diff -up chromium-62.0.3192.0/media/base/audio_codecs.cc.extra-media chromium-62.0.3192.0/media/base/audio_codecs.cc
--- chromium-62.0.3192.0/media/base/audio_codecs.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/base/audio_codecs.cc	2017-08-30 15:39:09.735186077 +0200
@@ -44,6 +44,8 @@ std::string GetCodecName(AudioCodec code
       return "alac";
     case kCodecAC3:
       return "ac3";
+    case kCodecDTS:
+      return "dts";
   }
   NOTREACHED();
   return "";
@@ -68,6 +70,8 @@ AudioCodec StringToAudioCodec(const std:
     return kCodecVorbis;
   if (base::StartsWith(codec_id, "mp4a.40.", base::CompareCase::SENSITIVE))
     return kCodecAAC;
+  if (codec_id == "dts")
+    return kCodecDTS;
   return kUnknownAudioCodec;
 }
 
diff -up chromium-62.0.3192.0/media/base/audio_codecs.h.extra-media chromium-62.0.3192.0/media/base/audio_codecs.h
--- chromium-62.0.3192.0/media/base/audio_codecs.h.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/base/audio_codecs.h	2017-08-30 15:39:09.735186077 +0200
@@ -32,13 +32,14 @@ enum AudioCodec {
   kCodecPCM_ALAW = 14,
   kCodecALAC = 15,
   kCodecAC3 = 16,
+  kCodecDTS = 17,
   // DO NOT ADD RANDOM AUDIO CODECS!
   //
   // The only acceptable time to add a new codec is if there is production code
   // that uses said codec in the same CL.
 
   // Must always be equal to the largest entry ever logged.
-  kAudioCodecMax = kCodecAC3,
+  kAudioCodecMax = kCodecDTS,
 };
 
 std::string MEDIA_EXPORT GetCodecName(AudioCodec codec);
diff -up chromium-62.0.3192.0/media/base/decode_capabilities.cc.extra-media chromium-62.0.3192.0/media/base/decode_capabilities.cc
--- chromium-62.0.3192.0/media/base/decode_capabilities.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/base/decode_capabilities.cc	2017-08-30 15:39:09.737186041 +0200
@@ -146,6 +146,9 @@ bool IsSupportedAudioConfig(const AudioC
     case media::kCodecPCM_S24BE:
     case media::kCodecPCM_ALAW:
     case media::kCodecVorbis:
+    case media::kCodecEAC3:
+    case media::kCodecAC3:
+    case media::kCodecDTS:
       return true;
 
     case media::kCodecAMR_NB:
@@ -157,9 +160,7 @@ bool IsSupportedAudioConfig(const AudioC
       return false;
 #endif
 
-    case media::kCodecEAC3:
     case media::kCodecALAC:
-    case media::kCodecAC3:
     case media::kUnknownAudioCodec:
       return false;
   }
@@ -179,13 +180,13 @@ bool IsSupportedVideoConfig(const VideoC
     case media::kCodecH264:
     case media::kCodecVP8:
     case media::kCodecTheora:
+    case media::kCodecMPEG4:
+    case media::kCodecHEVC:
       return true;
 
     case media::kUnknownVideoCodec:
     case media::kCodecVC1:
     case media::kCodecMPEG2:
-    case media::kCodecMPEG4:
-    case media::kCodecHEVC:
     case media::kCodecDolbyVision:
       return false;
   }
diff -up chromium-62.0.3192.0/media/base/mime_util_internal.cc.extra-media chromium-62.0.3192.0/media/base/mime_util_internal.cc
--- chromium-62.0.3192.0/media/base/mime_util_internal.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/base/mime_util_internal.cc	2017-08-30 15:44:46.519076991 +0200
@@ -74,6 +74,10 @@
         {"vorbis", MimeUtil::VORBIS}, {"opus", MimeUtil::OPUS},
         {"flac", MimeUtil::FLAC}, {"vp8", MimeUtil::VP8},
         {"vp8.0", MimeUtil::VP8}, {"theora", MimeUtil::THEORA},
+        {"dts", MimeUtil::DTS},
+        {"mp2", MimeUtil::MP2},
+        {"mp4v.20.8", MimeUtil::MPEG4_SP},
+        {"mp4v.20.240", MimeUtil::MPEG4_ASP},
 // TODO(dalecurtis): This is not the correct final string. Fix before enabling
 // by default. http://crbug.com/784607
 #if BUILDFLAG(ENABLE_AV1_DECODER)
@@ -175,6 +179,9 @@
       return kCodecTheora;
     case MimeUtil::DOLBY_VISION:
       return kCodecDolbyVision;
+    case MimeUtil::MPEG4_SP:
+    case MimeUtil::MPEG4_ASP:
+      return kCodecMPEG4;
     default:
       break;
   }
@@ -269,6 +276,32 @@
   CodecSet ogg_codecs(ogg_audio_codecs);
   ogg_codecs.insert(ogg_video_codecs.begin(), ogg_video_codecs.end());
 
