diff --git a/packager/file/file.cc b/packager/file/file.cc
index 973f0ee8a2..8eef335d2a 100644
--- a/packager/file/file.cc
+++ b/packager/file/file.cc
@@ -35,11 +35,6 @@ ABSL_FLAG(uint64_t,
           1ULL << 16,
           "Size of the block size used for threaded I/O, in bytes.");
 
-// Needed for Windows weirdness which somewhere defines CopyFile as CopyFileW.
-#ifdef CopyFile
-#undef CopyFile
-#endif  // CopyFile
-
 namespace shaka {
 
 const char* kCallbackFilePrefix = "callback://";
@@ -360,17 +355,17 @@ bool File::Copy(const char* from_file_name, const char* to_file_name) {
   return true;
 }
 
-int64_t File::CopyFile(File* source, File* destination) {
-  return CopyFile(source, destination, kWholeFile);
+int64_t File::Copy(File* source, File* destination) {
+  return Copy(source, destination, kWholeFile);
 }
 
-int64_t File::CopyFile(File* source, File* destination, int64_t max_copy) {
+int64_t File::Copy(File* source, File* destination, int64_t max_copy) {
   DCHECK(source);
   DCHECK(destination);
   if (max_copy < 0)
     max_copy = std::numeric_limits<int64_t>::max();
 
-  VLOG(2) << "File::CopyFile from " << source->file_name() << " to "
+  VLOG(2) << "File::Copy from " << source->file_name() << " to "
           << destination->file_name();
 
   const int64_t kBufferSize = 0x40000;  // 256KB.
diff --git a/packager/file/file.h b/packager/file/file.h
index d006b33581..1f59401961 100644
--- a/packager/file/file.h
+++ b/packager/file/file.h
@@ -135,14 +135,14 @@ class SHAKA_EXPORT File {
   /// @param source The file to copy from.
   /// @param destination The file to copy to.
   /// @return Number of bytes written, or a value < 0 on error.
-  static int64_t CopyFile(File* source, File* destination);
+  static int64_t Copy(File* source, File* destination);
 
   /// Copies the contents from source to destination.
   /// @param source The file to copy from.
   /// @param destination The file to copy to.
   /// @param max_copy The maximum number of bytes to copy; < 0 to copy to EOF.
   /// @return Number of bytes written, or a value < 0 on error.
-  static int64_t CopyFile(File* source, File* destination, int64_t max_copy);
+  static int64_t Copy(File* source, File* destination, int64_t max_copy);
 
   /// @param file_name is the name of the file to be checked.
   /// @return true if `file_name` is a local and regular file.
diff --git a/packager/media/CMakeLists.txt b/packager/media/CMakeLists.txt
index 5190ce5a23..9fe1450345 100644
--- a/packager/media/CMakeLists.txt
+++ b/packager/media/CMakeLists.txt
@@ -10,3 +10,4 @@ add_subdirectory(origin)
 add_subdirectory(replicator)
 add_subdirectory(test)
 add_subdirectory(codecs)
+add_subdirectory(formats)
diff --git a/packager/media/base/media_parser.h b/packager/media/base/media_parser.h
index 7381b769ea..67ae7fef7a 100644
--- a/packager/media/base/media_parser.h
+++ b/packager/media/base/media_parser.h
@@ -7,10 +7,11 @@
 #ifndef PACKAGER_MEDIA_BASE_MEDIA_PARSER_H_
 #define PACKAGER_MEDIA_BASE_MEDIA_PARSER_H_
 
+#include <functional>
 #include <memory>
 #include <string>
 #include <vector>
-#include "packager/base/callback.h"
+
 #include "packager/macros.h"
 #include "packager/media/base/container_names.h"
 
@@ -30,7 +31,7 @@ class MediaParser {
   /// Called upon completion of parser initialization.
   /// @param stream_info contains the stream info of all the elementary streams
   ///        within this file.
-  typedef base::Callback<void(
+  typedef std::function<void(
       const std::vector<std::shared_ptr<StreamInfo> >& stream_info)>
       InitCB;
 
@@ -39,8 +40,8 @@ class MediaParser {
   /// @param media_sample is the new media sample.
   /// @return true if the sample is accepted, false if something was wrong
   ///         with the sample and a parsing error should be signaled.
-  typedef base::Callback<bool(uint32_t track_id,
-                              std::shared_ptr<MediaSample> media_sample)>
+  typedef std::function<bool(uint32_t track_id,
+                             std::shared_ptr<MediaSample> media_sample)>
       NewMediaSampleCB;
 
   /// Called when a new text sample has been parsed.
@@ -48,8 +49,8 @@ class MediaParser {
   /// @param text_sample is the new text sample.
   /// @return true if the sample is accepted, false if something was wrong
   ///         with the sample and a parsing error should be signaled.
-  typedef base::Callback<bool(uint32_t track_id,
-                              std::shared_ptr<TextSample> text_sample)>
+  typedef std::function<bool(uint32_t track_id,
+                             std::shared_ptr<TextSample> text_sample)>
       NewTextSampleCB;
 
   /// Initialize the parser with necessary callbacks. Must be called before any
@@ -70,11 +71,11 @@ class MediaParser {
   /// Flush data currently in the parser and put the parser in a state where it
   /// can receive data for a new seek point.
   /// @return true if successful, false otherwise.
-  virtual bool Flush() WARN_UNUSED_RESULT = 0;
+  [[nodiscard]] virtual bool Flush() = 0;
 
   /// Should be called when there is new data to parse.
   /// @return true if successful.
-  virtual bool Parse(const uint8_t* buf, int size) WARN_UNUSED_RESULT = 0;
+  [[nodiscard]] virtual bool Parse(const uint8_t* buf, int size) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaParser);
diff --git a/packager/media/base/text_track.h b/packager/media/base/text_track.h
index 30c68f57bd..e803d6d6d1 100644
--- a/packager/media/base/text_track.h
+++ b/packager/media/base/text_track.h
@@ -8,9 +8,6 @@
 #include <memory>
 #include <string>
 
-#include "packager/base/callback.h"
-#include "packager/base/time/time.h"
-
 namespace shaka {
 namespace media {
 
@@ -33,9 +30,9 @@ class TextTrack {
                             const std::string& settings) = 0;
 };
 
-typedef base::Callback<std::unique_ptr<TextTrack>(TextKind kind,
-                                                  const std::string& label,
-                                                  const std::string& language)>
+typedef std::function<std::unique_ptr<TextTrack>(TextKind kind,
+                                                 const std::string& label,
+                                                 const std::string& language)>
     AddTextTrackCB;
 
 }  // namespace media
diff --git a/packager/media/formats/CMakeLists.txt b/packager/media/formats/CMakeLists.txt
new file mode 100644
index 0000000000..956084ff6c
--- /dev/null
+++ b/packager/media/formats/CMakeLists.txt
@@ -0,0 +1,8 @@
+# Copyright 2022 Google LLC. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+# Subdirectories with their own CMakeLists.txt, all of whose targets are built.
+add_subdirectory(webm)
diff --git a/packager/media/formats/webm/CMakeLists.txt b/packager/media/formats/webm/CMakeLists.txt
new file mode 100644
index 0000000000..ac44a33411
--- /dev/null
+++ b/packager/media/formats/webm/CMakeLists.txt
@@ -0,0 +1,60 @@
+# Copyright 2022 Google LLC. All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+add_library(formats_webm STATIC
+    encryptor.cc
+    mkv_writer.cc
+    multi_segment_segmenter.cc
+    seek_head.cc
+    segmenter.cc
+    single_segment_segmenter.cc
+    two_pass_single_segment_segmenter.cc
+    webm_audio_client.cc
+    webm_cluster_parser.cc
+    webm_constants.cc
+    webm_content_encodings.cc
+    webm_content_encodings_client.cc
+    webm_crypto_helpers.cc
+    webm_info_parser.cc
+    webm_parser.cc
+    webm_media_parser.cc
+    webm_muxer.cc
+    webm_tracks_parser.cc
+    webm_video_client.cc
+    webm_webvtt_parser.cc
+)
+
+target_link_libraries(formats_webm
+    webm
+    file
+    media_base
+    codecs
+)
+
+add_executable(webm_unittest
+    cluster_builder.cc
+    encrypted_segmenter_unittest.cc
+    encryptor_unittest.cc
+    multi_segment_segmenter_unittest.cc
+    segmenter_test_base.cc
+    single_segment_segmenter_unittest.cc
+    tracks_builder.cc
+    webm_cluster_parser_unittest.cc
+    webm_content_encodings_client_unittest.cc
+    webm_parser_unittest.cc
+    webm_tracks_parser_unittest.cc
+    webm_webvtt_parser_unittest.cc
+)
+
+target_link_libraries(webm_unittest
+    formats_webm
+    gmock
+    gtest
+    gtest_main
+    test_data_util
+)
+
+add_test(NAME webm_unittest COMMAND webm_unittest)
diff --git a/packager/media/formats/webm/cluster_builder.cc b/packager/media/formats/webm/cluster_builder.cc
index 939a92db71..372e80592f 100644
--- a/packager/media/formats/webm/cluster_builder.cc
+++ b/packager/media/formats/webm/cluster_builder.cc
@@ -4,7 +4,7 @@
 
 #include "packager/media/formats/webm/cluster_builder.h"
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace shaka {
diff --git a/packager/media/formats/webm/cluster_builder.h b/packager/media/formats/webm/cluster_builder.h
index 83269016c8..56980e4805 100644
--- a/packager/media/formats/webm/cluster_builder.h
+++ b/packager/media/formats/webm/cluster_builder.h
@@ -6,9 +6,10 @@
 #define PACKAGER_MEDIA_FORMATS_WEBM_CLUSTER_BUILDER_H_
 
