RTSP SDP IP ADDRESS XYZW

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C#

video

stream

UDP

Greetings : I'm learning "how to" with RTSP streaming and have a problem understanding a different type of SDP report. (SDP : Session Description Protocol)

Normally I see the following body of a SDP message:
v=0
o=GoogleStreamer 1845654209 1772722960 IN IP4 74.125.214.212
s=Video
c=IN IP4 0.0.0.0
b=AS:80
t=0 0
a=control:*
a=range:npt=0-3013.250000
m=video 0 RTP/AVP 97
b=AS:56
a=rtpmap:97 MP4V-ES/90000
a=control:trackID=2
a=cliprect:0,0,144,176
a=framesize:97 176-144
a=fmtp:97 profile-level-id=8;config=000001b008000001b58913000001000000012000c48d8800650584121463000001b2476f6f676c65
m=audio 0 RTP/AVP 96
b=AS:24
a=rtpmap:96 MP4A-LATM/22050/1
a=control:trackID=3
a=fmtp:96 profile-level-id=40;cpresent=0;config=400027103fc0

Notice the IP Address IP4 74.125.214.212 and I understand this as the address
But now I see the following:

v=0
o=GoogleStreamer 1845654209 1772722960 IN IP4 x.y.z.w
s=Video
c=IN IP4 0.0.0.0
b=AS:80
t=0 0
a=control:*
a=range:npt=0-3013.250000
m=video 0 RTP/AVP 97
b=AS:56
a=rtpmap:97 MP4V-ES/90000
a=control:trackID=2
a=cliprect:0,0,144,176
a=framesize:97 176-144
a=fmtp:97 profile-level-id=8;config=000001b008000001b58913000001000000012000c48d8800650584121463000001b2476f6f676c65
m=audio 0 RTP/AVP 96
b=AS:24
a=rtpmap:96 MP4A-LATM/22050/1
a=control:trackID=3
a=fmtp:96 profile-level-id=40;cpresent=0;config=400027103fc0

In the o=GoogleStreamer 1845654209 1772722960 IN IP4 x.y.z.w

What does the x.y.z.w mean and why is it in place of the IP Address ?