diff --git a/dom/media/ipc/PRemoteDecoderManager.ipdl b/dom/media/ipc/PRemoteDecoderManager.ipdl
index a538ba93e9fb..b955e5edf81b 100644
--- a/dom/media/ipc/PRemoteDecoderManager.ipdl
+++ b/dom/media/ipc/PRemoteDecoderManager.ipdl
@@ -46,7 +46,8 @@ parent:
 #endif
   async PRemoteDecoder(RemoteDecoderInfoIPDL info,
                        OptionSet options,
-                       TextureFactoryIdentifier? identifier);
+                       TextureFactoryIdentifier? identifier,
+                       uint64_t? mediaEngineId);
 
   sync Readback(SurfaceDescriptorGPUVideo sd) returns (SurfaceDescriptor aResult);
 
diff --git a/dom/media/ipc/RemoteAudioDecoder.cpp b/dom/media/ipc/RemoteAudioDecoder.cpp
index 7b085e208a2d..9e8ee2ebb736 100644
--- a/dom/media/ipc/RemoteAudioDecoder.cpp
+++ b/dom/media/ipc/RemoteAudioDecoder.cpp
@@ -39,8 +39,8 @@ MediaResult RemoteAudioDecoderChild::ProcessOutput(
 }
 
 MediaResult RemoteAudioDecoderChild::InitIPDL(
-    const AudioInfo& aAudioInfo,
-    const CreateDecoderParams::OptionSet& aOptions) {
+    const AudioInfo& aAudioInfo, const CreateDecoderParams::OptionSet& aOptions,
+    const Maybe<uint64_t>& aMediaEngineId) {
   RefPtr<RemoteDecoderManagerChild> manager =
       RemoteDecoderManagerChild::GetSingleton(mLocation);
 
@@ -59,21 +59,24 @@ MediaResult RemoteAudioDecoderChild::InitIPDL(
 
   mIPDLSelfRef = this;
   Unused << manager->SendPRemoteDecoderConstructor(this, aAudioInfo, aOptions,
-                                                   Nothing());
+                                                   Nothing(), aMediaEngineId);
   return NS_OK;
 }
 
 RemoteAudioDecoderParent::RemoteAudioDecoderParent(
     RemoteDecoderManagerParent* aParent, const AudioInfo& aAudioInfo,
     const CreateDecoderParams::OptionSet& aOptions,
-    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue)
-    : RemoteDecoderParent(aParent, aOptions, aManagerThread, aDecodeTaskQueue),
+    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue,
+    Maybe<uint64_t> aMediaEngineId)
+    : RemoteDecoderParent(aParent, aOptions, aManagerThread, aDecodeTaskQueue,
+                          aMediaEngineId),
       mAudioInfo(aAudioInfo) {}
 
 IPCResult RemoteAudioDecoderParent::RecvConstruct(
     ConstructResolver&& aResolver) {
-  auto params = CreateDecoderParams{mAudioInfo, mOptions,
-                                    CreateDecoderParams::NoWrapper(true)};
+  auto params =
+      CreateDecoderParams{mAudioInfo, mOptions,
+                          CreateDecoderParams::NoWrapper(true), mMediaEngineId};
 
   mParent->EnsurePDMFactory().CreateDecoder(params)->Then(
       GetCurrentSerialEventTarget(), __func__,
diff --git a/dom/media/ipc/RemoteAudioDecoder.h b/dom/media/ipc/RemoteAudioDecoder.h
index c09834eac003..d14eebb2ba5a 100644
--- a/dom/media/ipc/RemoteAudioDecoder.h
+++ b/dom/media/ipc/RemoteAudioDecoder.h
@@ -18,7 +18,8 @@ class RemoteAudioDecoderChild final : public RemoteDecoderChild {
 
   MOZ_IS_CLASS_INIT
   MediaResult InitIPDL(const AudioInfo& aAudioInfo,
-                       const CreateDecoderParams::OptionSet& aOptions);
+                       const CreateDecoderParams::OptionSet& aOptions,
+                       const Maybe<uint64_t>& aMediaEngineId);
 