 #include <stdint.h>
+
 #include <memory>
 
-#include "packager/base/macros.h"
+#include "packager/macros.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/encrypted_segmenter_unittest.cc b/packager/media/formats/webm/encrypted_segmenter_unittest.cc
index 3982b58b58..07c786bca0 100644
--- a/packager/media/formats/webm/encrypted_segmenter_unittest.cc
+++ b/packager/media/formats/webm/encrypted_segmenter_unittest.cc
@@ -64,9 +64,9 @@ const uint8_t kBasicSupportData[] = {
       0x2a, 0xd7, 0xb1, 0x83, 0x0f, 0x42, 0x40,
       // Duration: float(5000)
       0x44, 0x89, 0x84, 0x45, 0x9c, 0x40, 0x00,
-      // MuxingApp: 'libwebm-0.2.1.0'
+      // MuxingApp: 'libwebm-0.3.0.0'
       0x4d, 0x80, 0x8f, 0x6c, 0x69, 0x62, 0x77, 0x65, 0x62, 0x6d, 0x2d, 0x30,
-      0x2e, 0x32, 0x2e, 0x31, 0x2e, 0x30,
+      0x2e, 0x33, 0x2e, 0x30, 0x2e, 0x30,
       // WritingApp: 'https://github.com/shaka-project/shaka-packager version test'
       0x57, 0x41, 0xbc,
       0x68, 0x74, 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x67, 0x69, 0x74, 0x68,
diff --git a/packager/media/formats/webm/encryptor.h b/packager/media/formats/webm/encryptor.h
index bddfabdb75..cb6ceecb00 100644
--- a/packager/media/formats/webm/encryptor.h
+++ b/packager/media/formats/webm/encryptor.h
@@ -9,8 +9,8 @@
 
 #include <vector>
 
-#include "packager/status.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
+#include "mkvmuxer/mkvmuxer.h"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/encryptor_unittest.cc b/packager/media/formats/webm/encryptor_unittest.cc
index 98b26f69ae..e1b9870bf0 100644
--- a/packager/media/formats/webm/encryptor_unittest.cc
+++ b/packager/media/formats/webm/encryptor_unittest.cc
@@ -7,10 +7,12 @@
 #include "packager/media/formats/webm/encryptor.h"
 
 #include <gtest/gtest.h>
+
 #include <memory>
+
 #include "packager/media/base/media_sample.h"
 #include "packager/media/formats/webm/webm_constants.h"
-#include "packager/status_test_util.h"
+#include "packager/status/status_test_util.h"
 
 namespace shaka {
 namespace media {
@@ -139,14 +141,14 @@ namespace {
 EncryptionTestCase kEncryptionTestCases[] = {
     // Special case with no subsamples.
     {nullptr, 0, nullptr, 0},
-    {kSubsamples1, arraysize(kSubsamples1), kSubsamplePartitionData1,
-     arraysize(kSubsamplePartitionData1)},
-    {kSubsamples2, arraysize(kSubsamples2), kSubsamplePartitionData2,
-     arraysize(kSubsamplePartitionData2)},
-    {kSubsamples3, arraysize(kSubsamples3), kSubsamplePartitionData3,
-     arraysize(kSubsamplePartitionData3)},
-    {kSubsamples4, arraysize(kSubsamples4), kSubsamplePartitionData4,
-     arraysize(kSubsamplePartitionData4)},
+    {kSubsamples1, std::size(kSubsamples1), kSubsamplePartitionData1,
+     std::size(kSubsamplePartitionData1)},
+    {kSubsamples2, std::size(kSubsamples2), kSubsamplePartitionData2,
+     std::size(kSubsamplePartitionData2)},
+    {kSubsamples3, std::size(kSubsamples3), kSubsamplePartitionData3,
+     std::size(kSubsamplePartitionData3)},
+    {kSubsamples4, std::size(kSubsamples4), kSubsamplePartitionData4,
+     std::size(kSubsamplePartitionData4)},
 };
 }  // namespace
 
diff --git a/packager/media/formats/webm/mkv_writer.cc b/packager/media/formats/webm/mkv_writer.cc
index b7ef56e049..4225b727d9 100644
--- a/packager/media/formats/webm/mkv_writer.cc
+++ b/packager/media/formats/webm/mkv_writer.cc
@@ -63,7 +63,7 @@ int64_t MkvWriter::WriteFromFile(File* source) {
 int64_t MkvWriter::WriteFromFile(File* source, int64_t max_copy) {
   DCHECK(file_);
 
-  const int64_t size = File::CopyFile(source, file_.get(), max_copy);
+  const int64_t size = File::Copy(source, file_.get(), max_copy);
   if (size < 0)
     return size;
 
@@ -90,8 +90,8 @@ bool MkvWriter::Seekable() const {
   return seekable_;
 }
 
-void MkvWriter::ElementStartNotify(mkvmuxer::uint64 element_id,
-                                   mkvmuxer::int64 position) {}
+void MkvWriter::ElementStartNotify(mkvmuxer::uint64 /*element_id*/,
+                                   mkvmuxer::int64 /*position*/) {}
 
 }  // namespace media
 }  // namespace shaka
diff --git a/packager/media/formats/webm/mkv_writer.h b/packager/media/formats/webm/mkv_writer.h
index 8549c289c4..70a97e15f9 100644
--- a/packager/media/formats/webm/mkv_writer.h
+++ b/packager/media/formats/webm/mkv_writer.h
@@ -10,9 +10,9 @@
 #include <memory>
 #include <string>
 
+#include "mkvmuxer/mkvmuxer.h"
 #include "packager/file/file_closer.h"
-#include "packager/status.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/multi_segment_segmenter.cc b/packager/media/formats/webm/multi_segment_segmenter.cc
index 882279f0bb..66de2c3928 100644
--- a/packager/media/formats/webm/multi_segment_segmenter.cc
+++ b/packager/media/formats/webm/multi_segment_segmenter.cc
@@ -6,12 +6,12 @@
 
 #include "packager/media/formats/webm/multi_segment_segmenter.h"
 
+#include "mkvmuxer/mkvmuxer.h"
 #include "packager/media/base/muxer_options.h"
 #include "packager/media/base/muxer_util.h"
 #include "packager/media/base/stream_info.h"
 #include "packager/media/event/muxer_listener.h"
-#include "packager/status_macros.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
+#include "packager/status/status_macros.h"
 
 namespace shaka {
 namespace media {
@@ -58,13 +58,13 @@ Status MultiSegmentSegmenter::FinalizeSegment(int64_t start_timestamp,
   return Status::OK;
 }
 
-bool MultiSegmentSegmenter::GetInitRangeStartAndEnd(uint64_t* start,
-                                                    uint64_t* end) {
+bool MultiSegmentSegmenter::GetInitRangeStartAndEnd(uint64_t* /*start*/,
+                                                    uint64_t* /*end*/) {
   return false;
 }
 
-bool MultiSegmentSegmenter::GetIndexRangeStartAndEnd(uint64_t* start,
-                                                     uint64_t* end) {
+bool MultiSegmentSegmenter::GetIndexRangeStartAndEnd(uint64_t* /*start*/,
+                                                     uint64_t* /*end*/) {
   return false;
 }
 
diff --git a/packager/media/formats/webm/multi_segment_segmenter.h b/packager/media/formats/webm/multi_segment_segmenter.h
index 78f14b842e..0dc0c1ab37 100644
--- a/packager/media/formats/webm/multi_segment_segmenter.h
+++ b/packager/media/formats/webm/multi_segment_segmenter.h
@@ -11,7 +11,7 @@
 
 #include "packager/media/formats/webm/mkv_writer.h"
 #include "packager/media/formats/webm/segmenter.h"
-#include "packager/status.h"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/multi_segment_segmenter_unittest.cc b/packager/media/formats/webm/multi_segment_segmenter_unittest.cc
index 9acaab67bb..815a4499ba 100644
--- a/packager/media/formats/webm/multi_segment_segmenter_unittest.cc
+++ b/packager/media/formats/webm/multi_segment_segmenter_unittest.cc
@@ -35,9 +35,9 @@ const uint8_t kBasicSupportDataInit[] = {
     0x15, 0x49, 0xa9, 0x66, 0xd8,
       // TimecodeScale: 1000000
       0x2a, 0xd7, 0xb1, 0x83, 0x0f, 0x42, 0x40,
-      // MuxingApp: 'libwebm-0.2.1.0'
+      // MuxingApp: 'libwebm-0.3.0.0'
       0x4d, 0x80, 0x8f, 0x6c, 0x69, 0x62, 0x77, 0x65, 0x62, 0x6d, 0x2d, 0x30,
-      0x2e, 0x32, 0x2e, 0x31, 0x2e, 0x30,
+      0x2e, 0x33, 0x2e, 0x30, 0x2e, 0x30,
       // WritingApp: 'https://github.com/shaka-project/shaka-packager version test'
       0x57, 0x41, 0xbc,
       0x68, 0x74, 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x67, 0x69, 0x74, 0x68,
diff --git a/packager/media/formats/webm/seek_head.cc b/packager/media/formats/webm/seek_head.cc
index a1dd2afc50..1e745950ef 100644
--- a/packager/media/formats/webm/seek_head.cc
+++ b/packager/media/formats/webm/seek_head.cc
@@ -9,9 +9,11 @@
 #include <algorithm>
 #include <limits>
 
-#include "packager/base/logging.h"
-#include "packager/third_party/libwebm/src/mkvmuxerutil.hpp"
-#include "packager/third_party/libwebm/src/webmids.hpp"
+#include "common/webmids.h"
+#include "glog/logging.h"
+#include "mkvmuxer/mkvmuxerutil.h"
+
+using namespace mkvmuxer;
 
 namespace shaka {
 namespace media {
@@ -20,18 +22,19 @@ namespace {
 // Cluster, Cues, Info, Tracks.
 const size_t kElementIdCount = 4u;
 
-uint64_t EbmlMasterElementWithPayloadSize(mkvmuxer::MkvId id, uint64_t payload_size) {
+uint64_t EbmlMasterElementWithPayloadSize(libwebm::MkvId id,
+                                          uint64_t payload_size) {
   return EbmlMasterElementSize(id, payload_size) + payload_size;
 }
 
 uint64_t MaxSeekEntrySize() {
   const uint64_t max_entry_payload_size =
       EbmlElementSize(
-          mkvmuxer::kMkvSeekID,
+          libwebm::kMkvSeekID,
           static_cast<mkvmuxer::uint64>(std::numeric_limits<uint32_t>::max())) +
-      EbmlElementSize(mkvmuxer::kMkvSeekPosition,
+      EbmlElementSize(libwebm::kMkvSeekPosition,
                       std::numeric_limits<mkvmuxer::uint64>::max());
-  return EbmlMasterElementWithPayloadSize(mkvmuxer::kMkvSeek,
+  return EbmlMasterElementWithPayloadSize(libwebm::kMkvSeek,
                                           max_entry_payload_size);
 }
 
@@ -39,7 +42,7 @@ uint64_t MaxSeekEntrySize() {
 
 SeekHead::SeekHead()
     : total_void_size_(EbmlMasterElementWithPayloadSize(
-          mkvmuxer::kMkvSeekHead,
+          libwebm::kMkvSeekHead,
           kElementIdCount * MaxSeekEntrySize())) {}
 
