[pjsip] set flag on packet for retransmition

Bill Gardner billg at wavearts.com
Thu Apr 14 09:56:17 EDT 2016

There isn't a mechanism to do that via RTP that I'm aware of. If the 
receiver needs a key frame it requests one by sending a "picture fast 
update" message via SIP INFO. PJSIP implements this mechanism. - Bill

On 4/14/2016 8:34 AM, poste9 wrote:
> I have implemented the libx264 codec for video call using pjsip and Im 
> wondering if there is any way to make sure a specific packet has arrived.
> Im not talking about frames but I would like to send SEI/SPS/PPS only 
> one time and make sure they arrived on the other side.
> At this moment I managed to send the packets but in a real world 
> application I cant know if they will reach the other end.
> I could use something to make that signaling by myself but I would 
> lose conpatibility.
> My real question is if I can set some flag on the rtp packet or maybe 
> using pjmedia itself to mark the header packets and get a response 
> from the other end when its all good. And of course using something 
> RFC like.
> I hope I managed to explain myself and thank you all in advance.
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