   MediaResult ProcessOutput(DecodedOutputIPDL&& aDecodedData) override;
 };
@@ -29,7 +30,8 @@ class RemoteAudioDecoderParent final : public RemoteDecoderParent {
                            const AudioInfo& aAudioInfo,
                            const CreateDecoderParams::OptionSet& aOptions,
                            nsISerialEventTarget* aManagerThread,
-                           TaskQueue* aDecodeTaskQueue);
+                           TaskQueue* aDecodeTaskQueue,
+                           Maybe<uint64_t> aMediaEngineId);
 
  protected:
   IPCResult RecvConstruct(ConstructResolver&& aResolver) override;
diff --git a/dom/media/ipc/RemoteDecoderManagerChild.cpp b/dom/media/ipc/RemoteDecoderManagerChild.cpp
index 35bf0ea3f80b..49d537efee63 100644
--- a/dom/media/ipc/RemoteDecoderManagerChild.cpp
+++ b/dom/media/ipc/RemoteDecoderManagerChild.cpp
@@ -269,18 +269,26 @@ RemoteDecoderManagerChild::CreateAudioDecoder(
     return PlatformDecoderModule::CreateDecoderPromise::CreateAndReject(
         NS_ERROR_DOM_MEDIA_CANCELED, __func__);
   }
+
+  bool useUtilityAudioDecoding = StaticPrefs::media_utility_process_enabled() &&
+                                 aLocation == RemoteDecodeIn::UtilityProcess;
+#ifdef MOZ_WMF
+  // If the media engine Id is specified, using the media engine in the RDD
+  // process instead.
+  useUtilityAudioDecoding = useUtilityAudioDecoding &&
+                            !(aParams.mMediaEngineId &&
+                              StaticPrefs::media_wmf_media_engine_enabled());
+#endif
   RefPtr<GenericNonExclusivePromise> launchPromise =
-      (StaticPrefs::media_utility_process_enabled() &&
-       aLocation == RemoteDecodeIn::UtilityProcess)
-          ? LaunchUtilityProcessIfNeeded()
-          : LaunchRDDProcessIfNeeded();
+      useUtilityAudioDecoding ? LaunchUtilityProcessIfNeeded()
+                              : LaunchRDDProcessIfNeeded();
 
   return launchPromise->Then(
       managerThread, __func__,
       [params = CreateDecoderParamsForAsync(aParams), aLocation](bool) {
         auto child = MakeRefPtr<RemoteAudioDecoderChild>();
-        MediaResult result =
-            child->InitIPDL(params.AudioConfig(), params.mOptions);
+        MediaResult result = child->InitIPDL(
+            params.AudioConfig(), params.mOptions, params.mMediaEngineId);
         if (NS_FAILED(result)) {
           return PlatformDecoderModule::CreateDecoderPromise::CreateAndReject(
               result, __func__);
@@ -332,7 +340,8 @@ RemoteDecoderManagerChild::CreateVideoDecoder(
             params.VideoConfig(), params.mRate.mValue, params.mOptions,
             params.mKnowsCompositor
                 ? Some(params.mKnowsCompositor->GetTextureFactoryIdentifier())
-                : Nothing());
+                : Nothing(),
+            params.mMediaEngineId);
         if (NS_FAILED(result)) {
           return PlatformDecoderModule::CreateDecoderPromise::CreateAndReject(
               result, __func__);
@@ -548,7 +557,8 @@ RemoteDecoderManagerChild::LaunchUtilityProcessIfNeeded() {
 PRemoteDecoderChild* RemoteDecoderManagerChild::AllocPRemoteDecoderChild(
     const RemoteDecoderInfoIPDL& /* not used */,
     const CreateDecoderParams::OptionSet& aOptions,
-    const Maybe<layers::TextureFactoryIdentifier>& aIdentifier) {
+    const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
+    const Maybe<uint64_t>& aMediaEngineId) {
   // RemoteDecoderModule is responsible for creating RemoteDecoderChild
   // classes.
   MOZ_ASSERT(false,
diff --git a/dom/media/ipc/RemoteDecoderManagerChild.h b/dom/media/ipc/RemoteDecoderManagerChild.h
index bcab768dd9ad..9c5804a7bb29 100644
--- a/dom/media/ipc/RemoteDecoderManagerChild.h
+++ b/dom/media/ipc/RemoteDecoderManagerChild.h
@@ -92,6 +92,9 @@ class RemoteDecoderManagerChild final
   RemoteDecodeIn Location() const { return mLocation; }
   layers::VideoBridgeSource GetSource() const;
 
