Reverse Engineering A Mysterious UDP Stream in My Hotel

A curious hotel guest used Wireshark to investigate UDP traffic on an unknown port and found out that the packets were multicast and had the same length of 634 bytes. After using Python to save and analyze the data, the guest discovered that the packets contained MPEG compressed audio data, but it took some trial and error to figure out the correct offset to get to the audio. The guest ultimately found that the audio was just elevator music played in the hotel corridors around the elevators.