Re: [Linphone-developers] oRTP - only one of two sessions receiving data...

[John Pallister]

No, no firewall. Otherwise presumably none of the streams would've
ever got through.

I have tried randomising the SSRCs of the two stream copies to further
differentiate them, but to no avail.

It seems that if I destroy my two "receiver" objects (that contain the
oRTP sessions) in the client process and re-create them (which is how
I do the user actions of stopping & starting them), then they both
receive their stream copies successfully. But it's the same code that
creates them either at start-up or later, so I don't know why one is
more reliable than the other.

Very odd...

Cheers,

John :^P

On Mon, Apr 18, 2011 at 2:19 PM, t <address@hidden> wrote:
> firewall?
>
> On Mon, Apr 18, 2011 at 8:30 AM, John Pallister <address@hidden>
> wrote:
>>
>> Hi, thanks for your reply.
>>
>> Since I specifically said "[t]he RTP stream copies have different
>> source and destination ports" in my post, I have in fact considered
>> this (and verified it using Wireshark). The source ports are
>> randomised by default anyway.
>>
>> The weird thing is that it works sometimes (i.e. both stream copies
>> are detected) but not others.
>>
>> I'm going to try mangling the SSRCs and maybe the timestamps of the
>> stream copies to see if that makes a difference.
>>
>> Cheers,
>>
>> John :^P
>>
>> On Mon, Apr 18, 2011 at 12:20 PM, t <address@hidden> wrote:
>> > Ya hi,
>> >
>> > Clearly the rtp must use different source ports and the client must
>> > recognize the source ports as different streams...
>> >
>> > Since you don't mention udp ports, it's a fair assumption that you did
>> > not
>> > consider this.
>> >
>> > Cheers.
>> >
>> > On Sun, Apr 17, 2011 at 8:04 PM, John Pallister <address@hidden>
>> > wrote:
>> >>
>> >> Hello list,
>> >>
>> >> I'm really hoping someone can suggest something helpful for me here...
>> >>
>> >> My application runs on Windows XP SP3 over an intranet. No DNS, no
>> >> DHCP, no routing, very simple. It uses oRTP for simple point-to-point
>> >> routing of G.729-encoded audio; no RTCP, SIP etc. It is compiled with
>> >> Visual C++ 2008.
>> >>
>> >> The scenario: a "router" process sends two simultaneous copies of an
>> >> RTP stream (received from another process elsewhere on the network) to
>> >> two separate oRTP sessions in two threads of a client process, to be
>> >> played out of two different audio devices. The RTP stream copies have
>> >> different source and destination ports (but are otherwise identical);
>> >> the destination ports correspond to those of the oRTP sessions.
>> >>
>> >> The problem: I expect to receive both stream copies, however either
>> >> zero, one or two will be received by my application code from oRTP. I
>> >> can determine no pattern to how many copies will "work". Multiple
>> >> single streams (i.e. not duplicate streams sent simultaneously) are
>> >> received correctly and reliably.
>> >>
>> >> Does anyone have any experience with this sort of situation (or
>> >> anything vaguely similar), on Windows or otherwise? Am I being naïve
>> >> in expecting this to work? Does my router need to do something to the
>> >> stream copies to enable them to be reliably differentiated and
>> >> received correctly?
>> >>
>> >> Thanks very much,
>> >>
>> >> John :^P
>> >> --
>> >> John Pallister
>> >> address@hidden
>> >> address@hidden
>> >>
>> >> _______________________________________________
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>> >> http://lists.nongnu.org/mailman/listinfo/linphone-developers
>> >
>> >
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