code: public static PcapRecordHeader createDefaultHeader(final long timestamp) {
          final byte[] body = new byte[SIZE];
  
          // time stamp seconds
          // body[0] = (byte) 0x00;
          // body[1] = (byte) 0x00;
          // body[2] = (byte) 0x00;
          // body[3] = (byte) 0x00;
  
          // Time stamp microseconds
          // body[4] = (byte) 0x00;
          // body[5] = (byte) 0x00;
          // body[6] = (byte) 0x00;
          // body[7] = (byte) 0x00;
  
          // The total length of the data
          // body[8] = (byte) 0x00;
          // body[9] = (byte) 0x00;
          // body[10] = (byte) 0x00;
          // body[11] = (byte) 0x00;
  
          // The length of the data captures within this frame
          // body[12] = (byte) 0x00;
          // body[13] = (byte) 0x00;
          // body[14] = (byte) 0x00;
          // body[15] = (byte) 0x00;
  
          final Buffer buffer = Buffers.wrap(body);
          buffer.setUnsignedInt(0, timestamp / 1000L);
  
          buffer.setUnsignedInt(4, timestamp % 1000L * 1000L);
          return new PcapRecordHeader(ByteOrder.LITTLE_ENDIAN, buffer);
      }
docs: Create a default record header, which you must alter later on to match
  whatever it is you are writing into the pcap stream.
  
  @param timestamp
  the timestamp in milliseconds since epoch. This is the
  timestamp of when the packet "arrived"
  
  @return