diff --git a/common/libwebm_util.cc b/common/libwebm_util.cc
index 82b1934..7520bb7 100644
--- a/common/libwebm_util.cc
+++ b/common/libwebm_util.cc
@@ -83,4 +83,10 @@ bool WriteUint8(std::uint8_t val, std::FILE* fileptr) {
   return (std::fputc(val, fileptr) == val);
 }
 
+std::uint16_t ReadUint16(const std::uint8_t* buf) {
+  if (buf == nullptr)
+    return 0;
+  return ((buf[0] << 8) | buf[1]);
+}
+
 }  // namespace libwebm
diff --git a/common/libwebm_util.h b/common/libwebm_util.h
index 14df585..233c482 100644
--- a/common/libwebm_util.h
+++ b/common/libwebm_util.h
@@ -54,6 +54,10 @@ bool ParseVP9SuperFrameIndex(const std::uint8_t* frame,
 // Writes |val| to |fileptr| and returns true upon success.
 bool WriteUint8(std::uint8_t val, std::FILE* fileptr);
 
+// Reads 2 bytes from |buf| and returns them as a uint16_t. Returns 0 when |buf|
+// is a nullptr.
+std::uint16_t ReadUint16(const std::uint8_t* buf);
+
 }  // namespace libwebm
 
 #endif  // LIBWEBM_COMMON_LIBWEBM_UTIL_H_
diff --git a/m2ts/vpxpes_parser.cc b/m2ts/vpxpes_parser.cc
index cbc0ee7..d4d2fbd 100644
--- a/m2ts/vpxpes_parser.cc
+++ b/m2ts/vpxpes_parser.cc
@@ -189,6 +189,9 @@ bool VpxPesParser::ParsePesOptionalHeader(PesOptionalHeader* header) {
       return false;
     }
 
+    header->pts = (pes_file_data_[offset] & 0xe) << 29 |
+                  ((ReadUint16(&pes_file_data_[offset + 1]) & ~1) << 14) |
+                  (ReadUint16(&pes_file_data_[offset + 3]) >> 1);
     offset += 5;
     bytes_left -= 5;
   }