+  CodecSet matroska_audio_codecs;
+  matroska_audio_codecs.emplace(OPUS);
+  matroska_audio_codecs.emplace(VORBIS);
+  matroska_audio_codecs.emplace(AC3);
+  matroska_audio_codecs.emplace(EAC3);
+  matroska_audio_codecs.emplace(DTS);
+  matroska_audio_codecs.emplace(MP3);
+  matroska_audio_codecs.emplace(MP2);
+  matroska_audio_codecs.emplace(MPEG2_AAC);
+  matroska_audio_codecs.emplace(MPEG4_AAC);
+  matroska_audio_codecs.emplace(PCM);
+  matroska_audio_codecs.emplace(FLAC);
+
+  CodecSet matroska_video_codecs;
+  matroska_video_codecs.emplace(THEORA);
+  matroska_video_codecs.emplace(VP8);
+  matroska_video_codecs.emplace(VP9);
+  matroska_video_codecs.emplace(H264);
+  matroska_video_codecs.emplace(MPEG4_SP);
+  matroska_video_codecs.emplace(MPEG4_ASP);
+#if BUILDFLAG(ENABLE_HEVC_DEMUXING)
+  matroska_video_codecs.emplace(HEVC);
+#endif  // BUILDFLAG(ENABLE_HEVC_DEMUXING)
+  CodecSet matroska_codecs(matroska_audio_codecs);
+  matroska_codecs.insert(matroska_video_codecs.begin(), matroska_video_codecs.end());
+
   const CodecSet webm_audio_codecs{OPUS, VORBIS};
   CodecSet webm_video_codecs{VP8, VP9};
 #if BUILDFLAG(ENABLE_AV1_DECODER)
@@ -303,6 +336,8 @@
 #endif  // BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
 
   mp4_video_codecs.emplace(H264);
+  mp4_video_codecs.emplace(MPEG4_SP);
+  mp4_video_codecs.emplace(MPEG4_ASP);
 #if BUILDFLAG(ENABLE_HEVC_DEMUXING)
   mp4_video_codecs.emplace(HEVC);
 #endif  // BUILDFLAG(ENABLE_HEVC_DEMUXING)
@@ -340,12 +375,16 @@
   DCHECK(!mp4_video_codecs.empty());
   AddContainerWithCodecs("video/mp4", mp4_codecs, false);
 
+  AddContainerWithCodecs("audio/x-matroska", matroska_audio_codecs, false);
+  AddContainerWithCodecs("video/x-matroska", matroska_codecs, false);
+
 #if BUILDFLAG(USE_PROPRIETARY_CODECS)
   AddContainerWithCodecs("audio/aac", implicit_codec, true);  // AAC / ADTS.
   // These strings are supported for backwards compatibility only and thus only
   // support the codecs needed for compatibility.
   AddContainerWithCodecs("audio/x-m4a", aac, true);
   AddContainerWithCodecs("video/x-m4v", avc_and_aac, true);
+  AddContainerWithCodecs("video/x-msvideo", matroska_codecs, true);
 
 #if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
   // TODO(ddorwin): Exactly which codecs should be supported?
@@ -975,10 +1014,14 @@
     case H264:
     case HEVC:
     case DOLBY_VISION:
+    case DTS:
+    case MPEG4_SP:
+    case MPEG4_ASP:
       return true;
 
     case MP3:
     case PCM:
+    case MP2:
     case VORBIS:
     case OPUS:
     case FLAC:
diff -up chromium-62.0.3192.0/media/base/mime_util_internal.h.extra-media chromium-62.0.3192.0/media/base/mime_util_internal.h
--- chromium-62.0.3192.0/media/base/mime_util_internal.h.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/base/mime_util_internal.h	2017-08-30 15:39:09.734186095 +0200
@@ -45,7 +45,11 @@
     THEORA,
     DOLBY_VISION,
     AV1,
-    LAST_CODEC = AV1
+    DTS,
+    MP2,
+    MPEG4_SP,
+    MPEG4_ASP,
+    LAST_CODEC = MPEG4_ASP
   };
 
