Ignore aud and sei NALus when parsing bitstream.

webrtc/common_video/h264/h264_bitstream_parser.cc

Index: webrtc/common_video/h264/h264_bitstream_parser.cc
diff --git a/webrtc/common_video/h264/h264_bitstream_parser.cc b/webrtc/common_video/h264/h264_bitstream_parser.cc
index 4ad0ed4b283dcbf22b29f359dfcdcd5b73732214..85caa8c5a5d66d47dfc4d14e8d43f4bfc54277d7 100644
--- a/webrtc/common_video/h264/h264_bitstream_parser.cc
+++ b/webrtc/common_video/h264/h264_bitstream_parser.cc
@@ -284,6 +284,9 @@ void H264BitstreamParser::ParseSlice(const uint8_t* slice, size_t length) {
         LOG(LS_WARNING) << "Unable to parse PPS from H264 bitstream.";
       break;
     }
+    case H264::NaluType::kAud:
+    case H264::NaluType::kSei:
+      break;  // Ignore these nalus, as we don't care about their contents.
     default:
       Result res = ParseNonParameterSetNalu(slice, length, nalu_type);
       if (res != kOk)