+  // A thread-safe method to launch the RDD process if it hasn't launched yet.
+  static RefPtr<GenericNonExclusivePromise> LaunchRDDProcessIfNeeded();
+
  protected:
   void InitIPDL();
 
@@ -102,7 +105,8 @@ class RemoteDecoderManagerChild final
   PRemoteDecoderChild* AllocPRemoteDecoderChild(
       const RemoteDecoderInfoIPDL& aRemoteDecoderInfo,
       const CreateDecoderParams::OptionSet& aOptions,
-      const Maybe<layers::TextureFactoryIdentifier>& aIdentifier);
+      const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
+      const Maybe<uint64_t>& aMediaEngineId);
   bool DeallocPRemoteDecoderChild(PRemoteDecoderChild* actor);
 
   PMFMediaEngineChild* AllocPMFMediaEngineChild();
@@ -120,7 +124,6 @@ class RemoteDecoderManagerChild final
       Endpoint<PRemoteDecoderManagerChild>&& aEndpoint);
   static void OpenForUtilityProcess(
       Endpoint<PRemoteDecoderManagerChild>&& aEndpoint);
-  static RefPtr<GenericNonExclusivePromise> LaunchRDDProcessIfNeeded();
   static RefPtr<GenericNonExclusivePromise> LaunchUtilityProcessIfNeeded();
 
   RefPtr<RemoteDecoderManagerChild> mIPDLSelfRef;
diff --git a/dom/media/ipc/RemoteDecoderManagerParent.cpp b/dom/media/ipc/RemoteDecoderManagerParent.cpp
index 859a3babd568..d69086dfb5b3 100644
--- a/dom/media/ipc/RemoteDecoderManagerParent.cpp
+++ b/dom/media/ipc/RemoteDecoderManagerParent.cpp
@@ -191,7 +191,8 @@ void RemoteDecoderManagerParent::ActorDestroy(
 PRemoteDecoderParent* RemoteDecoderManagerParent::AllocPRemoteDecoderParent(
     const RemoteDecoderInfoIPDL& aRemoteDecoderInfo,
     const CreateDecoderParams::OptionSet& aOptions,
-    const Maybe<layers::TextureFactoryIdentifier>& aIdentifier) {
+    const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
+    const Maybe<uint64_t>& aMediaEngineId) {
   RefPtr<TaskQueue> decodeTaskQueue =
       TaskQueue::Create(GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER),
                         "RemoteVideoDecoderParent::mDecodeTaskQueue");
@@ -202,13 +203,14 @@ PRemoteDecoderParent* RemoteDecoderManagerParent::AllocPRemoteDecoderParent(
         aRemoteDecoderInfo.get_VideoDecoderInfoIPDL();
     return new RemoteVideoDecoderParent(
         this, decoderInfo.videoInfo(), decoderInfo.framerate(), aOptions,
-        aIdentifier, sRemoteDecoderManagerParentThread, decodeTaskQueue);
+        aIdentifier, sRemoteDecoderManagerParentThread, decodeTaskQueue,
+        aMediaEngineId);
   }
 
   if (aRemoteDecoderInfo.type() == RemoteDecoderInfoIPDL::TAudioInfo) {
     return new RemoteAudioDecoderParent(
         this, aRemoteDecoderInfo.get_AudioInfo(), aOptions,
-        sRemoteDecoderManagerParentThread, decodeTaskQueue);
+        sRemoteDecoderManagerParentThread, decodeTaskQueue, aMediaEngineId);
   }
 
   MOZ_CRASH("unrecognized type of RemoteDecoderInfoIPDL union");
diff --git a/dom/media/ipc/RemoteDecoderManagerParent.h b/dom/media/ipc/RemoteDecoderManagerParent.h
index 27f0ea6984cf..218fed0a95a9 100644
--- a/dom/media/ipc/RemoteDecoderManagerParent.h
+++ b/dom/media/ipc/RemoteDecoderManagerParent.h
@@ -58,7 +58,8 @@ class RemoteDecoderManagerParent final
   PRemoteDecoderParent* AllocPRemoteDecoderParent(
       const RemoteDecoderInfoIPDL& aRemoteDecoderInfo,
       const CreateDecoderParams::OptionSet& aOptions,
-      const Maybe<layers::TextureFactoryIdentifier>& aIdentifier);
+      const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
+      const Maybe<uint64_t>& aMediaEngineId);
   bool DeallocPRemoteDecoderParent(PRemoteDecoderParent* actor);
 
