[Ffmpeg-devel] sdp bug?

Luca Abeni lucabe72
Mon Jul 18 16:06:16 CEST 2005


On Mon, 2005-07-18 at 15:17 +0200, Zoltan NAGY wrote:
> Hello!
> I have this inside an sdp:
> v=0
> o=- 1121692460724730 8 IN IP4
> s=NONE
> t=0 0
> a=tool:vlc 0.8.2-svn
> c=IN IP4
I think ffmpeg expects this line to contain a multicast address... I did
not check the RFC, but I do not know if something like
<non-multicast-ip-address>/<ttl> is allowed. Also, a ttl equal to 0
looks strange...

> 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
I think libavformat is trying to join the " multicast group",
hence the error :)

> 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.
I am not sure if ffmpeg can correctly cope with AAC audio streams... I
suspect it will have problems synchronizing audio and video.


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