 SeekHead::~SeekHead() {}
@@ -52,17 +55,17 @@ bool SeekHead::Write(mkvmuxer::IMkvWriter* writer) {
   uint64_t payload_size = 0;
   for (const SeekHead::SeekElement& seek_element : seek_elements) {
     payload_size +=
-        EbmlMasterElementWithPayloadSize(mkvmuxer::kMkvSeek, seek_element.size);
+        EbmlMasterElementWithPayloadSize(libwebm::kMkvSeek, seek_element.size);
   }
 
   const int64_t start_pos = writer->Position();
-  if (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeekHead, payload_size))
+  if (!WriteEbmlMasterElement(writer, libwebm::kMkvSeekHead, payload_size))
     return false;
 
   for (const SeekHead::SeekElement& element : seek_elements) {
-    if (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeek, element.size) ||
-        !WriteEbmlElement(writer, mkvmuxer::kMkvSeekID, element.id) ||
-        !WriteEbmlElement(writer, mkvmuxer::kMkvSeekPosition, element.position))
+    if (!WriteEbmlMasterElement(writer, libwebm::kMkvSeek, element.size) ||
+        !WriteEbmlElement(writer, libwebm::kMkvSeekID, element.id) ||
+        !WriteEbmlElement(writer, libwebm::kMkvSeekPosition, element.position))
       return false;
   }
 
@@ -88,13 +91,13 @@ bool SeekHead::WriteVoid(mkvmuxer::IMkvWriter* writer) {
 std::vector<SeekHead::SeekElement> SeekHead::CreateSeekElements() {
   std::vector<SeekHead::SeekElement> seek_elements;
   if (info_pos_ != 0)
-    seek_elements.emplace_back(mkvmuxer::kMkvInfo, info_pos_);
+    seek_elements.emplace_back(libwebm::kMkvInfo, info_pos_);
   if (tracks_pos_ != 0)
-    seek_elements.emplace_back(mkvmuxer::kMkvTracks, tracks_pos_);
+    seek_elements.emplace_back(libwebm::kMkvTracks, tracks_pos_);
   if (cues_pos_ != 0)
-    seek_elements.emplace_back(mkvmuxer::kMkvCues, cues_pos_);
+    seek_elements.emplace_back(libwebm::kMkvCues, cues_pos_);
   if (cluster_pos_ != 0)
-    seek_elements.emplace_back(mkvmuxer::kMkvCluster, cluster_pos_);
+    seek_elements.emplace_back(libwebm::kMkvCluster, cluster_pos_);
   DCHECK_LE(seek_elements.size(), kElementIdCount);
 
   std::sort(seek_elements.begin(), seek_elements.end(),
@@ -103,9 +106,8 @@ std::vector<SeekHead::SeekElement> SeekHead::CreateSeekElements() {
               return left.position < right.position;
             });
   for (SeekHead::SeekElement& element : seek_elements) {
-    element.size =
-        EbmlElementSize(mkvmuxer::kMkvSeekID, element.id) +
-        EbmlElementSize(mkvmuxer::kMkvSeekPosition, element.position);
+    element.size = EbmlElementSize(libwebm::kMkvSeekID, element.id) +
+                   EbmlElementSize(libwebm::kMkvSeekPosition, element.position);
   }
   return seek_elements;
 }
diff --git a/packager/media/formats/webm/seek_head.h b/packager/media/formats/webm/seek_head.h
index c0432d07c1..9b58c2ec63 100644
--- a/packager/media/formats/webm/seek_head.h
+++ b/packager/media/formats/webm/seek_head.h
@@ -8,9 +8,10 @@
 #define PACKAGER_MEDIA_FORMATS_WEBM_SEEK_HEAD_H_
 
 #include <stdint.h>
+
 #include <vector>
 
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
+#include "mkvmuxer/mkvmuxer.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/segmenter.cc b/packager/media/formats/webm/segmenter.cc
index ab9e7a485b..3b47bd1f31 100644
--- a/packager/media/formats/webm/segmenter.cc
+++ b/packager/media/formats/webm/segmenter.cc
@@ -6,7 +6,8 @@
 
 #include "packager/media/formats/webm/segmenter.h"
 
-#include "packager/base/time/time.h"
+#include "common/webmids.h"
+#include "mkvmuxer/mkvmuxerutil.h"
 #include "packager/media/base/audio_stream_info.h"
 #include "packager/media/base/media_handler.h"
 #include "packager/media/base/media_sample.h"
@@ -19,8 +20,6 @@
 #include "packager/media/event/progress_listener.h"
 #include "packager/media/formats/webm/encryptor.h"
 #include "packager/media/formats/webm/webm_constants.h"
-#include "packager/third_party/libwebm/src/mkvmuxerutil.hpp"
-#include "packager/third_party/libwebm/src/webmids.hpp"
 #include "packager/version/version.h"
 
 using mkvmuxer::AudioTrack;
@@ -194,8 +193,8 @@ Status Segmenter::AddSample(const MediaSample& source_sample) {
   return Status::OK;
 }
 
-Status Segmenter::FinalizeSegment(int64_t start_timestamp,
-                                  int64_t duration_timestamp,
+Status Segmenter::FinalizeSegment(int64_t /*start_timestamp*/,
+                                  int64_t /*duration_timestamp*/,
                                   bool is_subsegment) {
   if (is_subsegment)
     new_subsegment_ = true;
@@ -228,7 +227,7 @@ Status Segmenter::WriteSegmentHeader(uint64_t file_size, MkvWriter* writer) {
   if (!WriteEbmlHeader(writer))
     return error_status;
 
-  if (WriteID(writer, mkvmuxer::kMkvSegment) != 0)
+  if (WriteID(writer, libwebm::kMkvSegment) != 0)
     return error_status;
 
   const uint64_t segment_size_size = 8;
diff --git a/packager/media/formats/webm/segmenter.h b/packager/media/formats/webm/segmenter.h
index 943c5225b8..7fa0b920aa 100644
--- a/packager/media/formats/webm/segmenter.h
+++ b/packager/media/formats/webm/segmenter.h
@@ -9,12 +9,11 @@
 
 #include <memory>
 
-#include "packager/base/optional.h"
+#include "mkvmuxer/mkvmuxer.h"
 #include "packager/media/base/range.h"
 #include "packager/media/formats/webm/mkv_writer.h"
 #include "packager/media/formats/webm/seek_head.h"
-#include "packager/status.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/segmenter_test_base.cc b/packager/media/formats/webm/segmenter_test_base.cc
index e024fd71b4..616c4a4a2b 100644
--- a/packager/media/formats/webm/segmenter_test_base.cc
+++ b/packager/media/formats/webm/segmenter_test_base.cc
@@ -182,13 +182,13 @@ bool SegmentTestBase::ClusterParser::OnUInt(int id, int64_t val) {
   return true;
 }
 
-bool SegmentTestBase::ClusterParser::OnFloat(int id, double val) {
+bool SegmentTestBase::ClusterParser::OnFloat(int /*id*/, double /*val*/) {
   return true;
 }
 
 bool SegmentTestBase::ClusterParser::OnBinary(int id,
                                               const uint8_t* data,
-                                              int size) {
+                                              int /*size*/) {
   if (in_cluster_ && (id == kWebMIdSimpleBlock || id == kWebMIdBlock)) {
     if (cluster_timecode_ == -1) {
       LOG(WARNING) << "Cluster timecode not yet available";
@@ -201,7 +201,8 @@ bool SegmentTestBase::ClusterParser::OnBinary(int id,
   return true;
 }
 
-bool SegmentTestBase::ClusterParser::OnString(int id, const std::string& str) {
+bool SegmentTestBase::ClusterParser::OnString(int /*id*/,
+                                              const std::string& /*str*/) {
   return true;
 }
 
diff --git a/packager/media/formats/webm/segmenter_test_base.h b/packager/media/formats/webm/segmenter_test_base.h
index c17292384c..c405bf0207 100644
--- a/packager/media/formats/webm/segmenter_test_base.h
+++ b/packager/media/formats/webm/segmenter_test_base.h
@@ -19,8 +19,8 @@
 #include "packager/media/formats/webm/mkv_writer.h"
 #include "packager/media/formats/webm/segmenter.h"
 #include "packager/media/formats/webm/webm_parser.h"
-#include "packager/status.h"
-#include "packager/status_test_util.h"
+#include "packager/status/status.h"
+#include "packager/status/status_test_util.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/single_segment_segmenter.cc b/packager/media/formats/webm/single_segment_segmenter.cc
index dba3b504d9..e79a136749 100644
--- a/packager/media/formats/webm/single_segment_segmenter.cc
+++ b/packager/media/formats/webm/single_segment_segmenter.cc
@@ -6,9 +6,9 @@
 
 #include "packager/media/formats/webm/single_segment_segmenter.h"
 
+#include "mkvmuxer/mkvmuxer.h"
 #include "packager/media/base/muxer_options.h"
 #include "packager/media/event/muxer_listener.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/single_segment_segmenter.h b/packager/media/formats/webm/single_segment_segmenter.h
index f0eb4c7503..6bfb25d493 100644
--- a/packager/media/formats/webm/single_segment_segmenter.h
+++ b/packager/media/formats/webm/single_segment_segmenter.h
@@ -7,11 +7,11 @@
 #ifndef PACKAGER_MEDIA_FORMATS_WEBM_SINGLE_SEGMENT_SEGMENTER_H_
 #define PACKAGER_MEDIA_FORMATS_WEBM_SINGLE_SEGMENT_SEGMENTER_H_
 
-#include "packager/media/formats/webm/segmenter.h"
-
 #include <memory>
+
 #include "packager/media/formats/webm/mkv_writer.h"
-#include "packager/status.h"
+#include "packager/media/formats/webm/segmenter.h"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/single_segment_segmenter_unittest.cc b/packager/media/formats/webm/single_segment_segmenter_unittest.cc
index 8074f9c8ab..3a39e01a01 100644
--- a/packager/media/formats/webm/single_segment_segmenter_unittest.cc
+++ b/packager/media/formats/webm/single_segment_segmenter_unittest.cc
@@ -59,9 +59,9 @@ const uint8_t kBasicSupportData[] = {
       0x2a, 0xd7, 0xb1, 0x83, 0x0f, 0x42, 0x40,
       // Duration: float(5000)
       0x44, 0x89, 0x84, 0x45, 0x9c, 0x40, 0x00,
-      // MuxingApp: 'libwebm-0.2.1.0'
+      // MuxingApp: 'libwebm-0.3.0.0'
       0x4d, 0x80, 0x8f, 0x6c, 0x69, 0x62, 0x77, 0x65, 0x62, 0x6d, 0x2d, 0x30,
-      0x2e, 0x32, 0x2e, 0x31, 0x2e, 0x30,
+      0x2e, 0x33, 0x2e, 0x30, 0x2e, 0x30,
       // WritingApp: 'https://github.com/shaka-project/shaka-packager version test'
       0x57, 0x41, 0xbc,
       0x68, 0x74, 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x67, 0x69, 0x74, 0x68,
diff --git a/packager/media/formats/webm/tracks_builder.cc b/packager/media/formats/webm/tracks_builder.cc
index 3eb19874af..f3dbeec7a1 100644
--- a/packager/media/formats/webm/tracks_builder.cc
+++ b/packager/media/formats/webm/tracks_builder.cc
@@ -4,7 +4,7 @@
 
