diff --git a/dom/media/CanvasCaptureMediaStream.cpp b/dom/media/CanvasCaptureMediaStream.cpp
index b587a6eb9f3a..85938db8dad1 100644
--- a/dom/media/CanvasCaptureMediaStream.cpp
+++ b/dom/media/CanvasCaptureMediaStream.cpp
@@ -54,7 +54,7 @@ void OutputStreamDriver::SetImage(const RefPtr<layers::Image>& aImage,
   TRACE_COMMENT("SourceMediaStream %p track %i", mSourceStream.get(), mTrackId);
 
   VideoSegment segment;
-  segment.AppendFrame(do_AddRef(aImage), 1, aImage->GetSize(), mPrincipalHandle,
+  segment.AppendFrame(do_AddRef(aImage), aImage->GetSize(), mPrincipalHandle,
                       false, aTime);
   mSourceStream->AppendToTrack(mTrackId, &segment);
 }
diff --git a/dom/media/MediaStreamGraph.cpp b/dom/media/MediaStreamGraph.cpp
index 828e807cf85d..586361bb31ea 100644
--- a/dom/media/MediaStreamGraph.cpp
+++ b/dom/media/MediaStreamGraph.cpp
@@ -2797,7 +2797,7 @@ void SourceMediaStream::AddDirectTrackListenerImpl(
         continue;
       }
       MOZ_ASSERT(!iter->mTimeStamp.IsNull());
-      bufferedVideo.AppendFrame(do_AddRef(iter->mFrame.GetImage()), 1,
+      bufferedVideo.AppendFrame(do_AddRef(iter->mFrame.GetImage()),
                                 iter->mFrame.GetIntrinsicSize(),
                                 iter->mFrame.GetPrincipalHandle(),
                                 iter->mFrame.GetForceBlack(), iter->mTimeStamp);
@@ -2811,9 +2811,9 @@ void SourceMediaStream::AddDirectTrackListenerImpl(
           continue;
         }
         bufferedVideo.AppendFrame(
-            do_AddRef(iter->mFrame.GetImage()), 1,
-            iter->mFrame.GetIntrinsicSize(), iter->mFrame.GetPrincipalHandle(),
-            iter->mFrame.GetForceBlack(), iter->mTimeStamp);
+            do_AddRef(iter->mFrame.GetImage()), iter->mFrame.GetIntrinsicSize(),
+            iter->mFrame.GetPrincipalHandle(), iter->mFrame.GetForceBlack(),
+            iter->mTimeStamp);
       }
     }
   }
diff --git a/dom/media/MediaStreamListener.cpp b/dom/media/MediaStreamListener.cpp
index 1aed46d74f3f..9ade6c825139 100644
--- a/dom/media/MediaStreamListener.cpp
+++ b/dom/media/MediaStreamListener.cpp
@@ -28,9 +28,10 @@ void DirectMediaStreamTrackListener::MirrorAndDisableSegment(
   aTo.Clear();
   if (aMode == DisabledTrackMode::SILENCE_BLACK) {
     for (VideoSegment::ChunkIterator it(aFrom); !it.IsEnded(); it.Next()) {
-      aTo.AppendFrame(do_AddRef(it->mFrame.GetImage()), it->GetDuration(),
+      aTo.AppendFrame(do_AddRef(it->mFrame.GetImage()),
                       it->mFrame.GetIntrinsicSize(), it->GetPrincipalHandle(),
                       true);
+      aTo.ExtendLastFrameBy(it->GetDuration());
     }
   } else if (aMode == DisabledTrackMode::SILENCE_FREEZE) {
     aTo.AppendNullData(aFrom.GetDuration());
diff --git a/dom/media/VideoSegment.cpp b/dom/media/VideoSegment.cpp
index 1d5b5eb93557..f5027ff08ead 100644
--- a/dom/media/VideoSegment.cpp
+++ b/dom/media/VideoSegment.cpp
@@ -86,11 +86,10 @@ already_AddRefed<Image> VideoFrame::CreateBlackImage(
 }
 
