[FFmpeg-devel] [PATCH] sdp: Emit only one c= line for multiple streams, if they have the same destination

Luca Abeni lucabe72
Wed Oct 6 09:18:37 CEST 2010

Hi Martin,

On 10/05/2010 03:52 PM, Martin Storsj? wrote:
> On Tue, 5 Oct 2010, Luca Abeni wrote:
>> I'll have a look at this patch later (or tomorrow). Can you provide an
>> ffmpeg command line generating an SDP that vlc cannot read?
>> (I never managed to produce such SDPs, and I use ffmpeg to stream
>> sessions with multiple streams almost dayly).
> Hmm, yes, when storing the SDP to a file and playing it from there, it
> seems to work ok.
> In my case, I'm sending the SDP over SAP (RFC 2974), and in that case, VLC
> refuses to play it unless there's only one c= line.

Uhmm... Is this a vlc (or live555) issue/bug? Last time I played with SAP,
I do not remember it adding any constraints to the SDP (so, every valid
SDP should be accepted...).

Anyway, even if this is a vlc bug I am ok with adding a workaround. So,
the patch is good in principle; the code also looks good. But I'd like
to have a better look at it first... Give me 1 day or 2 :)

> I'm building an integrated SAP muxer - this was one of the cleanup commits
> I had to do to prepare for it. Once I post that one, you should be able to
> test it out as a whole :-)

Nice! Having a SAP muxer would definitively be a good thing... Up to
now, I always used a hacky SAP announcer as an external program.


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