diff --git a/packager/media/base/demuxer.cc b/packager/media/base/demuxer.cc
index 93e90e1962..95f4ef5708 100644
--- a/packager/media/base/demuxer.cc
+++ b/packager/media/base/demuxer.cc
@@ -107,7 +107,7 @@ Status Demuxer::Run() {
 
   if (status.error_code() == error::END_OF_STREAM) {
     for (int stream_index : stream_indexes_) {
-      status = FlushStream(stream_index);
+      status = FlushDownstream(stream_index);
       if (!status.ok())
         return status;
     }
diff --git a/packager/media/base/media_handler.cc b/packager/media/base/media_handler.cc
index 0ab130cb9b..0b91c0f8ba 100644
--- a/packager/media/base/media_handler.cc
+++ b/packager/media/base/media_handler.cc
@@ -38,15 +38,11 @@ Status MediaHandler::Initialize() {
   return Status::OK;
 }
 
-Status MediaHandler::FlushStream(int input_stream_index) {
+Status MediaHandler::OnFlushRequest(int input_stream_index) {
   // The default implementation treats the output stream index to be identical
   // to the input stream index, which is true for most handlers.
-  auto handler_it = output_handlers_.find(input_stream_index);
-  if (handler_it == output_handlers_.end()) {
-    return Status(error::NOT_FOUND,
-                  "No output handler exist at the specified index.");
-  }
-  return handler_it->second.first->FlushStream(handler_it->second.second);
+  const int output_stream_index = input_stream_index;
+  return FlushDownstream(output_stream_index);
 }
 
 bool MediaHandler::ValidateOutputStreamIndex(int stream_index) const {
@@ -64,5 +60,14 @@ Status MediaHandler::Dispatch(std::unique_ptr<StreamData> stream_data) {
   return handler_it->second.first->Process(std::move(stream_data));
 }
 
+Status MediaHandler::FlushDownstream(int output_stream_index) {
+  auto handler_it = output_handlers_.find(output_stream_index);
+  if (handler_it == output_handlers_.end()) {
+    return Status(error::NOT_FOUND,
+                  "No output handler exist at the specified index.");
+  }
+  return handler_it->second.first->OnFlushRequest(handler_it->second.second);
+}
+
 }  // namespace media
 }  // namespace shaka
diff --git a/packager/media/base/media_handler.h b/packager/media/base/media_handler.h
index 8c44c6f6b1..6053d255f8 100644
--- a/packager/media/base/media_handler.h
+++ b/packager/media/base/media_handler.h
@@ -96,8 +96,8 @@ class MediaHandler {
   /// handlers after finishing processing if needed.
   virtual Status Process(std::unique_ptr<StreamData> stream_data) = 0;
 
-  /// Flush the stream at the specified input stream index.
-  virtual Status FlushStream(int input_stream_index);
+  /// Event handler for flush request at the specific input stream index.
+  virtual Status OnFlushRequest(int input_stream_index);
 
   /// Validate if the stream at the specified index actually exists.
   virtual bool ValidateOutputStreamIndex(int stream_index) const;
@@ -170,6 +170,9 @@ class MediaHandler {
     return Dispatch(std::move(stream_data));
   }
 
+  /// Flush the downstream connected at the specified output stream index.
+  Status FlushDownstream(int output_stream_index);
+
   int num_input_streams() const { return num_input_streams_; }
   int next_output_stream_index() const { return next_output_stream_index_; }
   const std::map<int, std::pair<std::shared_ptr<MediaHandler>, int>>&
diff --git a/packager/media/base/media_handler_test_base.cc b/packager/media/base/media_handler_test_base.cc
index 0f843324ad..79cf1092ce 100644
--- a/packager/media/base/media_handler_test_base.cc
+++ b/packager/media/base/media_handler_test_base.cc
@@ -73,7 +73,7 @@ class FakeMediaHandler : public MediaHandler {
     stream_data_vector_.push_back(std::move(stream_data));
     return Status::OK;
   }
-  Status FlushStream(int input_stream_index) override { return Status::OK; }
+  Status OnFlushRequest(int input_stream_index) override { return Status::OK; }
   bool ValidateOutputStreamIndex(int stream_index) const override {
     return true;
   }
diff --git a/packager/media/base/muxer.h b/packager/media/base/muxer.h
index 9811b3c169..0aa1dcd6a5 100644
--- a/packager/media/base/muxer.h
+++ b/packager/media/base/muxer.h
@@ -97,7 +97,7 @@ class Muxer : public MediaHandler {
   /// @{
   Status InitializeInternal() override { return Status::OK; }
   Status Process(std::unique_ptr<StreamData> stream_data) override;
-  Status FlushStream(int input_stream_index) override { return Finalize(); }
+  Status OnFlushRequest(int input_stream_index) override { return Finalize(); }
   /// @}
 
   const MuxerOptions& options() const { return options_; }
diff --git a/packager/media/chunking/chunking_handler.cc b/packager/media/chunking/chunking_handler.cc
index 9ee98599c1..247a52abb1 100644
--- a/packager/media/chunking/chunking_handler.cc
+++ b/packager/media/chunking/chunking_handler.cc
@@ -111,7 +111,7 @@ Status ChunkingHandler::Process(std::unique_ptr<StreamData> stream_data) {
   return Dispatch(std::move(stream_data));
 }
 