 void VideoSegment::AppendFrame(already_AddRefed<Image>&& aImage,
-                               StreamTime aDuration,
                                const IntSize& aIntrinsicSize,
                                const PrincipalHandle& aPrincipalHandle,
                                bool aForceBlack, TimeStamp aTimeStamp) {
-  VideoChunk* chunk = AppendChunk(aDuration);
+  VideoChunk* chunk = AppendChunk(0);
   chunk->mTimeStamp = aTimeStamp;
   VideoFrame frame(aImage, aIntrinsicSize);
   MOZ_ASSERT_IF(!IsNull(), !aTimeStamp.IsNull());
diff --git a/dom/media/VideoSegment.h b/dom/media/VideoSegment.h
index c4b5e3aa0f6b..a96d6c32164f 100644
--- a/dom/media/VideoSegment.h
+++ b/dom/media/VideoSegment.h
@@ -108,7 +108,7 @@ class VideoSegment : public MediaSegmentBase<VideoSegment, VideoChunk> {
 
   ~VideoSegment();
 
-  void AppendFrame(already_AddRefed<Image>&& aImage, StreamTime aDuration,
+  void AppendFrame(already_AddRefed<Image>&& aImage,
                    const IntSize& aIntrinsicSize,
                    const PrincipalHandle& aPrincipalHandle,
                    bool aForceBlack = false,
diff --git a/dom/media/VideoStreamTrack.cpp b/dom/media/VideoStreamTrack.cpp
index 5cc62669f56b..149495ebabe5 100644
--- a/dom/media/VideoStreamTrack.cpp
+++ b/dom/media/VideoStreamTrack.cpp
@@ -33,7 +33,7 @@ class VideoOutput : public DirectMediaStreamTrackListener {
         mSegment.Clear();
       }
       const VideoFrame& f = i->mFrame;
-      mSegment.AppendFrame(do_AddRef(f.GetImage()), 0, f.GetIntrinsicSize(),
+      mSegment.AppendFrame(do_AddRef(f.GetImage()), f.GetIntrinsicSize(),
                            f.GetPrincipalHandle(), f.GetForceBlack(),
                            i->mTimeStamp);
       mLastFrameTime = i->mTimeStamp;
diff --git a/dom/media/encoder/MediaEncoder.cpp b/dom/media/encoder/MediaEncoder.cpp
index e19551077f6f..d1794c86cfb0 100644
--- a/dom/media/encoder/MediaEncoder.cpp
+++ b/dom/media/encoder/MediaEncoder.cpp
@@ -235,7 +235,7 @@ class MediaEncoder::VideoTrackListener : public DirectMediaStreamTrackListener {
     VideoSegment copy;
     for (VideoSegment::ConstChunkIterator iter(video); !iter.IsEnded();
          iter.Next()) {
-      copy.AppendFrame(do_AddRef(iter->mFrame.GetImage()), 1,
+      copy.AppendFrame(do_AddRef(iter->mFrame.GetImage()),
                        iter->mFrame.GetIntrinsicSize(),
                        iter->mFrame.GetPrincipalHandle(),
                        iter->mFrame.GetForceBlack(), iter->mTimeStamp);
diff --git a/dom/media/encoder/TrackEncoder.cpp b/dom/media/encoder/TrackEncoder.cpp
index cf7b7421d8df..e6f7bf1d0396 100644
--- a/dom/media/encoder/TrackEncoder.cpp
+++ b/dom/media/encoder/TrackEncoder.cpp
@@ -482,9 +482,10 @@ void VideoTrackEncoder::NotifyEndOfStream() {
                  (mLastChunk.mTimeStamp - mStartTime).ToSeconds(),
                  absoluteEndTime.ToSeconds()));
       mOutgoingBuffer.AppendFrame(
-          lastImage.forget(), duration.value(),
-          mLastChunk.mFrame.GetIntrinsicSize(), PRINCIPAL_HANDLE_NONE,
-          mLastChunk.mFrame.GetForceBlack(), mLastChunk.mTimeStamp);
+          lastImage.forget(), mLastChunk.mFrame.GetIntrinsicSize(),
+          PRINCIPAL_HANDLE_NONE, mLastChunk.mFrame.GetForceBlack(),
+          mLastChunk.mTimeStamp);
+      mOutgoingBuffer.ExtendLastFrameBy(duration.value());
     }
   }
 