 #include "packager/media/formats/webm/tracks_builder.h"
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace shaka {
diff --git a/packager/media/formats/webm/tracks_builder.h b/packager/media/formats/webm/tracks_builder.h
index 87ca4cb5e8..3e9595a013 100644
--- a/packager/media/formats/webm/tracks_builder.h
+++ b/packager/media/formats/webm/tracks_builder.h
@@ -11,7 +11,7 @@
 #include <string>
 #include <vector>
 
-#include "packager/base/macros.h"
+#include "packager/macros.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/two_pass_single_segment_segmenter.cc b/packager/media/formats/webm/two_pass_single_segment_segmenter.cc
index 4598a88968..af08e923d1 100644
--- a/packager/media/formats/webm/two_pass_single_segment_segmenter.cc
+++ b/packager/media/formats/webm/two_pass_single_segment_segmenter.cc
@@ -8,13 +8,13 @@
 
 #include <algorithm>
 
+#include "common/webmids.h"
+#include "mkvmuxer/mkvmuxer.h"
+#include "mkvmuxer/mkvmuxerutil.h"
 #include "packager/file/file_util.h"
 #include "packager/media/base/media_sample.h"
 #include "packager/media/base/muxer_options.h"
 #include "packager/media/base/stream_info.h"
-#include "packager/third_party/libwebm/src/mkvmuxer.hpp"
-#include "packager/third_party/libwebm/src/mkvmuxerutil.hpp"
-#include "packager/third_party/libwebm/src/webmids.hpp"
 
 namespace shaka {
 namespace media {
@@ -141,7 +141,7 @@ bool TwoPassSingleSegmentSegmenter::CopyFileWithClusterRewrite(
     File* source,
     MkvWriter* dest,
     uint64_t last_size) {
-  const int cluster_id_size = mkvmuxer::GetUIntSize(mkvmuxer::kMkvCluster);
+  const int cluster_id_size = mkvmuxer::GetUIntSize(libwebm::kMkvCluster);
   const int cluster_size_size = 8;  // The size of the Cluster size integer.
   const int cluster_header_size = cluster_id_size + cluster_size_size;
 
diff --git a/packager/media/formats/webm/two_pass_single_segment_segmenter.h b/packager/media/formats/webm/two_pass_single_segment_segmenter.h
index c55f58ceba..5bf584058f 100644
--- a/packager/media/formats/webm/two_pass_single_segment_segmenter.h
+++ b/packager/media/formats/webm/two_pass_single_segment_segmenter.h
@@ -12,7 +12,7 @@
 
 #include "packager/media/formats/webm/mkv_writer.h"
 #include "packager/media/formats/webm/single_segment_segmenter.h"
-#include "packager/status.h"
+#include "packager/status/status.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/webm.gyp b/packager/media/formats/webm/webm.gyp
deleted file mode 100644
index 5581c3a3e8..0000000000
--- a/packager/media/formats/webm/webm.gyp
+++ /dev/null
@@ -1,95 +0,0 @@
-# Copyright 2015 Google LLC. All rights reserved.
-#
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file or at
-# https://developers.google.com/open-source/licenses/bsd
-
-{
-  'variables': {
-    'shaka_code': 1,
-  },
-  'targets': [
-    {
-      'target_name': 'webm',
-      'type': '<(component)',
-      'sources': [
-        'encryptor.cc',
-        'encryptor.h',
-        'mkv_writer.cc',
-        'mkv_writer.h',
-        'multi_segment_segmenter.cc',
-        'multi_segment_segmenter.h',
-        'seek_head.cc',
-        'seek_head.h',
-        'segmenter.cc',
-        'segmenter.h',
-        'single_segment_segmenter.cc',
-        'single_segment_segmenter.h',
-        'two_pass_single_segment_segmenter.cc',
-        'two_pass_single_segment_segmenter.h',
-        'webm_audio_client.cc',
-        'webm_audio_client.h',
-        'webm_cluster_parser.cc',
-        'webm_cluster_parser.h',
-        'webm_constants.cc',
-        'webm_constants.h',
-        'webm_content_encodings.cc',
-        'webm_content_encodings.h',
-        'webm_content_encodings_client.cc',
-        'webm_content_encodings_client.h',
-        'webm_crypto_helpers.cc',
-        'webm_crypto_helpers.h',
-        'webm_info_parser.cc',
-        'webm_info_parser.h',
-        'webm_parser.cc',
-        'webm_parser.h',
-        'webm_media_parser.cc',
-        'webm_media_parser.h',
-        'webm_muxer.cc',
-        'webm_muxer.h',
-        'webm_tracks_parser.cc',
-        'webm_tracks_parser.h',
-        'webm_video_client.cc',
-        'webm_video_client.h',
-        'webm_webvtt_parser.cc',
-        'webm_webvtt_parser.h'
-      ],
-      'dependencies': [
-        '../../../third_party/boringssl/boringssl.gyp:boringssl',
-        '../../../third_party/gflags/gflags.gyp:gflags',
-        '../../../third_party/libwebm/libwebm.gyp:mkvmuxer',
-        '../../base/media_base.gyp:media_base',
-        '../../codecs/codecs.gyp:codecs'
-      ],
-    },
-    {
-      'target_name': 'webm_unittest',
-      'type': '<(gtest_target_type)',
-      'sources': [
-        'cluster_builder.cc',
-        'cluster_builder.h',
-        'encrypted_segmenter_unittest.cc',
-        'encryptor_unittest.cc',
-        'multi_segment_segmenter_unittest.cc',
-        'segmenter_test_base.cc',
-        'segmenter_test_base.h',
-        'single_segment_segmenter_unittest.cc',
-        'tracks_builder.cc',
-        'tracks_builder.h',
-        'webm_cluster_parser_unittest.cc',
-        'webm_content_encodings_client_unittest.cc',
-        'webm_parser_unittest.cc',
-        'webm_tracks_parser_unittest.cc',
-        'webm_webvtt_parser_unittest.cc',
-      ],
-      'dependencies': [
-        '../../../file/file.gyp:file',
-        '../../../testing/gtest.gyp:gtest',
-        '../../../testing/gmock.gyp:gmock',
-        '../../../third_party/libwebm/libwebm.gyp:mkvmuxer',
-        '../../test/media_test.gyp:media_test_support',
-        'webm',
-      ]
-    },
-  ],
-}
diff --git a/packager/media/formats/webm/webm_audio_client.cc b/packager/media/formats/webm/webm_audio_client.cc
index 6c86cecfca..aea0aa011e 100644
--- a/packager/media/formats/webm/webm_audio_client.cc
+++ b/packager/media/formats/webm/webm_audio_client.cc
@@ -4,7 +4,7 @@
 
 #include "packager/media/formats/webm/webm_audio_client.h"
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace {
diff --git a/packager/media/formats/webm/webm_cluster_parser.cc b/packager/media/formats/webm/webm_cluster_parser.cc
index 0afffa0e8c..15646fb72b 100644
--- a/packager/media/formats/webm/webm_cluster_parser.cc
+++ b/packager/media/formats/webm/webm_cluster_parser.cc
@@ -7,8 +7,8 @@
 #include <algorithm>
 #include <vector>
 
-#include "packager/base/logging.h"
-#include "packager/base/sys_byteorder.h"
+#include "absl/base/internal/endian.h"
+#include "glog/logging.h"
 #include "packager/media/base/decrypt_config.h"
 #include "packager/media/base/timestamp.h"
 #include "packager/media/codecs/vp8_parser.h"
@@ -259,7 +259,7 @@ bool WebMClusterParser::OnBinary(int id, const uint8_t* data, int size) {
       return true;
 
     case kWebMIdBlockAdditional: {
-      uint64_t block_add_id = base::HostToNet64(block_add_id_);
+      uint64_t block_add_id = absl::big_endian::FromHost64(block_add_id_);
       if (block_additional_data_) {
         // TODO: Technically, more than 1 BlockAdditional is allowed as per
         // matroska spec. But for now we don't have a use case to support
@@ -310,7 +310,7 @@ bool WebMClusterParser::OnBlock(bool is_simple_block,
                                 int size,
                                 const uint8_t* additional,
                                 int additional_size,
-                                int64_t discard_padding,
+                                int64_t /*discard_padding*/,
                                 bool is_key_frame) {
   DCHECK_GE(size, 0);
   if (cluster_timecode_ == -1) {
@@ -427,7 +427,7 @@ bool WebMClusterParser::OnBlock(bool is_simple_block,
                            ? (block_duration * timecode_multiplier_)
                            : kNoTimestamp);
 
-  if (!init_cb_.is_null() && !initialized_) {
+  if (init_cb_ && !initialized_) {
     std::vector<std::shared_ptr<StreamInfo>> streams;
     if (audio_stream_info_)
       streams.push_back(audio_stream_info_);
@@ -470,11 +470,11 @@ bool WebMClusterParser::OnBlock(bool is_simple_block,
         }
 
         streams.push_back(video_stream_info_);
-        init_cb_.Run(streams);
+        init_cb_(streams);
         initialized_ = true;
       }
     } else {
-      init_cb_.Run(streams);
+      init_cb_(streams);
       initialized_ = true;
     }
   }
@@ -553,7 +553,7 @@ bool WebMClusterParser::Track::ApplyDurationEstimateIfNeeded() {
 
   // Don't use the applied duration as a future estimation (don't use
   // EmitBufferHelp() here.)
-  if (!new_sample_cb_.Run(track_num_, last_added_buffer_missing_duration_))
+  if (!new_sample_cb_(track_num_, last_added_buffer_missing_duration_))
     return false;
   last_added_buffer_missing_duration_ = NULL;
   return true;
@@ -594,7 +594,7 @@ bool WebMClusterParser::Track::EmitBufferHelp(
     }
   }
 