   // Platform configuration structure.  Controls which codecs are supported at
diff -up chromium-62.0.3192.0/media/ffmpeg/ffmpeg_common.cc.extra-media chromium-62.0.3192.0/media/ffmpeg/ffmpeg_common.cc
--- chromium-62.0.3192.0/media/ffmpeg/ffmpeg_common.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/ffmpeg/ffmpeg_common.cc	2017-08-30 15:39:09.735186077 +0200
@@ -115,6 +115,8 @@ AudioCodec CodecIDToAudioCodec(AVCodecID
       return kCodecOpus;
     case AV_CODEC_ID_ALAC:
       return kCodecALAC;
+    case AV_CODEC_ID_DTS:
+      return kCodecDTS;
     default:
       DVLOG(1) << "Unknown audio CodecID: " << codec_id;
   }
@@ -166,6 +168,10 @@ AVCodecID AudioCodecToCodecID(AudioCodec
       return AV_CODEC_ID_PCM_MULAW;
     case kCodecOpus:
       return AV_CODEC_ID_OPUS;
+    case kCodecAC3:
+      return AV_CODEC_ID_AC3;
+    case kCodecDTS:
+      return AV_CODEC_ID_DTS;
     default:
       DVLOG(1) << "Unknown AudioCodec: " << audio_codec;
   }
diff -up chromium-62.0.3192.0/media/filters/ffmpeg_video_decoder.cc.extra-media chromium-62.0.3192.0/media/filters/ffmpeg_video_decoder.cc
--- chromium-62.0.3192.0/media/filters/ffmpeg_video_decoder.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/filters/ffmpeg_video_decoder.cc	2017-08-30 15:39:09.736186059 +0200
@@ -59,7 +59,6 @@
       case kUnknownVideoCodec:
       case kCodecVC1:
       case kCodecMPEG2:
-      case kCodecHEVC:
       case kCodecVP9:
       case kCodecAV1:
       case kCodecDolbyVision:
@@ -73,6 +72,7 @@
       case kCodecH264:
       case kCodecMPEG4:
       case kCodecVP8:
+      case kCodecHEVC:
         // Normalize to three threads for 1080p content, then scale linearly
         // with number of pixels.
         // Examples:
diff -up chromium-62.0.3192.0/media/remoting/proto_enum_utils.cc.extra-media chromium-62.0.3192.0/media/remoting/proto_enum_utils.cc
--- chromium-62.0.3192.0/media/remoting/proto_enum_utils.cc.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/remoting/proto_enum_utils.cc	2017-08-30 15:39:09.736186059 +0200
@@ -57,6 +57,7 @@ base::Optional<AudioCodec> ToMediaAudioC
     CASE_RETURN_OTHER(kCodecPCM_ALAW);
     CASE_RETURN_OTHER(kCodecALAC);
     CASE_RETURN_OTHER(kCodecAC3);
+    CASE_RETURN_OTHER(kCodecDTS);
   }
   return base::nullopt;  // Not a 'default' to ensure compile-time checks.
 }
@@ -83,6 +84,7 @@ base::Optional<pb::AudioDecoderConfig::C
     CASE_RETURN_OTHER(kCodecPCM_ALAW);
     CASE_RETURN_OTHER(kCodecALAC);
     CASE_RETURN_OTHER(kCodecAC3);
+    CASE_RETURN_OTHER(kCodecDTS);
   }
   return base::nullopt;  // Not a 'default' to ensure compile-time checks.
 }
diff -up chromium-62.0.3192.0/media/remoting/rpc.proto.extra-media chromium-62.0.3192.0/media/remoting/rpc.proto
--- chromium-62.0.3192.0/media/remoting/rpc.proto.extra-media	2017-08-22 21:04:45.000000000 +0200
+++ chromium-62.0.3192.0/media/remoting/rpc.proto	2017-08-30 15:39:09.736186059 +0200
@@ -66,6 +66,7 @@ message AudioDecoderConfig {
     kCodecPCM_ALAW = 14;
     kCodecALAC = 15;
     kCodecAC3 = 16;
+    kCodecDTS = 17;
   }
 
   // Proto version of media::SampleFormat.
diff -up chromium-62.0.3192.0/net/base/mime_util.cc.extra-media chromium-62.0.3192.0/net/base/mime_util.cc
--- chromium-62.0.3192.0/net/base/mime_util.cc.extra-media	2017-08-22 21:04:46.000000000 +0200
+++ chromium-62.0.3192.0/net/base/mime_util.cc	2017-08-30 15:47:23.952221630 +0200
@@ -91,6 +91,9 @@ static const MimeInfo kPrimaryMappings[]
     {"image/jpeg", "jpeg,jpg"},
     {"image/png", "png"},
     {"image/webp", "webp"},
+    {"video/x-matroska", "mkv"},
+    {"audio/x-matroska", "mkv"},
+    {"video/x-msvideo", "avi"},
     {"multipart/related", "mht,mhtml"},
     {"text/css", "css"},
     {"text/html", "html,htm,shtml,shtm"},
@@ -492,6 +495,7 @@ static const char* const kStandardAudioT
   "audio/vorbis",
   "audio/wav",
   "audio/webm",
+  "audio/x-matroska",
   "audio/x-m4a",
   "audio/x-ms-wma",
   "audio/vnd.rn-realaudio",
@@ -509,8 +513,10 @@ static const char* const kStandardVideoT
   "video/webm",
   "video/x-dv",
   "video/x-m4v",
+  "video/x-matroska",
   "video/x-mpeg",
   "video/x-ms-asf",
+  "video/x-msvideo",
   "video/x-ms-wmv"
 };