Don't warn when PCR pids are encountered

We don't need a PCR stream for a program to keep synchronized but it's not a problem if one is included. Parse out the PCR PID when it's specified and make sure the warning message isn't output when they are encountered.

@@ -437,6 +437,9 @@
           // rest of header + CRC = 9 + 4
           pmtSectionLength -= 13;
 
+          // capture the PID of PCR packets so we can ignore them if we see any
+          self.stream.programMapTable.pcrPid = (data[offset + 8] & 0x1f) << 8 | data[offset + 9];
+
           // align offset to the first entry in the PMT
           offset += 12 + pmtProgramDescriptorsLength;
 
@@ -479,6 +482,10 @@
         // Service Description Table
       } else if (0x1FFF === pid) {
         // NULL packet
+      } else if (self.stream.programMapTable.pcrPid) {
+        // program clock reference (PCR) PID for the primary program
+        // PTS values are sufficient to synchronize playback for us so
+        // we can safely ignore these
       } else {
         videojs.log("Unknown PID parsing TS packet: " + pid);
       }

@@ -64,13 +64,16 @@
   makePmt = function(options) {
     var
       result = [],
+      pcr = options.pcr || 0,
       entryCount = 0,
       k,
       sectionLength;
 
     for (k in options.pids) {
+      if (k !== 'pcr') {
         entryCount++;
       }
+    }
     // table_id
     result.push(0x02);
     // section_syntax_indicator '0' reserved section_length
@@ -88,8 +91,8 @@
     // last_section_number
     result.push(0x00);
     // reserved PCR_PID
-    result.push(0xe1);
-    result.push(0x00);
+    result.push(0xe0 | (pcr & (0x1f << 8)));
+    result.push(pcr & 0xff);
     // reserved program_info_length
     result.push(0xf0);
     result.push(0x11); // hard-coded 17 byte descriptor
@@ -229,6 +232,19 @@
     ok(true, 'did not throw when a NIT is encountered');
   });
 
+  test('ignores packets with PCR pids', function() {
+    parser.parseSegmentBinaryData(new Uint8Array(makePacket({
+      programs: {
+        0x01: [0x01]
+      }
+    }).concat(makePacket({
+      pid: 0x01,
+      pcr: 0x02
+    }))));
+
+    equal(parser.stream.programMapTable.pcrPid, 0x02, 'parsed the PCR pid');
+  });
+
   test('recognizes metadata streams', function() {
     parser.parseSegmentBinaryData(new Uint8Array(makePacket({
       programs: {