-  return new_sample_cb_.Run(track_num_, buffer);
+  return new_sample_cb_(track_num_, buffer);
 }
 
 int64_t WebMClusterParser::Track::GetDurationEstimate() {
diff --git a/packager/media/formats/webm/webm_cluster_parser.h b/packager/media/formats/webm/webm_cluster_parser.h
index 5f6f431632..2fe962f6e6 100644
--- a/packager/media/formats/webm/webm_cluster_parser.h
+++ b/packager/media/formats/webm/webm_cluster_parser.h
@@ -11,7 +11,6 @@
 #include <set>
 #include <string>
 
-#include "packager/base/compiler_specific.h"
 #include "packager/media/base/decryptor_source.h"
 #include "packager/media/base/media_parser.h"
 #include "packager/media/base/media_sample.h"
@@ -140,7 +139,7 @@ class WebMClusterParser : public WebMParserClient {
   /// Flush data currently in the parser and reset the parser so it can accept a
   /// new cluster.
   /// @return true on success, false otherwise.
-  bool Flush() WARN_UNUSED_RESULT;
+  [[nodiscard]] bool Flush();
 
   /// Parses a WebM cluster element in |buf|.
   /// @return -1 if the parse fails.
diff --git a/packager/media/formats/webm/webm_cluster_parser_unittest.cc b/packager/media/formats/webm/webm_cluster_parser_unittest.cc
index 6a45010f7a..fbe647700a 100644
--- a/packager/media/formats/webm/webm_cluster_parser_unittest.cc
+++ b/packager/media/formats/webm/webm_cluster_parser_unittest.cc
@@ -9,25 +9,26 @@
 
 #include <algorithm>
 #include <cstdlib>
+#include <functional>
 #include <string>
 #include <vector>
 
-#include "packager/base/bind.h"
-#include "packager/base/logging.h"
-#include "packager/base/strings/string_number_conversions.h"
+#include "absl/strings/str_format.h"
+#include "glog/logging.h"
 #include "packager/media/base/decrypt_config.h"
 #include "packager/media/base/raw_key_source.h"
 #include "packager/media/base/timestamp.h"
 #include "packager/media/formats/webm/cluster_builder.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
+using ::testing::_;
+using ::testing::DoAll;
 using ::testing::HasSubstr;
 using ::testing::InSequence;
+using ::testing::Mock;
 using ::testing::Return;
 using ::testing::SetArgPointee;
 using ::testing::StrictMock;
-using ::testing::Mock;
-using ::testing::_;
 
 namespace shaka {
 namespace media {
@@ -39,13 +40,13 @@ typedef std::map<uint32_t, BufferQueue> TextBufferQueueMap;
 MATCHER_P(OpusPacketDurationTooHigh, actual_duration_ms, "") {
   return CONTAINS_STRING(
       arg, "Warning, demuxed Opus packet with encoded duration: " +
-               base::IntToString(actual_duration_ms) +
+               absl::StrFormat("%d", actual_duration_ms) +
                "ms. Should be no greater than 120ms.");
 }
 
 MATCHER_P(WebMSimpleBlockDurationEstimated, estimated_duration_ms, "") {
   return CONTAINS_STRING(arg, "Estimating WebM block duration to be " +
-                                  base::IntToString(estimated_duration_ms) +
+                                  absl::StrFormat("%d", estimated_duration_ms) +
                                   "ms for the last (Simple)Block in the "
                                   "Cluster for this Track. Use BlockGroups "
                                   "with BlockDurations at the end of each "
@@ -57,9 +58,9 @@ MATCHER_P2(WebMBlockDurationMismatchesOpusDuration,
            opus_duration_ms,
            "") {
   return CONTAINS_STRING(
-      arg, "BlockDuration (" + base::IntToString(block_duration_ms) +
+      arg, "BlockDuration (" + absl::StrFormat("%d", block_duration_ms) +
                "ms) differs significantly from encoded duration (" +
-               base::IntToString(opus_duration_ms) + "ms).");
+               absl::StrFormat("%d", opus_duration_ms) + "ms).");
 }
 
 namespace {
@@ -184,7 +185,7 @@ class MockKeySource : public RawKeySource {
                Status(const std::vector<uint8_t>& key_id, EncryptionKey* key));
 };
 
-std::unique_ptr<Cluster> CreateCluster(int timecode,
+std::unique_ptr<Cluster> CreateCluster(int /*timecode*/,
                                        const BlockInfo* block_info,
                                        int block_count) {
   ClusterBuilder cb;
@@ -201,7 +202,7 @@ std::unique_ptr<Cluster> CreateCluster(int timecode,
       data_length = block_info[i].data_length;
     } else {
       data = kDefaultBlockData;
-      data_length = arraysize(kDefaultBlockData);
+      data_length = std::size(kDefaultBlockData);
     }
 
     if (block_info[i].use_simple_block) {
@@ -404,6 +405,7 @@ class WebMClusterParserTest : public testing::Test {
       const std::string& audio_encryption_key_id,
       const std::string& video_encryption_key_id, const Codec audio_codec,
       const Codec video_codec, const MediaParser::InitCB& init_cb) {
+    using namespace std::placeholders;
     audio_stream_info_->set_codec(audio_codec);
     video_stream_info_->set_codec(video_codec);
     return new WebMClusterParser(
@@ -411,8 +413,7 @@ class WebMClusterParserTest : public testing::Test {
         VPCodecConfigurationRecord(), audio_default_duration,
         video_default_duration, text_tracks, ignored_tracks,
         audio_encryption_key_id, video_encryption_key_id,
-        base::Bind(&WebMClusterParserTest::NewSampleEvent,
-                   base::Unretained(this)),
+        std::bind(&WebMClusterParserTest::NewSampleEvent, this, _1, _2),
         init_cb, &mock_key_source_);
   }
 
@@ -456,10 +457,11 @@ class WebMClusterParserTest : public testing::Test {
   // Create a parser for test with custom video codec, also check for init
   // events.
   WebMClusterParser* CreateParserWithCodec(const Codec video_codec) {
+    using namespace std::placeholders;
     return CreateParserHelper(
         kNoTimestamp, kNoTimestamp, TextTracks(), std::set<int64_t>(),
         std::string(), std::string(), kUnknownCodec, video_codec,
-        base::Bind(&WebMClusterParserTest::InitEvent, base::Unretained(this)));
+        std::bind(&WebMClusterParserTest::InitEvent, this, _1));
   }
 
   bool VerifyBuffers(const BlockInfo* block_info, int block_count) {
@@ -542,8 +544,8 @@ TEST_F(WebMClusterParserTest, TracksWithSampleMissingDuration) {
     7,  // 4th audio ready, 5th audio held back with no duration
   };
 
-  ASSERT_EQ(arraysize(kBlockInfo), arraysize(kExpectedBuffersOnPartialCluster));
-  int block_count = arraysize(kBlockInfo);
+  ASSERT_EQ(std::size(kBlockInfo), std::size(kExpectedBuffersOnPartialCluster));
+  int block_count = std::size(kBlockInfo);
 
   // Iteratively create a cluster containing the first N+1 blocks and parse the
   // cluster. Verify that the corresponding entry in
@@ -572,7 +574,7 @@ TEST_F(WebMClusterParserTest, TracksWithSampleMissingDuration) {
 TEST_F(WebMClusterParserTest, Reset) {
   InSequence s;
 
-  int block_count = arraysize(kDefaultBlockInfo);
+  int block_count = std::size(kDefaultBlockInfo);
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kDefaultBlockInfo, block_count));
 
@@ -592,7 +594,7 @@ TEST_F(WebMClusterParserTest, Reset) {
 }
 
 TEST_F(WebMClusterParserTest, ParseClusterWithSingleCall) {
-  int block_count = arraysize(kDefaultBlockInfo);
+  int block_count = std::size(kDefaultBlockInfo);
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kDefaultBlockInfo, block_count));
 
@@ -602,7 +604,7 @@ TEST_F(WebMClusterParserTest, ParseClusterWithSingleCall) {
 }
 
 TEST_F(WebMClusterParserTest, ParseClusterWithMultipleCalls) {
-  int block_count = arraysize(kDefaultBlockInfo);
+  int block_count = std::size(kDefaultBlockInfo);
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kDefaultBlockInfo, block_count));
 
@@ -645,7 +647,7 @@ TEST_F(WebMClusterParserTest, ParseBlockGroup) {
       {kAudioTrackNum, 0, 23, false, NULL, 0, true},
       {kVideoTrackNum, 33, 34, false, NULL, 0, true},
   };
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
 
   const uint8_t kClusterData[] = {
     0x1F, 0x43, 0xB6, 0x75, 0x9B,  // Cluster(size=27)
@@ -659,7 +661,7 @@ TEST_F(WebMClusterParserTest, ParseBlockGroup) {
     0xA1, 0x85, 0x82, 0x00, 0x21, 0x00, 0x55,  // Block(size=5, track=2, ts=33)
     0x9B, 0x81, 0x22,  // BlockDuration(size=1, value=34)
   };
-  const int kClusterSize = arraysize(kClusterData);
+  const int kClusterSize = std::size(kClusterData);
 
   int result = parser_->Parse(kClusterData, kClusterSize);
   EXPECT_EQ(kClusterSize, result);
@@ -674,7 +676,7 @@ TEST_F(WebMClusterParserTest, ParseSimpleBlockAndBlockGroupMixture) {
       {kAudioTrackNum, 46, 23, false, NULL, 0, false},
       {kVideoTrackNum, 67, 33, false, NULL, 0, false},
   };
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
   std::unique_ptr<Cluster> cluster(CreateCluster(0, kBlockInfo, block_count));
 
   int result = parser_->Parse(cluster->data(), cluster->size());
@@ -696,7 +698,7 @@ TEST_F(WebMClusterParserTest, IgnoredTracks) {
       {kAudioTrackNum, 46, 23, true, NULL, 0, false},
       {kVideoTrackNum, 67, 34, true, NULL, 0, false},
   };
-  int input_block_count = arraysize(kInputBlockInfo);
+  int input_block_count = std::size(kInputBlockInfo);
 
   const BlockInfo kOutputBlockInfo[] = {
       {kAudioTrackNum, 0, 23, true, NULL, 0, false},
@@ -705,7 +707,7 @@ TEST_F(WebMClusterParserTest, IgnoredTracks) {
       {kAudioTrackNum, 46, 23, true, NULL, 0, false},
       {kVideoTrackNum, 67, 34, true, NULL, 0, false},
   };
-  int output_block_count = arraysize(kOutputBlockInfo);
+  int output_block_count = std::size(kOutputBlockInfo);
 