@@ -544,7 +545,7 @@ void VideoTrackEncoder::AdvanceCurrentTime(const TimeStamp& aTime) {
         // We encode at least one frame per second, even if there are none
         // flowing.
         previousChunk->mTimeStamp += TimeDuration::FromSeconds(1.0);
-        tempSegment.AppendFrame(do_AddRef(previousChunk->mFrame.GetImage()), 1,
+        tempSegment.AppendFrame(do_AddRef(previousChunk->mFrame.GetImage()),
                                 previousChunk->mFrame.GetIntrinsicSize(),
                                 previousChunk->mFrame.GetPrincipalHandle(),
                                 previousChunk->mFrame.GetForceBlack(),
@@ -571,7 +572,7 @@ void VideoTrackEncoder::AdvanceCurrentTime(const TimeStamp& aTime) {
       if (!previousChunk->IsNull()) {
         appendDupes(iter->mTimeStamp);
       }
-      tempSegment.AppendFrame(do_AddRef(iter->mFrame.GetImage()), 1,
+      tempSegment.AppendFrame(do_AddRef(iter->mFrame.GetImage()),
                               iter->mFrame.GetIntrinsicSize(),
                               iter->mFrame.GetPrincipalHandle(),
                               iter->mFrame.GetForceBlack(), iter->mTimeStamp);
@@ -654,9 +655,10 @@ void VideoTrackEncoder::AdvanceCurrentTime(const TimeStamp& aTime) {
 
     mEncodedTicks += duration.value();
     mOutgoingBuffer.AppendFrame(
-        do_AddRef(mLastChunk.mFrame.GetImage()), duration.value(),
+        do_AddRef(mLastChunk.mFrame.GetImage()),
         mLastChunk.mFrame.GetIntrinsicSize(), PRINCIPAL_HANDLE_NONE,
         mLastChunk.mFrame.GetForceBlack(), mLastChunk.mTimeStamp);
+    mOutgoingBuffer.ExtendLastFrameBy(duration.value());
     chunkAppended = true;
     mLastChunk = chunk;
   }
diff --git a/dom/media/gtest/TestVideoSegment.cpp b/dom/media/gtest/TestVideoSegment.cpp
index 33ffadc4300f..8f8bb9c8dc55 100644
--- a/dom/media/gtest/TestVideoSegment.cpp
+++ b/dom/media/gtest/TestVideoSegment.cpp
@@ -17,9 +17,8 @@ TEST(VideoSegment, TestAppendFrameForceBlack) {
   RefPtr<layers::Image> testImage = nullptr;
 
   VideoSegment segment;
-  segment.AppendFrame(testImage.forget(), mozilla::StreamTime(90000),
-                      mozilla::gfx::IntSize(640, 480), PRINCIPAL_HANDLE_NONE,
-                      true);
+  segment.AppendFrame(testImage.forget(), mozilla::gfx::IntSize(640, 480),
+                      PRINCIPAL_HANDLE_NONE, true);
 
   VideoSegment::ChunkIterator iter(segment);
   while (!iter.IsEnded()) {
@@ -33,8 +32,8 @@ TEST(VideoSegment, TestAppendFrameNotForceBlack) {
   RefPtr<layers::Image> testImage = nullptr;
 
   VideoSegment segment;
-  segment.AppendFrame(testImage.forget(), mozilla::StreamTime(90000),
-                      mozilla::gfx::IntSize(640, 480), PRINCIPAL_HANDLE_NONE);
+  segment.AppendFrame(testImage.forget(), mozilla::gfx::IntSize(640, 480),
+                      PRINCIPAL_HANDLE_NONE);
 
