You can try to map more than 20 bytes from the file in mmap call, say use 1024, unpack the whole thing according to the http://mumble.sourceforge.net/Link and then extract the name and camera position:
s = struct.unpack('IL3f3f3f512s3f')
name = s[11].decode('utf-16')
camera_pos_x,camera_pos_y,camera_pos_z = s[12:15]