diff --git a/media/base/muxer.cc b/media/base/muxer.cc
index 86466c1ddf..e634c44915 100644
--- a/media/base/muxer.cc
+++ b/media/base/muxer.cc
@@ -11,7 +11,10 @@
 namespace media {
 
 Muxer::Muxer(const MuxerOptions& options)
-    : options_(options), encryptor_source_(NULL), clear_lead_in_seconds_(0) {}
+    : options_(options),
+      encryptor_source_(NULL),
+      clear_lead_in_seconds_(0),
+      muxer_listener_(NULL) {}
 
 Muxer::~Muxer() {}
 
@@ -57,4 +60,8 @@ Status Muxer::Run() {
   return status.Matches(Status(error::END_OF_STREAM, "")) ? Status::OK : status;
 }
 
+void Muxer::SetMuxerListener(media::event::MuxerListener* muxer_listener) {
+  muxer_listener_ = muxer_listener;
+}
+
 }  // namespace media
diff --git a/media/base/muxer.h b/media/base/muxer.h
index a73905f75c..1f1724cc65 100644
--- a/media/base/muxer.h
+++ b/media/base/muxer.h
@@ -20,6 +20,10 @@ class EncryptorSource;
 class MediaSample;
 class MediaStream;
 
+namespace event {
+class MuxerListener;
+}
+
 class Muxer {
  public:
   explicit Muxer(const MuxerOptions& options);
@@ -46,12 +50,17 @@ class Muxer {
   // Drives the remuxing from muxer side (pull).
   virtual Status Run();
 
+  // Set a MuxerListener event handler for this object. Ownership does not
+  // transfer.
+  void SetMuxerListener(event::MuxerListener* muxer_listener);
+
   const std::vector<MediaStream*>& streams() const { return streams_; }
 
  protected:
   const MuxerOptions& options() const { return options_; }
   EncryptorSource* encryptor_source() { return encryptor_source_; }
   double clear_lead_in_seconds() const { return clear_lead_in_seconds_; }
+  event::MuxerListener* muxer_listener() { return muxer_listener_; }
 
  private:
   MuxerOptions options_;
@@ -59,6 +68,8 @@ class Muxer {
   EncryptorSource* encryptor_source_;
   double clear_lead_in_seconds_;
 
+  event::MuxerListener* muxer_listener_;
+
   DISALLOW_COPY_AND_ASSIGN(Muxer);
 };
 
diff --git a/media/mp4/mp4_general_segmenter.cc b/media/mp4/mp4_general_segmenter.cc
index b0cf40a369..dcf096943a 100644
--- a/media/mp4/mp4_general_segmenter.cc
+++ b/media/mp4/mp4_general_segmenter.cc
@@ -55,6 +55,19 @@ Status MP4GeneralSegmenter::Initialize(
   return status;
 }
 
+// TODO(rkuroiwa): Maybe GetInitRange() should return true. Init segment does
+// exist and we know the size and offset.
+bool MP4GeneralSegmenter::GetInitRange(size_t* offset, size_t* size) {
+  DLOG(INFO) << "MP4GeneralSegmenter outputs init segment: "
+             << options().output_file_name;
+  return false;
+}
+
+bool MP4GeneralSegmenter::GetIndexRange(size_t* offset, size_t* size) {
+  DLOG(INFO) << "MP4GeneralSegmenter does not have index range.";
+  return false;
+}
+
 Status MP4GeneralSegmenter::FinalizeSegment() {
   Status status = MP4Segmenter::FinalizeSegment();
   if (!status.ok())
diff --git a/media/mp4/mp4_general_segmenter.h b/media/mp4/mp4_general_segmenter.h
index 35753bb36e..489b0e7a25 100644
--- a/media/mp4/mp4_general_segmenter.h
+++ b/media/mp4/mp4_general_segmenter.h
@@ -39,6 +39,9 @@ class MP4GeneralSegmenter : public MP4Segmenter {
                             double clear_lead_in_seconds,
                             const std::vector<MediaStream*>& streams) OVERRIDE;
 