   PMFMediaEngineParent* AllocPMFMediaEngineParent();
diff --git a/dom/media/ipc/RemoteDecoderParent.cpp b/dom/media/ipc/RemoteDecoderParent.cpp
index 4ae4cfe9007b..5116a0f6d156 100644
--- a/dom/media/ipc/RemoteDecoderParent.cpp
+++ b/dom/media/ipc/RemoteDecoderParent.cpp
@@ -13,11 +13,13 @@ namespace mozilla {
 RemoteDecoderParent::RemoteDecoderParent(
     RemoteDecoderManagerParent* aParent,
     const CreateDecoderParams::OptionSet& aOptions,
-    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue)
+    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue,
+    Maybe<uint64_t> aMediaEngineId)
     : ShmemRecycleAllocator(this),
       mParent(aParent),
       mOptions(aOptions),
       mDecodeTaskQueue(aDecodeTaskQueue),
+      mMediaEngineId(aMediaEngineId),
       mManagerThread(aManagerThread) {
   MOZ_COUNT_CTOR(RemoteDecoderParent);
   MOZ_ASSERT(OnManagerThread());
diff --git a/dom/media/ipc/RemoteDecoderParent.h b/dom/media/ipc/RemoteDecoderParent.h
index bce56ee77e25..df6f3796771f 100644
--- a/dom/media/ipc/RemoteDecoderParent.h
+++ b/dom/media/ipc/RemoteDecoderParent.h
@@ -26,7 +26,8 @@ class RemoteDecoderParent : public ShmemRecycleAllocator<RemoteDecoderParent>,
   RemoteDecoderParent(RemoteDecoderManagerParent* aParent,
                       const CreateDecoderParams::OptionSet& aOptions,
                       nsISerialEventTarget* aManagerThread,
-                      TaskQueue* aDecodeTaskQueue);
+                      TaskQueue* aDecodeTaskQueue,
+                      Maybe<uint64_t> aMediaEngineId);
 
   void Destroy();
 
@@ -55,6 +56,9 @@ class RemoteDecoderParent : public ShmemRecycleAllocator<RemoteDecoderParent>,
   const RefPtr<TaskQueue> mDecodeTaskQueue;
   RefPtr<MediaDataDecoder> mDecoder;
 
+  // Only be used on Windows when the media engine playback is enabled.
+  const Maybe<uint64_t> mMediaEngineId;
+
  private:
   void DecodeNextSample(const RefPtr<ArrayOfRemoteMediaRawData>& aData,
                         size_t aIndex, MediaDataDecoder::DecodedData&& aOutput,
diff --git a/dom/media/ipc/RemoteVideoDecoder.cpp b/dom/media/ipc/RemoteVideoDecoder.cpp
index a13a6fafb8af..c90dcb17d15d 100644
--- a/dom/media/ipc/RemoteVideoDecoder.cpp
+++ b/dom/media/ipc/RemoteVideoDecoder.cpp
@@ -91,7 +91,8 @@ MediaResult RemoteVideoDecoderChild::ProcessOutput(
 MediaResult RemoteVideoDecoderChild::InitIPDL(
     const VideoInfo& aVideoInfo, float aFramerate,
     const CreateDecoderParams::OptionSet& aOptions,
-    Maybe<layers::TextureFactoryIdentifier> aIdentifier) {
+    Maybe<layers::TextureFactoryIdentifier> aIdentifier,
+    const Maybe<uint64_t>& aMediaEngineId) {
   MOZ_ASSERT_IF(mLocation == RemoteDecodeIn::GpuProcess, aIdentifier);
 
