[Live-devel] Need help relaying RTP packets

[Mark Woodard]

If anyone is interested, here is the resolution of this issue:

So I created a module based on the Live555 sample testRTSPClient. Once I
> was receiving data from server A, I replaced the "DummySink" that it used
> with the BasicUDPSink that the sample testRelay is using, and created its
> output socket on the destination URL that I got from server B. That did not
> seem to work, and I was told that if I wanted to relay RTP packets, I
> should use a sink derived from RTPSink. So I replaced the BasicUDPSink with
> H264VideoRTPSink. That did not seem to work either.


All it was missing was to add an H264VideoStreamDiscreteFramer in
setupNextSubsession before calling sendSetupCommand. Now it works like a
charm.

This note in the FAQ led me to the answer (tiny font faithfully
reproduced):
If, however, you are streaming H.264, H.265, or MPEG-4 (or MPEG-2 video
with "B" frames), then you should insert the appropriate "**Discrete*Framer"
filter between your source object and your "*RTPSink" object.

Mark Woodard

___________________________________________________
Mark Woodard

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On Thu, Nov 2, 2017 at 12:30 PM, Mark Woodard <mwoodard at mutualink.net>
wrote:

> I have posted on this issue before and received conflicting answers, due
> to my inaccurate descriptions. So I'm going to try to ask one final time,
> being as careful as possible.
>
> I am trying to relay the RTP packets received from an RTSP server (server
> A, running 3rd party software) to a remote URL hosted by server B (running
> our own software). I must get the SDP of the video stream from server A and
> use it to ask server B for the destination URL. Communication with Server B
> does not require any type of streaming control protocol (RTCP, RTSP), but
> it knows how to accept RTP packets on a socket. All video streams from
> server A are H264.
>
> So I created a module based on the Live555 sample testRTSPClient. Once I
> was receiving data from server A, I replaced the "DummySink" that it used
> with the BasicUDPSink that the sample testRelay is using, and created its
> output socket on the destination URL that I got from server B. That did not
> seem to work, and I was told that if I wanted to relay RTP packets, I
> should use a sink derived from RTPSink. So I replaced the BasicUDPSink with
> H264VideoRTPSink. That did not seem to work either.
>
> So I'm hoping that someone can tell me if I am on the right track, or if I
> should be using a different sink.
>
> And here is another thing I find odd: When I create the output socket for
> the sink (a Groupsock), I notice that its constructor takes an address and
> port, but no scheme. I want it to use UDP, and I have the #define
> REQUEST_STREAMING_OVER_TCP set to False. Will it, in fact, use UDP?
> ___________________________________________________
> Mark Woodard
>
> Mutualink, Inc.
> 313 S Jupiter
> Allen, TX 75002
>
> Toll Free: (866) 957-5465 Ext: 508
> Direct: (972) 200-5020
> E-Mail: mwoodard at mutualink.net <employeer at mutualink.net>
>
> Web: www.mutualink.net
>
> *Certified by the Department of Homeland Security SAFETY Act for
> Interoperable Communications*
>
> The information in this email, and subsequent attachments, may contain
> confidential information that is intended solely for the attention and
> use of the named addressee(s). This message or any part thereof must not
> be disclosed, copied, distributed or retained by any person without
> authorization from the addressee.
>
> Visit Mutualink at the following social media sites:
>
> <http://www.twitter.com/MutualinkInc>
> <http://www.facebook.com/Mutualink>
> <http://www.linkedin.com/company/mutualink>
> The information in this email, and subsequent attachments, may contain
> confidential information that is intended solely for the attention and
> use of the named addressee(s). This message or any part thereof must not
> be disclosed, copied, distributed or retained by any person without
> authorization from the addressee.
>
>
>
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