+  virtual bool GetInitRange(size_t* offset, size_t* size) OVERRIDE;
+  virtual bool GetIndexRange(size_t* offset, size_t* size) OVERRIDE;
+
  protected:
   virtual Status FinalizeSegment() OVERRIDE;
 
diff --git a/media/mp4/mp4_muxer.cc b/media/mp4/mp4_muxer.cc
index f7c762cafd..ae64f8f17b 100644
--- a/media/mp4/mp4_muxer.cc
+++ b/media/mp4/mp4_muxer.cc
@@ -11,6 +11,7 @@
 #include "media/base/media_sample.h"
 #include "media/base/media_stream.h"
 #include "media/base/video_stream_info.h"
+#include "media/event/muxer_listener.h"
 #include "media/file/file.h"
 #include "media/mp4/box_definitions.h"
 #include "media/mp4/es_descriptor.h"
@@ -28,6 +29,16 @@ uint64 IsoTimeNow() {
   const uint64 kIsomTimeOffset = 2082844800l;
   return kIsomTimeOffset + base::Time::Now().ToDoubleT();
 }
+
+// Sets the range start and end value from offset and size.
+// |start| and |end| are for byte-range-spec specified in RFC2616.
+void SetStartAndEndFromOffsetAndSize(size_t offset, size_t size,
+                                     uint32* start, uint32* end) {
+  DCHECK(start && end);
+  *start = static_cast<uint32>(offset);
+  // Note that ranges are inclusive. So we need - 1.
+  *end = *start + static_cast<uint32>(size) - 1;
+}
 }  // namespace
 
 namespace media {
@@ -96,13 +107,26 @@ Status MP4Muxer::Initialize() {
     segmenter_.reset(
         new MP4GeneralSegmenter(options(), ftyp.Pass(), moov.Pass()));
   }
-  return segmenter_->Initialize(
+
+  Status segmenter_initialized = segmenter_->Initialize(
       encryptor_source(), clear_lead_in_seconds(), streams());
+
+  if (!segmenter_initialized.ok())
+    return segmenter_initialized;
+
+  FireOnMediaStartEvent();
+  return Status::OK;
 }
 
 Status MP4Muxer::Finalize() {
   DCHECK(segmenter_ != NULL);
-  return segmenter_->Finalize();
+  Status segmenter_finalized = segmenter_->Finalize();
+
+  if (!segmenter_finalized.ok())
+    return segmenter_finalized;
+
+  FireOnMediaEndEvent();
+  return Status::OK;
 }
 
 Status MP4Muxer::AddSample(const MediaStream* stream,
@@ -112,7 +136,7 @@ Status MP4Muxer::AddSample(const MediaStream* stream,
 }
 
 void MP4Muxer::InitializeTrak(const StreamInfo* info, Track* trak) {
-  uint64 now = IsoTimeNow();
+  int64 now = IsoTimeNow();
   trak->header.creation_time = now;
   trak->header.modification_time = now;
   trak->header.duration = 0;
@@ -216,5 +240,88 @@ void MP4Muxer::GenerateSinf(ProtectionSchemeInfo* sinf, FourCC old_type) {
   sinf->info.track_encryption.default_kid = encryptor_source()->key_id();
 }
 
