Muxer SAP can't use unicast address when same_port=1

[nunojpg]

Muxer SAP when used with:
-two streams (video and audio)
-same_port=1
-unicast address

Produces a SAP announcement that is not recognized by ffplay or VLC.

With a multicast address it works fine!

nuno@ground3:~$ ffmpeg -f v4l2 -i /dev/video0 -f alsa -i hw:1 -f sap sap://127.0.0.1?same_port=1
ffmpeg version N-62130-g8348bd1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr  4 2014 17:04:57 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --enable-libx264 --enable-gpl --enable-libfaac --enable-nonfree
  libavutil      52. 73.100 / 52. 73.100
  libavcodec     55. 56.108 / 55. 56.108
  libavformat    55. 36.101 / 55. 36.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  3.100 /  4.  3.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 7716.272909, bitrate: 165888 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:1':
  Duration: N/A, start: 1396632350.346565, bitrate: 1024 kb/s
    Stream #1:0: Audio: pcm_s16le, 32000 Hz, stereo, s16, 1024 kb/s
Output #0, sap, to 'sap://127.0.0.1?same_port=1':
  Metadata:
    encoder         : Lavf55.36.101
    Stream #0:0: Video: mpeg4, yuv420p, 1920x1080, q=2-31, 200 kb/s, 90k tbn, 5 tbc
    Stream #0:1: Audio: aac (libfaac), 32000 Hz, stereo, s16, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  Stream #1:0 -> #0:1 (pcm_s16le -> libfaac)
Press [q] to stop, [?] for help
frame=   37 fps=5.2 q=7.4 Lsize=N/A time=00:00:07.40 bitrate=N/A dup=2 drop=0    
video:504kB audio:96kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3005486311931904.000000%
Received signal 2: terminating.

nuno@ground3:~$ ffprobe sap://
ffprobe version N-62130-g8348bd1 Copyright (c) 2007-2014 the FFmpeg developers
  built on Apr  4 2014 17:04:57 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --enable-libx264 --enable-gpl --enable-libfaac --enable-nonfree
  libavutil      52. 73.100 / 52. 73.100
  libavcodec     55. 56.108 / 55. 56.108
  libavformat    55. 36.101 / 55. 36.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  3.100 /  4.  3.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
[udp @ 0x37d15c0] bind failed: Address already in use
sap://: Invalid data found when processing input

The SAP announcement being made:

sdp://v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
t=0 0
a=tool:libavformat 55.36.101
m=video 5004 RTP/AVP 96
c=IN IP4 127.0.0.1
b=AS:200
a=rtpmap:96 MP4V-ES/90000
a=fmtp:96 profile-level-id=1; config=000001B001000001B58913000001000000012000C48D88002D3C04871443000001B24C61766335352E35362E313038
m=audio 5004 RTP/AVP 97
c=IN IP4 127.0.0.1
b=AS:128
a=rtpmap:97 MPEG4-GENERIC/32000/2
a=fmtp:97 profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3; config=1290