FRAME_UNAVAILABLE);
 
   if (mDecoder && mAllowSuspendAfterFirstFrame && mPaused &&
       !HasAttr(kNameSpaceID_None, nsGkAtoms::autoplay) &&
       mPreloadAction == HTMLMediaElement::PRELOAD_METADATA) {
     mSuspendedAfterFirstFrame = true;
     mDecoder->Suspend();
   }
 }
@@ -3080,16 +3098,18 @@ void HTMLMediaElement::DownloadStalled()
 
 bool HTMLMediaElement::ShouldCheckAllowOrigin()
 {
   return mCORSMode != CORS_NONE;
 }
 
 void HTMLMediaElement::UpdateReadyStateForData(MediaDecoderOwner::NextFrameStatus aNextFrame)
 {
+  mLastNextFrameStatus = aNextFrame;
+
   if (mReadyState < nsIDOMHTMLMediaElement::HAVE_METADATA) {
     // aNextFrame might have a next frame because the decoder can advance
     // on its own thread before MetadataLoaded gets a chance to run.
     // The arrival of more data can't change us out of this readyState.
     return;
   }
 
   if (aNextFrame == MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE_SEEKING) {
@@ -3106,16 +3126,24 @@ void HTMLMediaElement::UpdateReadyStateF
     // this transition if the decoder is in ended state; the readyState
     // should remain at HAVE_CURRENT_DATA in this case.
     // Note that this state transition includes the case where we finished
     // downloaded the whole data stream.
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_ENOUGH_DATA);
     return;
   }
 
+  if (mReadyState < nsIDOMHTMLMediaElement::HAVE_CURRENT_DATA && mHasVideo) {
+    VideoFrameContainer* container = GetVideoFrameContainer();
+    if (container && mMediaSize == nsIntSize(-1,-1)) {
+      // No frame has been set yet. Don't advance.
+      return;
+    }
+  }
+
   if (aNextFrame != MediaDecoderOwner::NEXT_FRAME_AVAILABLE) {
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_CURRENT_DATA);
     if (!mWaitingFired && aNextFrame == MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE_BUFFERING) {
       FireTimeUpdate(false);
       DispatchAsyncEvent(NS_LITERAL_STRING("waiting"));
       mWaitingFired = true;
     }
     return;
@@ -3282,34 +3310,24 @@ void HTMLMediaElement::CheckAutoplayData
       GetSrcMediaStream()->ChangeExplicitBlockerCount(-1);
     }
     DispatchAsyncEvent(NS_LITERAL_STRING("play"));
   }
 }
 
 VideoFrameContainer* HTMLMediaElement::GetVideoFrameContainer()
 {
-  // If we have loaded the metadata, and the size of the video is still
-  // (-1, -1), the media has no video. Don't go a create a video frame
-  // container.
-  if (mReadyState >= nsIDOMHTMLMediaElement::HAVE_METADATA &&
-      mMediaSize == nsIntSize(-1, -1)) {
-    return nullptr;
-  }
+  if (mVideoFrameContainer)
+    return mVideoFrameContainer;
 
   // Only video frames need an image container.
   if (!IsVideo()) {
     return nullptr;
   }
 
-  mHasVideo = true;
-
-  if (mVideoFrameContainer)
-    return mVideoFrameContainer;
-
   mVideoFrameContainer =
     new VideoFrameContainer(this, LayerManager::CreateAsynchronousImageContainer());
 
   return mVideoFrameContainer;
 }
 
 nsresult HTMLMediaElement::DispatchEvent(const nsAString& aName)
 {
@@ -3407,16 +3425,17 @@ void HTMLMediaElement::NotifyDecoderPrin
     OutputMediaStream* ms = &mOutputStreams[i];
     ms->mStream->CombineWithPrincipal(principal);
   }
 }
 
 void HTMLMediaElement::UpdateMediaSize(nsIntSize size)
 {
   mMediaSize = size;
+  UpdateReadyStateForData(mLastNextFrameStatus);
 }
 
 void HTMLMediaElement::SuspendOrResumeElement(bool aPauseElement, bool aSuspendEvents)
 {
   if (aPauseElement != mPausedForInactiveDocumentOrChannel) {
     mPausedForInactiveDocumentOrChannel = aPauseElement;
     if (aPauseElement) {
 #ifdef MOZ_EME