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kInputBlockInfo, input_block_count));
@@ -735,7 +737,7 @@ TEST_F(WebMClusterParserTest, ParseTextTracks) {
       {kTextTrackNum, 55, 44, false, NULL, 0, true},
       {kVideoTrackNum, 67, 34, true, NULL, 0, false},
   };
-  int input_block_count = arraysize(kInputBlockInfo);
+  int input_block_count = std::size(kInputBlockInfo);
 
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kInputBlockInfo, input_block_count));
@@ -759,7 +761,7 @@ TEST_F(WebMClusterParserTest, TextTracksSimpleBlock) {
   const BlockInfo kInputBlockInfo[] = {
       {kTextTrackNum, 33, 42, true, NULL, 0, false},
   };
-  int input_block_count = arraysize(kInputBlockInfo);
+  int input_block_count = std::size(kInputBlockInfo);
 
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kInputBlockInfo, input_block_count));
@@ -795,7 +797,7 @@ TEST_F(WebMClusterParserTest, ParseMultipleTextTracks) {
       {kVideoTrackNum, 67, 34, true, NULL, 0, false},
       {kSubtitleTextTrackNum, 67, 33, false, NULL, 0, false},
   };
-  int input_block_count = arraysize(kInputBlockInfo);
+  int input_block_count = std::size(kInputBlockInfo);
 
   std::unique_ptr<Cluster> cluster(
       CreateCluster(0, kInputBlockInfo, input_block_count));
@@ -815,7 +817,7 @@ TEST_F(WebMClusterParserTest, ParseMultipleTextTracks) {
 
 TEST_F(WebMClusterParserTest, ParseVP8) {
   std::unique_ptr<Cluster> cluster(
-      CreateCluster(kVP8Frame, arraysize(kVP8Frame)));
+      CreateCluster(kVP8Frame, std::size(kVP8Frame)));
   parser_.reset(CreateParserWithCodec(kCodecVP8));
 
   EXPECT_EQ(cluster->size(), parser_->Parse(cluster->data(), cluster->size()));
@@ -829,7 +831,7 @@ TEST_F(WebMClusterParserTest, ParseVP8) {
 
 TEST_F(WebMClusterParserTest, ParseVP9) {
   std::unique_ptr<Cluster> cluster(
-      CreateCluster(kVP9Frame, arraysize(kVP9Frame)));
+      CreateCluster(kVP9Frame, std::size(kVP9Frame)));
   parser_.reset(CreateParserWithCodec(kCodecVP9));
 
   EXPECT_EQ(cluster->size(), parser_->Parse(cluster->data(), cluster->size()));
@@ -845,14 +847,14 @@ TEST_F(WebMClusterParserTest, ParseEncryptedBlock) {
   const std::string video_key_id("video_key_id");
 
   EncryptionKey encryption_key;
-  encryption_key.key.assign(kMockKey, kMockKey + arraysize(kMockKey));
+  encryption_key.key.assign(kMockKey, kMockKey + std::size(kMockKey));
   EXPECT_CALL(
       mock_key_source_,
       GetKey(std::vector<uint8_t>(video_key_id.begin(), video_key_id.end()), _))
       .WillOnce(DoAll(SetArgPointee<1>(encryption_key), Return(Status::OK)));
 
   std::unique_ptr<Cluster> cluster(
-      CreateCluster(kEncryptedFrame, arraysize(kEncryptedFrame)));
+      CreateCluster(kEncryptedFrame, std::size(kEncryptedFrame)));
 
   parser_.reset(CreateParserWithKeyIdsAndCodec(std::string(), video_key_id,
                                                kUnknownCodec));
@@ -864,7 +866,7 @@ TEST_F(WebMClusterParserTest, ParseEncryptedBlock) {
   std::shared_ptr<MediaSample> buffer = video_buffers_[0];
   EXPECT_EQ(std::vector<uint8_t>(
                 kExpectedDecryptedFrame,
-                kExpectedDecryptedFrame + arraysize(kExpectedDecryptedFrame)),
+                kExpectedDecryptedFrame + std::size(kExpectedDecryptedFrame)),
             std::vector<uint8_t>(buffer->data(),
                                  buffer->data() + buffer->data_size()));
 }
@@ -873,7 +875,7 @@ TEST_F(WebMClusterParserTest, ParseEncryptedBlockGetKeyFailed) {
   EXPECT_CALL(mock_key_source_, GetKey(_, _)).WillOnce(Return(Status::UNKNOWN));
 
   std::unique_ptr<Cluster> cluster(
-      CreateCluster(kEncryptedFrame, arraysize(kEncryptedFrame)));
+      CreateCluster(kEncryptedFrame, std::size(kEncryptedFrame)));
 
   parser_.reset(CreateParserWithKeyIdsAndCodec(std::string(), "video_key_id",
                                                kUnknownCodec));
@@ -884,7 +886,7 @@ TEST_F(WebMClusterParserTest, ParseEncryptedBlockGetKeyFailed) {
 
 TEST_F(WebMClusterParserTest, ParseBadEncryptedBlock) {
   std::unique_ptr<Cluster> cluster(
-      CreateCluster(kEncryptedFrame, arraysize(kEncryptedFrame) - 2));
+      CreateCluster(kEncryptedFrame, std::size(kEncryptedFrame) - 2));
 
   parser_.reset(CreateParserWithKeyIdsAndCodec(std::string(), "video_key_id",
                                                kUnknownCodec));
@@ -894,7 +896,7 @@ TEST_F(WebMClusterParserTest, ParseBadEncryptedBlock) {
 
 TEST_F(WebMClusterParserTest, ParseClearFrameInEncryptedTrack) {
   std::unique_ptr<Cluster> cluster(CreateCluster(
-      kClearFrameInEncryptedTrack, arraysize(kClearFrameInEncryptedTrack)));
+      kClearFrameInEncryptedTrack, std::size(kClearFrameInEncryptedTrack)));
 
   parser_.reset(CreateParserWithKeyIdsAndCodec(std::string(), "video_key_id",
                                                kUnknownCodec));
@@ -906,7 +908,7 @@ TEST_F(WebMClusterParserTest, ParseClearFrameInEncryptedTrack) {
   std::shared_ptr<MediaSample> buffer = video_buffers_[0];
   EXPECT_EQ(std::vector<uint8_t>(
                 kExpectedClearFrame,
-                kExpectedClearFrame + arraysize(kExpectedClearFrame)),
+                kExpectedClearFrame + std::size(kExpectedClearFrame)),
             std::vector<uint8_t>(buffer->data(),
                                  buffer->data() + buffer->data_size()));
 }
@@ -916,7 +918,7 @@ TEST_F(WebMClusterParserTest, ParseInvalidZeroSizedCluster) {
     0x1F, 0x43, 0xB6, 0x75, 0x80,  // CLUSTER (size = 0)
   };
 
-  EXPECT_EQ(-1, parser_->Parse(kBuffer, arraysize(kBuffer)));
+  EXPECT_EQ(-1, parser_->Parse(kBuffer, std::size(kBuffer)));
   // Verify init event not called.
   ASSERT_EQ(0u, streams_from_init_event_.size());
 }
@@ -927,7 +929,7 @@ TEST_F(WebMClusterParserTest, ParseInvalidUnknownButActuallyZeroSizedCluster) {
     0x1F, 0x43, 0xB6, 0x75, 0x85,  // CLUSTER (size = 5)
   };
 
-  EXPECT_EQ(-1, parser_->Parse(kBuffer, arraysize(kBuffer)));
+  EXPECT_EQ(-1, parser_->Parse(kBuffer, std::size(kBuffer)));
 }
 
 TEST_F(WebMClusterParserTest, ParseInvalidTextBlockGroupWithoutDuration) {
@@ -944,7 +946,7 @@ TEST_F(WebMClusterParserTest, ParseInvalidTextBlockGroupWithoutDuration) {
   const BlockInfo kBlockInfo[] = {
       {kTextTrackNum, 33, -42, false, NULL, 0, false},
   };
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
   std::unique_ptr<Cluster> cluster(CreateCluster(0, kBlockInfo, block_count));
   int result = parser_->Parse(cluster->data(), cluster->size());
   EXPECT_LT(result, 0);
@@ -970,7 +972,7 @@ TEST_F(WebMClusterParserTest, ParseWithDefaultDurationsSimpleBlocks) {
        false},
   };
 
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
   std::unique_ptr<Cluster> cluster(CreateCluster(0, kBlockInfo, block_count));
 
   // Now parse a whole cluster to verify that all the blocks will get parsed
@@ -1004,7 +1006,7 @@ TEST_F(WebMClusterParserTest, ParseWithoutAnyDurationsSimpleBlocks) {
       {kVideoTrackNum, 100, 35, true, NULL, 0, false},
   };
 
-  int block_count1 = arraysize(kBlockInfo1);
+  int block_count1 = std::size(kBlockInfo1);
   std::unique_ptr<Cluster> cluster1(
       CreateCluster(0, kBlockInfo1, block_count1));
 
@@ -1026,7 +1028,7 @@ TEST_F(WebMClusterParserTest, ParseWithoutAnyDurationsSimpleBlocks) {
       {kVideoTrackNum, 135, kExpectedVideoEstimationInMs, true, NULL, 0, false},
   };
 
-  int block_count2 = arraysize(kBlockInfo2);
+  int block_count2 = std::size(kBlockInfo2);
   std::unique_ptr<Cluster> cluster2(
       CreateCluster(0, kBlockInfo2, block_count2));
   EXPECT_EQ(cluster2->size(),
@@ -1058,7 +1060,7 @@ TEST_F(WebMClusterParserTest, ParseWithoutAnyDurationsBlockGroups) {
       {kVideoTrackNum, 100, -35, false, NULL, 0, false},
   };
 
-  int block_count1 = arraysize(kBlockInfo1);
+  int block_count1 = std::size(kBlockInfo1);
   std::unique_ptr<Cluster> cluster1(
       CreateCluster(0, kBlockInfo1, block_count1));
 
@@ -1082,7 +1084,7 @@ TEST_F(WebMClusterParserTest, ParseWithoutAnyDurationsBlockGroups) {
        false},
   };
 