+void MP4Muxer::GetStreamInfo(std::vector<StreamInfo*>* stream_infos) {
+  DCHECK(stream_infos);
+  const std::vector<MediaStream*>& media_stream_vec = streams();
+  stream_infos->reserve(media_stream_vec.size());
+  for (size_t i = 0; i < media_stream_vec.size(); ++i) {
+    stream_infos->push_back(media_stream_vec[i]->info().get());
+  }
+}
+
+bool MP4Muxer::GetInitRangeStartAndEnd(uint32* start, uint32* end) {
+  DCHECK(start && end);
+  size_t range_offset = 0;
+  size_t range_size = 0;
+  const bool has_range =
+      segmenter_->GetInitRange(&range_offset, &range_size);
+
+  if (!has_range)
+    return false;
+
+  SetStartAndEndFromOffsetAndSize(range_offset, range_size, start, end);
+  return true;
+}
+
+bool MP4Muxer::GetIndexRangeStartAndEnd(uint32* start, uint32* end) {
+  DCHECK(start && end);
+  size_t range_offset = 0;
+  size_t range_size = 0;
+  const bool has_range =
+      segmenter_->GetIndexRange(&range_offset, &range_size);
+
+  if (!has_range)
+    return false;
+
+  SetStartAndEndFromOffsetAndSize(range_offset, range_size, start, end);
+  return true;
+}
+
+void MP4Muxer::FireOnMediaStartEvent() {
+  if (!muxer_listener())
+    return;
+
+  std::vector<StreamInfo*> stream_info_vec;
+  GetStreamInfo(&stream_info_vec);
+  const uint32 timescale = segmenter_->GetReferenceTimeScale();
+  muxer_listener()->OnMediaStart(options(), stream_info_vec, timescale);
+}
+
+void MP4Muxer::FireOnMediaEndEvent() {
+  if (!muxer_listener())
+    return;
+
+  std::vector<StreamInfo*> stream_info_vec;
+  GetStreamInfo(&stream_info_vec);
+
+  uint32 init_range_start = 0;
+  uint32 init_range_end = 0;
+  const bool has_init_range =
+      GetInitRangeStartAndEnd(&init_range_start, &init_range_end);
+
+  uint32 index_range_start = 0;
+  uint32 index_range_end = 0;
+  const bool has_index_range =
+      GetIndexRangeStartAndEnd(&index_range_start, &index_range_end);
+
+  const float duration_seconds = static_cast<float>(segmenter_->GetDuration());
+
+  const int64 file_size = File::GetFileSize(options().output_file_name.c_str());
+  if (file_size <= 0) {
+    LOG(ERROR) << "Invalid file size: " << file_size;
+    return;
+  }
+
+  muxer_listener()->OnMediaEnd(stream_info_vec,
+                               has_init_range,
+                               init_range_start,
+                               init_range_end,
+                               has_index_range,
+                               index_range_start,
+                               index_range_end,
+                               duration_seconds,
+                               file_size);
+}
+
 }  // namespace mp4
 }  // namespace media
diff --git a/media/mp4/mp4_muxer.h b/media/mp4/mp4_muxer.h
index 044ce81068..7c79974e66 100644
--- a/media/mp4/mp4_muxer.h
+++ b/media/mp4/mp4_muxer.h
@@ -7,6 +7,8 @@
 #ifndef MEDIA_MP4_MP4_MUXER_H_
 #define MEDIA_MP4_MP4_MUXER_H_
 
+#include <vector>
+
 #include "media/base/muxer.h"
 #include "media/mp4/fourccs.h"
 
@@ -54,6 +56,21 @@ class MP4Muxer : public Muxer {
   // Should we enable encrytion?
   bool IsEncryptionRequired() { return (encryptor_source() != NULL); }
 
+  // Helper functions for events.
+  void GetStreamInfo(std::vector<StreamInfo*>* stream_infos);
+
+  // Gets |start| and |end| initialization range. Returns true if there is an
+  // init range and sets start-end byte-range-spec specified in RFC2616.
+  bool GetInitRangeStartAndEnd(uint32* start, uint32* end);
+
+  // Gets |start| and |end| index range. Returns true if there is an index range
+  // and sets start-end byte-range-spec specified in RFC2616.
+  bool GetIndexRangeStartAndEnd(uint32* start, uint32* end);
+
+  // Fire events if there are no errors and Muxer::muxer_listener() is not NULL.
+  void FireOnMediaStartEvent();
+  void FireOnMediaEndEvent();
+
   scoped_ptr<MP4Segmenter> segmenter_;
 
   DISALLOW_COPY_AND_ASSIGN(MP4Muxer);
diff --git a/media/mp4/mp4_segmenter.cc b/media/mp4/mp4_segmenter.cc
index a4a0b055e8..110f49eaa5 100644
--- a/media/mp4/mp4_segmenter.cc
+++ b/media/mp4/mp4_segmenter.cc
@@ -164,6 +164,19 @@ Status MP4Segmenter::AddSample(const MediaStream* stream,
   return Status::OK;
 }
 
