diff --git a/packager/media/formats/mp2t/mp2t_media_parser.cc b/packager/media/formats/mp2t/mp2t_media_parser.cc
index 093bbd1489..4ecb9dd76a 100644
--- a/packager/media/formats/mp2t/mp2t_media_parser.cc
+++ b/packager/media/formats/mp2t/mp2t_media_parser.cc
@@ -306,10 +306,13 @@ void Mp2tMediaParser::RegisterPes(int pmt_pid,
           sbr_in_mimetype_));
       is_audio = true;
       break;
-    default:
-      VLOG(1) << "Ignore unsupported stream type 0x" << std::hex << stream_type
-              << std::dec;
+    default: {
+      LOG_IF(ERROR, !stream_type_logged_once_[stream_type])
+          << "Ignore unsupported MPEG2TS stream type 0x" << std::hex
+          << stream_type << std::dec;
+      stream_type_logged_once_[stream_type] = true;
       return;
+    }
   }
 
   // Create the PES state here.
diff --git a/packager/media/formats/mp2t/mp2t_media_parser.h b/packager/media/formats/mp2t/mp2t_media_parser.h
index ec9f9d286a..a74b20570c 100644
--- a/packager/media/formats/mp2t/mp2t_media_parser.h
+++ b/packager/media/formats/mp2t/mp2t_media_parser.h
@@ -87,6 +87,10 @@ class Mp2tMediaParser : public MediaParser {
   // Whether |init_cb_| has been invoked.
   bool is_initialized_;
 
+  // A map used to track unsupported stream types and make sure the error is
+  // only logged once.
+  std::map<uint8_t, bool> stream_type_logged_once_;
+
   DISALLOW_COPY_AND_ASSIGN(Mp2tMediaParser);
 };
 
diff --git a/packager/media/formats/mp2t/ts_stream_type.h b/packager/media/formats/mp2t/ts_stream_type.h
index 990b428ed4..9258706c0e 100644
--- a/packager/media/formats/mp2t/ts_stream_type.h
+++ b/packager/media/formats/mp2t/ts_stream_type.h
@@ -15,12 +15,26 @@ namespace mp2t {
 
 enum class TsStreamType {
   // ISO-13818.1 / ITU H.222 Table 2-34 "Stream type assignments"
+  kMpeg1Video = 0x01,  // ISO/IEC 11172-2 Video
+  kMpeg2Video = 0x02,  // ITU-T H.262 | ISO/IEC 13818-2 Video |
+                       // ISO/IEC 11172-2 constrained parameter video stream
+  kMpeg1Audio = 0x03,  // ISO/IEC 11172-3 Audio
+  kMpeg2Audio = 0x04,  // ISO/IEC 13818-3 Audio
+  kPesPrivateData =
+      0x06,  // ISO/IEC 13818-1 PES packets containing private data. It is also
+             // used by DVB (TS 101 154 DVB specification ...) to carry AC3 in
+             // TS (while ATSC uses 0x81 defined below).
   kAdtsAac = 0x0F,
   kAvc = 0x1B,
   kHevc = 0x24,
-  // ATSC Standard A/52.
+  // Below are extensions defined in other specifications.
+  // AC3 and E-AC3 are defined in ATSC Standard A/52.
+  // Cannot find specification for DTS-HD and DTS. They are extracted from
+  // https://sno.phy.queensu.ca/~phil/exiftool/TagNames/M2TS.html.
   kAc3 = 0x81,
+  kDtsHd = 0x86,
   kEac3 = 0x87,
+  kDts = 0x8A,
   // MPEG-2 Stream Encryption Format for HTTP Live Streaming:
   // https://goo.gl/N7Tvqi.
   kEncryptedAc3 = 0xC1,