[Ffmpeg-devel] sdp bug?

[Zoltan NAGY]

Hello!

I have this inside an sdp:
v=0
o=- 1121692460724730 8 IN IP4 127.0.0.1
s=NONE
t=0 0
a=tool:vlc 0.8.2-svn
c=IN IP4 127.0.0.1/0
m=audio 1234 RTP/AVP 102
a=rtpmap:102 mpeg4-generic/48000
a=fmtp:102 streamtype=5; profile-level-id=15; mode=AAC-hbr; config=1190; 
SizeLength=13;IndexLength=3; IndexDeltaLength=3; Pro
file=1;
m=video 1236 RTP/AVP 103
a=rtpmap:103 MP4V-ES/90000
a=fmtp:103 profile-level-id=3; 
config=000001b0f3000001b50ee0c0c0cf000001000000012000845d4c307d314043c1443f;

it should be comlpetely playable, and it is standard compliant as far as 
I can see.
however, if I try to feed it to ffplay:
plazma3:~/TESZT/sdp_javitas/ffmpeg# ffplay -stats file.sdp
rtp: IP_ADD_MEMBERSHIP: Invalid argument
file.sdp: Error while parsing header

why does it do that?
if I remove the audio part from the file, then ffplay doesnt quit 
instead shows me a totally blank window.

I have several sdp files which cannot be played with ffmpeg when it 
contains audio, but if I remove the audio descriptor lines,
then it plays fine - just without an audio.

however, what is interesting, an sdp generator by darwin for one of it's 
sample mp4 files is correctly playable with ffmpeg.

where should I look at?

Thanks in advance,

Zoltan NAGY,
Software Engineer