+uint32 MP4Segmenter::GetReferenceTimeScale() const {
+  return moov_->header.timescale;
+}
+
+double MP4Segmenter::GetDuration() const {
+  if (moov_->header.timescale == 0) {
+    // Handling the case where this is not properly initialized.
+    return 0.0;
+  }
+
+  return static_cast<double>(moov_->header.duration) / moov_->header.timescale;
+}
+
 void MP4Segmenter::InitializeSegment() {
   sidx_->references.clear();
   end_of_segment_ = false;
diff --git a/media/mp4/mp4_segmenter.h b/media/mp4/mp4_segmenter.h
index 23036434ad..c70a5c8dee 100644
--- a/media/mp4/mp4_segmenter.h
+++ b/media/mp4/mp4_segmenter.h
@@ -47,6 +47,8 @@ class MP4Segmenter {
 
   // Initialize the segmenter. Caller retains the ownership of
   // |encryptor_source|. |encryptor_source| can be NULL.
+  // Calling other public methods of this class without this method returning
+  // Status::OK, results in an undefined behavior.
   virtual Status Initialize(EncryptorSource* encryptor_source,
                             double clear_lead_in_seconds,
                             const std::vector<MediaStream*>& streams);
@@ -56,6 +58,21 @@ class MP4Segmenter {
   virtual Status AddSample(const MediaStream* stream,
                            scoped_refptr<MediaSample> sample);
 
+  // Returns false if it does not apply.
+  // If it has an initialization byte range this returns true and set |offset|
+  // and |size|, otherwise returns false.
+  virtual bool GetInitRange(size_t* offset, size_t* size) = 0;
+
+  // Returns false if it does not apply.
+  // If it has an index byte range this returns true and set |offset| and
+  // |size|, otherwise returns false.
+  virtual bool GetIndexRange(size_t* offset, size_t* size) = 0;
+
+  uint32 GetReferenceTimeScale() const;
+
+  // Returns the total length, in seconds, of segmented media files.
+  double GetDuration() const;
+
  protected:
   void InitializeSegment();
   virtual Status FinalizeSegment();
diff --git a/media/mp4/mp4_vod_segmenter.cc b/media/mp4/mp4_vod_segmenter.cc
index 2bc8e2f2dd..de58078c6d 100644
--- a/media/mp4/mp4_vod_segmenter.cc
+++ b/media/mp4/mp4_vod_segmenter.cc
@@ -89,6 +89,21 @@ Status MP4VODSegmenter::Finalize() {
   return Status::OK;
 }
 
+bool MP4VODSegmenter::GetInitRange(size_t* offset, size_t* size) {
+  // In Finalize, ftyp and moov gets written first so offset must be 0.
+  *offset = 0;
+  *size = ftyp()->ComputeSize() + moov()->ComputeSize();
+  return true;
+}
+
+bool MP4VODSegmenter::GetIndexRange(size_t* offset, size_t* size) {
+  // Index range is right after init range so the offset must be the size of
+  // ftyp and moov.
+  *offset = ftyp()->ComputeSize() + moov()->ComputeSize();
+  *size = vod_sidx_->ComputeSize();
+  return true;
+}
+
 Status MP4VODSegmenter::FinalizeSegment() {
   Status status = MP4Segmenter::FinalizeSegment();
   if (!status.ok())
diff --git a/media/mp4/mp4_vod_segmenter.h b/media/mp4/mp4_vod_segmenter.h
index cb3b6ea05d..d4b7a70c2d 100644
--- a/media/mp4/mp4_vod_segmenter.h
+++ b/media/mp4/mp4_vod_segmenter.h
@@ -37,6 +37,9 @@ class MP4VODSegmenter : public MP4Segmenter {
                             const std::vector<MediaStream*>& streams) OVERRIDE;
   virtual Status Finalize() OVERRIDE;
 
+  virtual bool GetInitRange(size_t* offset, size_t* size) OVERRIDE;
+  virtual bool GetIndexRange(size_t* offset, size_t* size) OVERRIDE;
+
  protected:
   virtual Status FinalizeSegment() OVERRIDE;