[gst-devel] Streaming of videotest element - (UDP) Destination Unreachable

[Marco Ballesio]

Hi,

On Tue, Feb 8, 2011 at 1:36 PM, marcel.tella <marceltella at gmail.com> wrote:
>
> Hi!!
>
> I think I finally succeeded in streaming the video test pattern, so I have
> the following problem:
>
> My gst-launch command is this one:
>
> gst-launch videotestsrc ! rtpvrawpay ! udpsink host=127.0.0.1 port=5000
> sync=false
>
> I think that it's ok.
>
> My next step is to look at the correct packages with wireshark, and the
> next, to capture the stream with the VLC player.
>
> Well, the problem is that when I go to Wireshark, there are a lot of
> packages as expected, (udp) but there are a lot of ICMP messages which say
> port unreachable.
> http://gstreamer-devel.966125.n4.nabble.com/file/n3275784/Pantallazo.png
>
>
> I've supposed that the port isn't correct, but I've tryed to change it, to
> delete the part of the port to atomatically select.. but nothing... the same
> happens..
>
> Any idea??
>
>
> Because, this is an important question for me, If I manage to send this
> stream, it's a UDP package which has been before rtp packed, isn't it? So,
> if I want to catch it with VLC media player, I ought to work.

ICMP messages of type 3 (Destination unreachable) are sent if, for any
reasons, it's not possible to route the UDP packet to its destination.
This is valid, for instance, when the port on the destination host is
closed (no applications listening for the packets). If you want the
ICMP messages not to appear anymore, just use something like:

gst-launch udpsrc port=5000 ! rtpvrawdepay ! xvimagesink

or the VLC client you're planning to use.

Reagards

>
> Am I right? Or there is something wrong!?
>
>
> Thank you, I really appreciate your help!!
>
>
> --
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>
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