   RefPtr<RemoteDecoderManagerChild> manager =
@@ -123,7 +124,7 @@ MediaResult RemoteVideoDecoderChild::InitIPDL(
   mIPDLSelfRef = this;
   VideoDecoderInfoIPDL decoderInfo(aVideoInfo, aFramerate);
   Unused << manager->SendPRemoteDecoderConstructor(this, decoderInfo, aOptions,
-                                                   aIdentifier);
+                                                   aIdentifier, aMediaEngineId);
 
   return NS_OK;
 }
@@ -132,8 +133,10 @@ RemoteVideoDecoderParent::RemoteVideoDecoderParent(
     RemoteDecoderManagerParent* aParent, const VideoInfo& aVideoInfo,
     float aFramerate, const CreateDecoderParams::OptionSet& aOptions,
     const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
-    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue)
-    : RemoteDecoderParent(aParent, aOptions, aManagerThread, aDecodeTaskQueue),
+    nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue,
+    Maybe<uint64_t> aMediaEngineId)
+    : RemoteDecoderParent(aParent, aOptions, aManagerThread, aDecodeTaskQueue,
+                          aMediaEngineId),
       mVideoInfo(aVideoInfo),
       mFramerate(aFramerate) {
   if (aIdentifier) {
@@ -157,6 +160,7 @@ IPCResult RemoteVideoDecoderParent::RecvConstruct(
       mVideoInfo,     mKnowsCompositor,
       imageContainer, CreateDecoderParams::VideoFrameRate(mFramerate),
       mOptions,       CreateDecoderParams::NoWrapper(true),
+      mMediaEngineId,
   };
 
   mParent->EnsurePDMFactory().CreateDecoder(params)->Then(
diff --git a/dom/media/ipc/RemoteVideoDecoder.h b/dom/media/ipc/RemoteVideoDecoder.h
index cb5ea6bda65a..259471da1f8e 100644
--- a/dom/media/ipc/RemoteVideoDecoder.h
+++ b/dom/media/ipc/RemoteVideoDecoder.h
@@ -39,7 +39,8 @@ class RemoteVideoDecoderChild : public RemoteDecoderChild {
   MOZ_IS_CLASS_INIT MediaResult
   InitIPDL(const VideoInfo& aVideoInfo, float aFramerate,
            const CreateDecoderParams::OptionSet& aOptions,
-           mozilla::Maybe<layers::TextureFactoryIdentifier> aIdentifier);
+           mozilla::Maybe<layers::TextureFactoryIdentifier> aIdentifier,
+           const Maybe<uint64_t>& aMediaEngineId);
 
   MediaResult ProcessOutput(DecodedOutputIPDL&& aDecodedData) override;
 
@@ -53,7 +54,8 @@ class RemoteVideoDecoderParent final : public RemoteDecoderParent {
       RemoteDecoderManagerParent* aParent, const VideoInfo& aVideoInfo,
       float aFramerate, const CreateDecoderParams::OptionSet& aOptions,
       const Maybe<layers::TextureFactoryIdentifier>& aIdentifier,
-      nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue);
+      nsISerialEventTarget* aManagerThread, TaskQueue* aDecodeTaskQueue,
+      Maybe<uint64_t> aMediaEngineId);
 
  protected:
   IPCResult RecvConstruct(ConstructResolver&& aResolver) override;
diff --git a/dom/media/ipc/moz.build b/dom/media/ipc/moz.build
index 1657c39d13d4..879388db8ee6 100644
--- a/dom/media/ipc/moz.build
+++ b/dom/media/ipc/moz.build
@@ -67,6 +67,9 @@ if CONFIG["MOZ_WMF"]:
         "MFMediaEngineParent.h",
         "MFMediaEngineUtils.h",
     ]
+    LOCAL_INCLUDES += [
+        "../platforms/wmf",
+    ]
 
 # so we can include nsMacUtilsImpl.h in RDDParent.cpp for sandboxing
 LOCAL_INCLUDES += [
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index beb862102885..d87e157c2aa3 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -9164,6 +9164,12 @@
     value: true
     mirror: always
 
+# Using Windows Media Foundation Media Engine for encrypted playback
+-   name: media.wmf.media-engine.enabled
+    type: RelaxedAtomicBool
+    value: false
+    mirror: always
+
 #endif  # MOZ_WMF
 
 - name: media.decoder-doctor.testing