   VideoSegment::ChunkIterator iter(segment);
   while (!iter.IsEnded()) {
diff --git a/dom/media/gtest/TestVideoTrackEncoder.cpp b/dom/media/gtest/TestVideoTrackEncoder.cpp
index acdadd8385f2..427d872625fc 100644
--- a/dom/media/gtest/TestVideoTrackEncoder.cpp
+++ b/dom/media/gtest/TestVideoTrackEncoder.cpp
@@ -281,7 +281,7 @@ TEST(VP8VideoTrackEncoder, FrameEncode) {
   TimeStamp now = TimeStamp::Now();
   for (nsTArray<RefPtr<Image>>::size_type i = 0; i < images.Length(); i++) {
     RefPtr<Image> image = images[i];
-    segment.AppendFrame(image.forget(), 1, generator.GetSize(),
+    segment.AppendFrame(image.forget(), generator.GetSize(),
                         PRINCIPAL_HANDLE_NONE, false,
                         now + TimeDuration::FromSeconds(i));
   }
@@ -304,7 +304,7 @@ TEST(VP8VideoTrackEncoder, SingleFrameEncode) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   VideoSegment segment;
   TimeStamp now = TimeStamp::Now();
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -340,7 +340,7 @@ TEST(VP8VideoTrackEncoder, SameFrameEncode) {
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
   for (uint32_t i = 0; i < 15; ++i) {
-    segment.AppendFrame(do_AddRef(image), 1, generator.GetSize(),
+    segment.AppendFrame(do_AddRef(image), generator.GetSize(),
                         PRINCIPAL_HANDLE_NONE, false,
                         now + TimeDuration::FromSeconds(i * 0.1));
   }
@@ -375,7 +375,7 @@ TEST(VP8VideoTrackEncoder, SkippedFrames) {
   // Pass 100 frames of the shortest possible duration where we don't get
   // rounding errors between input/output rate.
   for (uint32_t i = 0; i < 100; ++i) {
-    segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+    segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                         PRINCIPAL_HANDLE_NONE, false,
                         now + TimeDuration::FromMilliseconds(i));
   }
@@ -411,13 +411,13 @@ TEST(VP8VideoTrackEncoder, RoundingErrorFramesEncode) {
   // then one frame to make the total duration one second.
   uint32_t usPerFrame = 99999;  // 99.999ms
   for (uint32_t i = 0; i < 9; ++i) {
-    segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+    segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                         PRINCIPAL_HANDLE_NONE, false,
                         now + TimeDuration::FromMicroseconds(i * usPerFrame));
   }
 
   // This last frame has timestamp start + 0.9s and duration 0.1s.
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.9));
 
@@ -448,12 +448,12 @@ TEST(VP8VideoTrackEncoder, TimestampFrameEncode) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.05));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.2));
 
@@ -497,12 +497,12 @@ TEST(VP8VideoTrackEncoder, DriftingFrameEncode) {
           [&](TimeStamp, TimeStamp aTime) { return now + (aTime - now) * 2; }));
 
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.05));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.2));
 
@@ -541,7 +541,7 @@ TEST(VP8VideoTrackEncoder, Suspended) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -550,7 +550,7 @@ TEST(VP8VideoTrackEncoder, Suspended) {
 
   encoder.Suspend(now + TimeDuration::FromSeconds(0.1));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.1));
   encoder.AppendVideoSegment(std::move(segment));
@@ -558,7 +558,7 @@ TEST(VP8VideoTrackEncoder, Suspended) {
 
   encoder.Resume(now + TimeDuration::FromSeconds(0.2));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.2));
   encoder.AppendVideoSegment(std::move(segment));
@@ -592,7 +592,7 @@ TEST(VP8VideoTrackEncoder, SuspendedUntilEnd) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -601,7 +601,7 @@ TEST(VP8VideoTrackEncoder, SuspendedUntilEnd) {
 
   encoder.Suspend(now + TimeDuration::FromSeconds(0.1));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.1));
   encoder.AppendVideoSegment(std::move(segment));
@@ -639,7 +639,7 @@ TEST(VP8VideoTrackEncoder, AlwaysSuspended) {
   encoder.Suspend(now);
 