-Status ChunkingHandler::FlushStream(int input_stream_index) {
+Status ChunkingHandler::OnFlushRequest(int input_stream_index) {
   if (segment_info_[input_stream_index]) {
     Status status;
     if (input_stream_index != main_stream_index_) {
@@ -128,7 +128,8 @@ Status ChunkingHandler::FlushStream(int input_stream_index) {
         return status;
     }
   }
-  return MediaHandler::FlushStream(input_stream_index);
+  const int output_stream_index = input_stream_index;
+  return FlushDownstream(output_stream_index);
 }
 
 Status ChunkingHandler::ProcessMediaSample(const MediaSample* sample) {
diff --git a/packager/media/chunking/chunking_handler.h b/packager/media/chunking/chunking_handler.h
index 4db1d74dad..67841efbfd 100644
--- a/packager/media/chunking/chunking_handler.h
+++ b/packager/media/chunking/chunking_handler.h
@@ -68,7 +68,7 @@ class ChunkingHandler : public MediaHandler {
   /// @{
   Status InitializeInternal() override;
   Status Process(std::unique_ptr<StreamData> stream_data) override;
-  Status FlushStream(int input_stream_index) override;
+  Status OnFlushRequest(int input_stream_index) override;
   /// @}
 
  private:
diff --git a/packager/media/chunking/chunking_handler_unittest.cc b/packager/media/chunking/chunking_handler_unittest.cc
index 67d92c6977..608b546300 100644
--- a/packager/media/chunking/chunking_handler_unittest.cc
+++ b/packager/media/chunking/chunking_handler_unittest.cc
@@ -43,8 +43,8 @@ class ChunkingHandlerTest : public MediaHandlerTestBase {
     return chunking_handler_->Process(std::move(stream_data));
   }
 
-  Status FlushStream(int stream_index) {
-    return chunking_handler_->FlushStream(stream_index);
+  Status OnFlushRequest(int stream_index) {
+    return chunking_handler_->OnFlushRequest(stream_index);
   }
 
  protected:
@@ -80,7 +80,7 @@ TEST_F(ChunkingHandlerTest, AudioNoSubsegmentsThenFlush) {
   }
 
   ClearOutputStreamDataVector();
-  ASSERT_OK(FlushStream(kStreamIndex0));
+  ASSERT_OK(OnFlushRequest(kStreamIndex0));
   EXPECT_THAT(GetOutputStreamDataVector(),
               ElementsAre(IsSegmentInfo(kStreamIndex0, kDuration1 * 3,
                                         kDuration1 * 2, !kIsSubsegment)));
@@ -210,7 +210,7 @@ TEST_F(ChunkingHandlerTest, AudioAndVideo) {
                         kDuration1)));
 
   ClearOutputStreamDataVector();
-  ASSERT_OK(FlushStream(kStreamIndex0));
+  ASSERT_OK(OnFlushRequest(kStreamIndex0));
   EXPECT_THAT(
       GetOutputStreamDataVector(),
       ElementsAre(
@@ -220,7 +220,7 @@ TEST_F(ChunkingHandlerTest, AudioAndVideo) {
                         kDuration0 * 3, !kIsSubsegment)));
 
   ClearOutputStreamDataVector();
-  ASSERT_OK(FlushStream(kStreamIndex1));
+  ASSERT_OK(OnFlushRequest(kStreamIndex1));
   EXPECT_THAT(GetOutputStreamDataVector(),
               ElementsAre(IsSegmentInfo(kStreamIndex1,
                                         kVideoStartTimestamp + kDuration1 * 3,
@@ -228,8 +228,8 @@ TEST_F(ChunkingHandlerTest, AudioAndVideo) {
 
   // Flush again will do nothing.
   ClearOutputStreamDataVector();
-  ASSERT_OK(FlushStream(kStreamIndex0));
-  ASSERT_OK(FlushStream(kStreamIndex1));
+  ASSERT_OK(OnFlushRequest(kStreamIndex0));
+  ASSERT_OK(OnFlushRequest(kStreamIndex1));
   EXPECT_THAT(GetOutputStreamDataVector(), IsEmpty());
 }