[vlc-devel] [PATCH] live555: fix the subtitles issue

Rémi Denis-Courmont remi at remlab.net
Mon Dec 30 15:48:37 CET 2013

Le lundi 30 décembre 2013, 15:17:59 Gilles Chanteperdrix a écrit :
> > RTP is completely different.
> Well, if the client sends a packet on the server RTP port before the
> server starts sending packet from its RTP port to the firewall port
> where the original packet seemed to come from, the firewall will "see"
> the RTP stream as an answer to this original packet. So, it is the same
> thing. At least, for the first RTP packet.

As a matter of facts, no.

You will establish a NAT binding between a NAT port and the server RTP port of 
the server. The client does not know the NAT port, so it cannot put it into 
the SETUP request. In other words, this is nonsense.

Unless of course, *both* the server and the client are extended in proprietary 
manner such that the server parses the incoming RTP packets and communicates 
the NAT port back to the client. But that would not fly; the VideoLAN and 
live555 projects do not command a large enough market share of RTSP servers.

Rémi Denis-Courmont

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