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -669,7 +669,7 @@ TEST(VP8VideoTrackEncoder, SuspendedBeginning) {
   YUVBufferGenerator generator;
   generator.Init(mozilla::gfx::IntSize(640, 480));
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -678,7 +678,7 @@ TEST(VP8VideoTrackEncoder, SuspendedBeginning) {
 
   encoder.Resume(now + TimeDuration::FromSeconds(0.5));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(0.5));
   encoder.AppendVideoSegment(std::move(segment));
@@ -713,7 +713,7 @@ TEST(VP8VideoTrackEncoder, SuspendedOverlap) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -723,7 +723,7 @@ TEST(VP8VideoTrackEncoder, SuspendedOverlap) {
   encoder.Suspend(now + TimeDuration::FromSeconds(0.5));
 
   // Pass another 1s frame and resume after 0.3 of this new frame.
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromSeconds(1));
   encoder.AppendVideoSegment(std::move(segment));
@@ -759,7 +759,7 @@ TEST(VP8VideoTrackEncoder, PrematureEnding) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -790,7 +790,7 @@ TEST(VP8VideoTrackEncoder, DelayedStart) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now + TimeDuration::FromSeconds(0.5));
@@ -822,7 +822,7 @@ TEST(VP8VideoTrackEncoder, DelayedStartOtherEventOrder) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.AppendVideoSegment(std::move(segment));
@@ -853,7 +853,7 @@ TEST(VP8VideoTrackEncoder, VeryDelayedStart) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now + TimeDuration::FromSeconds(10));
@@ -887,7 +887,7 @@ TEST(VP8VideoTrackEncoder, LongFramesReEncoded) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
 
   encoder.SetStartOffset(now);
@@ -939,21 +939,21 @@ TEST(VP8VideoTrackEncoder, ShortKeyFrameInterval) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(400));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(600));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(750));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(900));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1100));
 
@@ -1008,21 +1008,21 @@ TEST(VP8VideoTrackEncoder, LongKeyFrameInterval) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(600));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(900));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1100));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1900));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2100));
 
@@ -1076,21 +1076,21 @@ TEST(VP8VideoTrackEncoder, DefaultKeyFrameInterval) {
   generator.Init(mozilla::gfx::IntSize(640, 480));
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(600));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(900));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1100));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1900));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2100));
 
@@ -1153,27 +1153,27 @@ TEST(VP8VideoTrackEncoder, DynamicKeyFrameIntervalChanges) {
   EncodedFrameContainer container;
   TimeStamp now = TimeStamp::Now();
   VideoSegment segment;
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false, now);
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(100));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(120));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(130));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(200));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(300));
 
   // The underlying encoder only gets passed frame N when frame N+1 is known,
   // so we pass in the next frame *before* the keyframe interval change.
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(500));
 
@@ -1186,19 +1186,19 @@ TEST(VP8VideoTrackEncoder, DynamicKeyFrameIntervalChanges) {
   encoder.AdvanceCurrentTime(now + TimeDuration::FromMilliseconds(501));
   ASSERT_TRUE(NS_SUCCEEDED(encoder.GetEncodedTrack(container)));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1300));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(1400));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2400));
 
   // The underlying encoder only gets passed frame N when frame N+1 is known,
   // so we pass in the next frame *before* the keyframe interval change.
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2500));
 
@@ -1209,13 +1209,13 @@ TEST(VP8VideoTrackEncoder, DynamicKeyFrameIntervalChanges) {
   encoder.AdvanceCurrentTime(now + TimeDuration::FromMilliseconds(2501));
   ASSERT_TRUE(NS_SUCCEEDED(encoder.GetEncodedTrack(container)));
 
