It is fail to request pad in rtpbin

[Zheng, Shude]

It is working to use command line, gst-launch, for rtp server and client. I want to convert the command line to application. I must get the send_rtp_sink_%d pad of rtpbin for linking to rtppcmapay. I use

Newpad = gst_element_get_request_pad(rtpbin, “send_rtp_sink_%d”).

It returns null. If I change the pad name to send_rtp_sink_0. It will give an error “comparing send_rtp_sink_0 to src%d.

Any help will be greatly appreciated.

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[Eric Eric]

Hi, Zheng Shude:

send_rtp_sink_%d -- %d should be replaced with your RTSP session id. :)

Eric Zhang

Zheng, Shude wrote:

>
> It is working to use command line, gst-launch, for rtp server and
> client. I want to convert the command line to application. I must get
> the send_rtp_sink_%d pad of rtpbin for linking to rtppcmapay. I use
>
> Newpad = gst_element_get_request_pad(rtpbin, “send_rtp_sink_%d”).
>
> It returns null. If I change the pad name to send_rtp_sink_0. It will
> give an error “comparing send_rtp_sink_0 to src%d.
>
> Any help will be greatly appreciated.
>
> ------------------------------------------------------------------------
>
> -------------------------------------------------------------------------
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[Zheng, Shude]

Hi, Eric,

Can you give me more detail how to get session id and replace it. I
directly replaced it with 0(send_rtp_sink_0) as the command line did,
but it gives the error. Need I set session first or call some function
to get the session ID?

Thanks,

Shude

-----Original Message-----
From: Eric Zhang [mailto:[hidden email]]
Sent: Thursday, July 24, 2008 5:38 PM
To: Discussion of the development of GStreamer
Cc: Zheng, Shude
Subject: Re: [gst-devel] It is fail to request pad in rtpbin

Hi, Zheng Shude:

send_rtp_sink_%d -- %d should be replaced with your RTSP session id. :)

Eric Zhang

Zheng, Shude wrote:

>
> It is working to use command line, gst-launch, for rtp server and
> client. I want to convert the command line to application. I must get
> the send_rtp_sink_%d pad of rtpbin for linking to rtppcmapay. I use
>
> Newpad = gst_element_get_request_pad(rtpbin, "send_rtp_sink_%d").
>
> It returns null. If I change the pad name to send_rtp_sink_0. It will
> give an error "comparing send_rtp_sink_0 to src%d.
>
> Any help will be greatly appreciated.
>
>

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[Zoltan Seress]

Hi

This has to work. You said you had a proper command line. Start it with this modification:
GST_DEBUG_DUMP_DOT_DIR=$PWD gst-launch + "rest of the pipeline"

The you will have some *.dot files in your current working directory.
Then use this command in the shell: dot -Tpng xxx.dot -opipeline.png
This will create a pipeline.png image, which reveals the connection between the elements and other details, for example session ID-s.

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