-  int block_count2 = arraysize(kBlockInfo2);
+  int block_count2 = std::size(kBlockInfo2);
   std::unique_ptr<Cluster> cluster2(
       CreateCluster(0, kBlockInfo2, block_count2));
   EXPECT_EQ(cluster2->size(),
@@ -1105,7 +1107,7 @@ TEST_F(WebMClusterParserTest,
        true, NULL, 0, false},
   };
 
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
   std::unique_ptr<Cluster> cluster(CreateCluster(0, kBlockInfo, block_count));
   int result = parser_->Parse(cluster->data(), cluster->size());
   EXPECT_EQ(cluster->size(), result);
@@ -1124,7 +1126,7 @@ TEST_F(WebMClusterParserTest,
        false},
   };
 
-  int block_count = arraysize(kBlockInfo);
+  int block_count = std::size(kBlockInfo);
   std::unique_ptr<Cluster> cluster(CreateCluster(0, kBlockInfo, block_count));
   int result = parser_->Parse(cluster->data(), cluster->size());
   EXPECT_EQ(cluster->size(), result);
diff --git a/packager/media/formats/webm/webm_content_encodings.cc b/packager/media/formats/webm/webm_content_encodings.cc
index e66912a0df..4b6f6248ec 100644
--- a/packager/media/formats/webm/webm_content_encodings.cc
+++ b/packager/media/formats/webm/webm_content_encodings.cc
@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "packager/base/logging.h"
 #include "packager/media/formats/webm/webm_content_encodings.h"
 
+#include "glog/logging.h"
+
 namespace shaka {
 namespace media {
 
diff --git a/packager/media/formats/webm/webm_content_encodings_client.cc b/packager/media/formats/webm/webm_content_encodings_client.cc
index 2dbb386cfd..edc209ce8b 100644
--- a/packager/media/formats/webm/webm_content_encodings_client.cc
+++ b/packager/media/formats/webm/webm_content_encodings_client.cc
@@ -4,7 +4,7 @@
 
 #include "packager/media/formats/webm/webm_content_encodings_client.h"
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace shaka {
diff --git a/packager/media/formats/webm/webm_content_encodings_client.h b/packager/media/formats/webm/webm_content_encodings_client.h
index e73058c976..9b2407ed49 100644
--- a/packager/media/formats/webm/webm_content_encodings_client.h
+++ b/packager/media/formats/webm/webm_content_encodings_client.h
@@ -8,7 +8,6 @@
 #include <memory>
 #include <vector>
 
-#include "packager/base/callback.h"
 #include "packager/media/formats/webm/webm_content_encodings.h"
 #include "packager/media/formats/webm/webm_parser.h"
 
diff --git a/packager/media/formats/webm/webm_content_encodings_client_unittest.cc b/packager/media/formats/webm/webm_content_encodings_client_unittest.cc
index cd34ddd1b1..09e714c587 100644
--- a/packager/media/formats/webm/webm_content_encodings_client_unittest.cc
+++ b/packager/media/formats/webm/webm_content_encodings_client_unittest.cc
@@ -8,7 +8,7 @@
 
 #include <string>
 
-#include "packager/base/strings/string_number_conversions.h"
+#include "absl/strings/numbers.h"
 #include "packager/media/formats/webm/webm_constants.h"
 #include "packager/media/formats/webm/webm_parser.h"
 
diff --git a/packager/media/formats/webm/webm_crypto_helpers.cc b/packager/media/formats/webm/webm_crypto_helpers.cc
index 14efd5f1f1..9a39e8f23d 100644
--- a/packager/media/formats/webm/webm_crypto_helpers.cc
+++ b/packager/media/formats/webm/webm_crypto_helpers.cc
@@ -4,8 +4,8 @@
 
 #include "packager/media/formats/webm/webm_crypto_helpers.h"
 
-#include "packager/base/logging.h"
-#include "packager/base/sys_byteorder.h"
+#include "absl/base/internal/endian.h"
+#include "glog/logging.h"
 #include "packager/media/base/buffer_reader.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
diff --git a/packager/media/formats/webm/webm_info_parser.cc b/packager/media/formats/webm/webm_info_parser.cc
index a55d0f453e..baca66f37e 100644
--- a/packager/media/formats/webm/webm_info_parser.cc
+++ b/packager/media/formats/webm/webm_info_parser.cc
@@ -4,7 +4,9 @@
 
 #include "packager/media/formats/webm/webm_info_parser.h"
 
-#include "packager/base/logging.h"
+#include <ctime>
+
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace shaka {
@@ -35,7 +37,9 @@ int WebMInfoParser::Parse(const uint8_t* buf, int size) {
   return parser.IsParsingComplete() ? result : 0;
 }
 
-WebMParserClient* WebMInfoParser::OnListStart(int id) { return this; }
+WebMParserClient* WebMInfoParser::OnListStart(int /*id*/) {
+  return this;
+}
 
 bool WebMInfoParser::OnListEnd(int id) {
   if (id == kWebMIdInfo && timecode_scale_ == -1) {
@@ -83,21 +87,22 @@ bool WebMInfoParser::OnBinary(int id, const uint8_t* data, int size) {
     for (int i = 0; i < size; ++i)
       date_in_nanoseconds = (date_in_nanoseconds << 8) | data[i];
 
-    base::Time::Exploded exploded_epoch;
-    exploded_epoch.year = 2001;
-    exploded_epoch.month = 1;
-    exploded_epoch.day_of_month = 1;
-    exploded_epoch.hour = 0;
-    exploded_epoch.minute = 0;
-    exploded_epoch.second = 0;
-    exploded_epoch.millisecond = 0;
-    date_utc_ = base::Time::FromUTCExploded(exploded_epoch) +
-        base::TimeDelta::FromMicroseconds(date_in_nanoseconds / 1000);
+    std::tm exploded_epoch;
+    exploded_epoch.tm_year = 2001;
+    exploded_epoch.tm_mon = 1;
+    exploded_epoch.tm_mday = 1;
+    exploded_epoch.tm_hour = 0;
+    exploded_epoch.tm_min = 0;
+    exploded_epoch.tm_sec = 0;
+
+    date_utc_ =
+        std::chrono::system_clock::from_time_t(std::mktime(&exploded_epoch)) +
+        std::chrono::microseconds(date_in_nanoseconds / 1000);
   }
   return true;
 }
 
-bool WebMInfoParser::OnString(int id, const std::string& str) {
+bool WebMInfoParser::OnString(int /*id*/, const std::string& /*str*/) {
   return true;
 }
 
diff --git a/packager/media/formats/webm/webm_info_parser.h b/packager/media/formats/webm/webm_info_parser.h
index e547754c48..9c96949b6a 100644
--- a/packager/media/formats/webm/webm_info_parser.h
+++ b/packager/media/formats/webm/webm_info_parser.h
@@ -5,8 +5,8 @@
 #ifndef PACKAGER_MEDIA_FORMATS_WEBM_WEBM_INFO_PARSER_H_
 #define PACKAGER_MEDIA_FORMATS_WEBM_WEBM_INFO_PARSER_H_
 
-#include "packager/base/compiler_specific.h"
-#include "packager/base/time/time.h"
+#include <chrono>
+
 #include "packager/media/formats/webm/webm_parser.h"
 
 namespace shaka {
@@ -26,7 +26,7 @@ class WebMInfoParser : public WebMParserClient {
 
   int64_t timecode_scale() const { return timecode_scale_; }
   double duration() const { return duration_; }
-  base::Time date_utc() const { return date_utc_; }
+  std::chrono::system_clock::time_point date_utc() const { return date_utc_; }
 
  private:
   // WebMParserClient methods
@@ -39,7 +39,7 @@ class WebMInfoParser : public WebMParserClient {
 
   int64_t timecode_scale_;
   double duration_;
-  base::Time date_utc_;
+  std::chrono::system_clock::time_point date_utc_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMInfoParser);
 };
diff --git a/packager/media/formats/webm/webm_media_parser.cc b/packager/media/formats/webm/webm_media_parser.cc
index fa43542563..8ca1df28d2 100644
--- a/packager/media/formats/webm/webm_media_parser.cc
+++ b/packager/media/formats/webm/webm_media_parser.cc
@@ -6,9 +6,7 @@
 
 #include <string>
 
-#include "packager/base/callback.h"
-#include "packager/base/callback_helpers.h"
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/base/buffer_writer.h"
 #include "packager/media/base/timestamp.h"
 #include "packager/media/formats/webm/webm_cluster_parser.h"
@@ -27,12 +25,12 @@ WebMMediaParser::~WebMMediaParser() {}
 
 void WebMMediaParser::Init(const InitCB& init_cb,
                            const NewMediaSampleCB& new_media_sample_cb,
-                           const NewTextSampleCB& new_text_sample_cb,
+                           const NewTextSampleCB&,
                            KeySource* decryption_key_source) {
   DCHECK_EQ(state_, kWaitingForInit);
-  DCHECK(init_cb_.is_null());
-  DCHECK(!init_cb.is_null());
-  DCHECK(!new_media_sample_cb.is_null());
+  DCHECK(!init_cb_);
+  DCHECK(init_cb);
+  DCHECK(new_media_sample_cb);
 
   ChangeState(kParsingHeaders);
   init_cb_ = init_cb;
diff --git a/packager/media/formats/webm/webm_media_parser.h b/packager/media/formats/webm/webm_media_parser.h
index aeca4f3258..994098d38a 100644
--- a/packager/media/formats/webm/webm_media_parser.h
+++ b/packager/media/formats/webm/webm_media_parser.h
@@ -5,8 +5,6 @@
 #ifndef PACKAGER_MEDIA_FORMATS_WEBM_WEBM_MEDIA_PARSER_H_
 #define PACKAGER_MEDIA_FORMATS_WEBM_WEBM_MEDIA_PARSER_H_
 
-#include "packager/base/callback_forward.h"
-#include "packager/base/compiler_specific.h"
 #include "packager/media/base/byte_queue.h"
 #include "packager/media/base/media_parser.h"
 
@@ -26,8 +24,8 @@ class WebMMediaParser : public MediaParser {
             const NewMediaSampleCB& new_media_sample_cb,
             const NewTextSampleCB& new_text_sample_cb,
             KeySource* decryption_key_source) override;
-  bool Flush() override WARN_UNUSED_RESULT;
-  bool Parse(const uint8_t* buf, int size) override WARN_UNUSED_RESULT;
+  [[nodiscard]] bool Flush() override;
+  [[nodiscard]] bool Parse(const uint8_t* buf, int size) override;
   /// @}
 
  private:
diff --git a/packager/media/formats/webm/webm_parser.cc b/packager/media/formats/webm/webm_parser.cc
index ffebf9f8e1..4c0c26d6b9 100644
--- a/packager/media/formats/webm/webm_parser.cc
+++ b/packager/media/formats/webm/webm_parser.cc
@@ -13,8 +13,7 @@
 