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2600));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2800));
-  segment.AppendFrame(generator.GenerateI420Image(), 1, generator.GetSize(),
+  segment.AppendFrame(generator.GenerateI420Image(), generator.GetSize(),
                       PRINCIPAL_HANDLE_NONE, false,
                       now + TimeDuration::FromMilliseconds(2900));
 
diff --git a/dom/media/mediasink/DecodedStream.cpp b/dom/media/mediasink/DecodedStream.cpp
index b4d59d3fdf6c..f75c428c6cb9 100644
--- a/dom/media/mediasink/DecodedStream.cpp
+++ b/dom/media/mediasink/DecodedStream.cpp
@@ -596,9 +596,12 @@ static void WriteVideoToMediaStream(MediaStream* aStream, layers::Image* aImage,
   auto end = aStream->MicrosecondsToStreamTimeRoundDown(aEnd.ToMicroseconds());
   auto start =
       aStream->MicrosecondsToStreamTimeRoundDown(aStart.ToMicroseconds());
-  StreamTime duration = end - start;
-  aOutput->AppendFrame(image.forget(), duration, aIntrinsicSize,
-                       aPrincipalHandle, false, aTimeStamp);
+  aOutput->AppendFrame(image.forget(), aIntrinsicSize, aPrincipalHandle, false,
+                       aTimeStamp);
+  // Extend this so we get accurate durations for all frames.
+  // Because this track is pushed, we need durations so the graph can track
+  // when playout of the track has finished.
+  aOutput->ExtendLastFrameBy(end - start);
 }
 
 static bool ZeroDurationAtLastChunk(VideoSegment& aInput) {
diff --git a/dom/media/webrtc/MediaEngineDefault.cpp b/dom/media/webrtc/MediaEngineDefault.cpp
index 44f36cd5fabd..179c387f3ff8 100644
--- a/dom/media/webrtc/MediaEngineDefault.cpp
+++ b/dom/media/webrtc/MediaEngineDefault.cpp
@@ -323,7 +323,7 @@ void MediaEngineDefaultVideoSource::GenerateFrame() {
   }
 
   VideoSegment segment;
-  segment.AppendFrame(ycbcr_image.forget(), 1,
+  segment.AppendFrame(ycbcr_image.forget(),
                       gfx::IntSize(mOpts.mWidth, mOpts.mHeight),
                       mPrincipalHandle);
   ;
diff --git a/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
index 691f7dbcd0a5..c3b43f4afc47 100644
--- a/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
+++ b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
@@ -638,7 +638,7 @@ int MediaEngineRemoteVideoSource::DeliverFrame(
     MOZ_ASSERT(mState == kStarted);
     VideoSegment segment;
     mImageSize = image->GetSize();
-    segment.AppendFrame(image.forget(), 1, mImageSize, mPrincipal);
+    segment.AppendFrame(image.forget(), mImageSize, mPrincipal);
     mStream->AppendToTrack(mTrackID, &segment);
   }
 
diff --git a/dom/media/webrtc/MediaEngineTabVideoSource.cpp b/dom/media/webrtc/MediaEngineTabVideoSource.cpp
index a25ef67f0ba0..fe679fa8bbac 100644
--- a/dom/media/webrtc/MediaEngineTabVideoSource.cpp
+++ b/dom/media/webrtc/MediaEngineTabVideoSource.cpp
@@ -384,7 +384,7 @@ void MediaEngineTabVideoSource::Draw() {
   }
 
   VideoSegment segment;
-  segment.AppendFrame(do_AddRef(rgbImage), 1, size, mPrincipalHandle);
+  segment.AppendFrame(do_AddRef(rgbImage), size, mPrincipalHandle);
   // This can fail if either a) we haven't added the track yet, or b)
   // we've removed or ended the track.
   mStreamMain->AppendToTrack(mTrackIDMain, &segment);
diff --git a/media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp b/media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp
index 22be8d216e88..d5e27931edee 100644
--- a/media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp
+++ b/media/webrtc/signaling/src/mediapipeline/MediaPipeline.cpp
@@ -1782,7 +1782,7 @@ class MediaPipelineReceiveVideo::PipelineListener
 
     VideoSegment segment;
     auto size = image->GetSize();
-    segment.AppendFrame(image.forget(), 1, size, mPrincipalHandle);
+    segment.AppendFrame(image.forget(), size, mPrincipalHandle);
     mSource->AppendToTrack(mTrackId, &segment);
   }