 #include <limits>
 
-#include "packager/base/logging.h"
-#include "packager/base/numerics/safe_conversions.h"
+#include "glog/logging.h"
 #include "packager/media/formats/webm/webm_constants.h"
 
 namespace shaka {
@@ -385,7 +384,7 @@ static const ElementIdInfo kSimpleTagIds[] = {
 };
 
 #define LIST_ELEMENT_INFO(id, level, id_info) \
-    { (id), (level), (id_info), arraysize(id_info) }
+  { (id), (level), (id_info), std::size(id_info) }
 
 static const ListElementInfo kListElementInfo[] = {
   LIST_ELEMENT_INFO(kWebMIdCluster, 1, kClusterIds),
@@ -557,7 +556,7 @@ static ElementType FindIdType(int id,
 
 // Finds ListElementInfo for a specific ID.
 static const ListElementInfo* FindListInfo(int id) {
-  for (size_t i = 0; i < arraysize(kListElementInfo); ++i) {
+  for (size_t i = 0; i < std::size(kListElementInfo); ++i) {
     if (id == kListElementInfo[i].id_)
       return &kListElementInfo[i];
   }
@@ -588,7 +587,7 @@ static int ParseUInt(const uint8_t* buf,
   // We use int64_t in place of uint64_t everywhere for convenience.  See this
   // bug
   // for more details: http://crbug.com/366750#c3
-  if (!base::IsValueInRangeForNumericType<int64_t>(value))
+  if (value > static_cast<uint64_t>(std::numeric_limits<int64_t>::max()))
     return -1;
 
   if (!client->OnUInt(id, value))
@@ -705,22 +704,22 @@ bool WebMParserClient::OnListEnd(int id) {
   return false;
 }
 
-bool WebMParserClient::OnUInt(int id, int64_t val) {
+bool WebMParserClient::OnUInt(int id, int64_t /*val*/) {
   DVLOG(1) << "Unexpected unsigned integer element with ID " << std::hex << id;
   return false;
 }
 
-bool WebMParserClient::OnFloat(int id, double val) {
+bool WebMParserClient::OnFloat(int id, double /*val*/) {
   DVLOG(1) << "Unexpected float element with ID " << std::hex << id;
   return false;
 }
 
-bool WebMParserClient::OnBinary(int id, const uint8_t* data, int size) {
+bool WebMParserClient::OnBinary(int id, const uint8_t* /*data*/, int /*size*/) {
   DVLOG(1) << "Unexpected binary element with ID " << std::hex << id;
   return false;
 }
 
-bool WebMParserClient::OnString(int id, const std::string& str) {
+bool WebMParserClient::OnString(int id, const std::string& /*str*/) {
   DVLOG(1) << "Unexpected string element with ID " << std::hex << id;
   return false;
 }
@@ -985,7 +984,7 @@ bool WebMListParser::IsSiblingOrAncestor(int id_a, int id_b) const {
 
   if (id_a == kWebMIdCluster) {
     // kWebMIdCluster siblings.
-    for (size_t i = 0; i < arraysize(kSegmentIds); i++) {
+    for (size_t i = 0; i < std::size(kSegmentIds); i++) {
       if (kSegmentIds[i].id_ == id_b)
         return true;
     }
diff --git a/packager/media/formats/webm/webm_parser.h b/packager/media/formats/webm/webm_parser.h
index b62ff86b66..2ec5c02974 100644
--- a/packager/media/formats/webm/webm_parser.h
+++ b/packager/media/formats/webm/webm_parser.h
@@ -10,7 +10,7 @@
 #include <string>
 #include <vector>
 
-#include "packager/base/macros.h"
+#include "packager/macros.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/media/formats/webm/webm_parser_unittest.cc b/packager/media/formats/webm/webm_parser_unittest.cc
index cd88392f91..4c9b9a5b37 100644
--- a/packager/media/formats/webm/webm_parser_unittest.cc
+++ b/packager/media/formats/webm/webm_parser_unittest.cc
@@ -342,7 +342,7 @@ TEST_F(WebMParserTest, ReservedIds) {
   const uint8_t* kBuffers[] = {k1ByteReservedId, k2ByteReservedId,
                                k3ByteReservedId, k4ByteReservedId};
 
-  for (size_t i = 0; i < arraysize(kBuffers); i++) {
+  for (size_t i = 0; i < std::size(kBuffers); i++) {
     int id;
     int64_t element_size;
     int buffer_size = 2 + static_cast<int>(i);
@@ -370,7 +370,7 @@ TEST_F(WebMParserTest, ReservedSizes) {
                                k5ByteReservedSize, k6ByteReservedSize,
                                k7ByteReservedSize, k8ByteReservedSize};
 
-  for (size_t i = 0; i < arraysize(kBuffers); i++) {
+  for (size_t i = 0; i < std::size(kBuffers); i++) {
     int id;
     int64_t element_size;
     int buffer_size = 2 + static_cast<int>(i);
diff --git a/packager/media/formats/webm/webm_tracks_parser.cc b/packager/media/formats/webm/webm_tracks_parser.cc
index f9073d8d6f..b95fec0a3b 100644
--- a/packager/media/formats/webm/webm_tracks_parser.cc
+++ b/packager/media/formats/webm/webm_tracks_parser.cc
@@ -4,9 +4,8 @@
 
 #include "packager/media/formats/webm/webm_tracks_parser.h"
 
-#include "packager/base/logging.h"
-#include "packager/base/strings/string_number_conversions.h"
-#include "packager/base/strings/string_util.h"
+#include "absl/strings/str_format.h"
+#include "glog/logging.h"
 #include "packager/media/base/timestamp.h"
 #include "packager/media/formats/webm/webm_constants.h"
 #include "packager/media/formats/webm/webm_content_encodings.h"
@@ -251,7 +250,7 @@ bool WebMTracksParser::OnListEnd(int id) {
         DLOG(INFO) << "Ignoring text track " << track_num_;
         ignored_tracks_.insert(track_num_);
       } else {
-        std::string track_num = base::Int64ToString(track_num_);
+        std::string track_num = absl::StrFormat("%d", track_num_);
         text_tracks_[track_num_] = TextTrackConfig(
             text_track_kind, track_name_, track_language_, track_num);
       }
@@ -309,7 +308,7 @@ bool WebMTracksParser::OnUInt(int id, int64_t val) {
   return true;
 }
 
-bool WebMTracksParser::OnFloat(int id, double val) {
+bool WebMTracksParser::OnFloat(int /*id*/, double /*val*/) {
   return true;
 }
 
diff --git a/packager/media/formats/webm/webm_tracks_parser.h b/packager/media/formats/webm/webm_tracks_parser.h
index 7e33a6f708..0bb3379886 100644
--- a/packager/media/formats/webm/webm_tracks_parser.h
+++ b/packager/media/formats/webm/webm_tracks_parser.h
@@ -11,7 +11,6 @@
 #include <string>
 #include <vector>
 
-#include "packager/base/time/time.h"
 #include "packager/media/base/audio_stream_info.h"
 #include "packager/media/base/text_track_config.h"
 #include "packager/media/base/video_stream_info.h"
diff --git a/packager/media/formats/webm/webm_tracks_parser_unittest.cc b/packager/media/formats/webm/webm_tracks_parser_unittest.cc
index 36dd2db57e..ec50a663bb 100644
--- a/packager/media/formats/webm/webm_tracks_parser_unittest.cc
+++ b/packager/media/formats/webm/webm_tracks_parser_unittest.cc
@@ -7,7 +7,7 @@
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/base/timestamp.h"
 #include "packager/media/formats/webm/tracks_builder.h"
 #include "packager/media/formats/webm/webm_constants.h"
diff --git a/packager/media/formats/webm/webm_video_client.cc b/packager/media/formats/webm/webm_video_client.cc
index f0fdcd1d25..0f53035786 100644
--- a/packager/media/formats/webm/webm_video_client.cc
+++ b/packager/media/formats/webm/webm_video_client.cc
@@ -4,7 +4,7 @@
 
 #include "packager/media/formats/webm/webm_video_client.h"
 
-#include "packager/base/logging.h"
+#include "glog/logging.h"
 #include "packager/media/base/video_util.h"
 #include "packager/media/codecs/av1_codec_configuration_record.h"
 #include "packager/media/codecs/vp_codec_configuration_record.h"
@@ -254,12 +254,14 @@ bool WebMVideoClient::OnUInt(int id, int64_t val) {
   return true;
 }
 
-bool WebMVideoClient::OnBinary(int id, const uint8_t* data, int size) {
+bool WebMVideoClient::OnBinary(int /*id*/,
+                               const uint8_t* /*data*/,
+                               int /*size*/) {
   // Accept binary fields we don't care about for now.
   return true;
 }
 
-bool WebMVideoClient::OnFloat(int id, double val) {
+bool WebMVideoClient::OnFloat(int /*id*/, double /*val*/) {
   // Accept float fields we don't care about for now.
   return true;
 }
diff --git a/packager/media/formats/webm/webm_webvtt_parser.h b/packager/media/formats/webm/webm_webvtt_parser.h
index 8fbd150380..67989fb652 100644
--- a/packager/media/formats/webm/webm_webvtt_parser.h
+++ b/packager/media/formats/webm/webm_webvtt_parser.h
@@ -9,7 +9,7 @@
 
 #include <string>
 
-#include "packager/base/macros.h"
+#include "packager/macros.h"
 
 namespace shaka {
 namespace media {
diff --git a/packager/third_party/libwebm/CMakeLists.txt b/packager/third_party/libwebm/CMakeLists.txt
index c988ab0280..1c295eefe1 100644
--- a/packager/third_party/libwebm/CMakeLists.txt
+++ b/packager/third_party/libwebm/CMakeLists.txt
@@ -15,6 +15,10 @@ set(ENABLE_WEBMINFO OFF)
 set(ENABLE_TESTS OFF)
 set(ENABLE_IWYU OFF)
 set(ENABLE_WEBM_PARSER OFF)
+set(MSVC_RUNTIME "dll")
 
 # With these set in scope of this folder, load the library's own CMakeLists.txt.
 add_subdirectory(source)
+
+# libwebm headers have relative include paths that only get resolved with this.
+target_include_directories(webm PUBLIC source)