[gst-devel] Problem with adding cap to pipeline

[sudarshan bisht]

 Hi Zelalem

   Dont add that caps2 element in bin .

On Tue, Jun 16, 2009 at 3:13 PM, Zelalem Sintayehu <zelalems at hotmail.com>wrote:

> Hi Sudarshan, thank you for your prompt response. In fact, I used the
> gst_caps_new_simple to create the caps. I used the GstCaps to define them
> before creating them. So, it was a mistake when I express it. I now used
> three link statements (please look at below. I used two link statements to
> link the two ends (leaving the caps in the m,iddle) and then used link
> filter to link the two links):
> gst_element_link_many (udpsource, queue1, h263depay, NULL);  //to link
> elements before the caps
> gst_element_link_many (avimuxer, queue2, filedes, NULL);  ////to link
> elements after the caps
> //link two elements with a filter (i.e. h263depay and queue2 with caps2)
> gboolean link_ok = gst_element_link_filtered (h263depay, avimuxer, caps2);
> //to link the above two links
>
> Now the error related to the link is gone (I don't know whether I am still
> correct or not), but the "add element to bin" function still produced the
> same error. The following is the output when i run my code:
>
> Starting program: /home/zelalem/videorecorder
> [Thread debugging using libthread_db enabled]
> [New Thread 0xb7bb66b0 (LWP 28219)]
>
> (videorecorder:28219): GStreamer-CRITICAL **: gst_bin_add: assertion
> `GST_IS_ELEMENT (element)' failed
> [New Thread 0xb7936b90 (LWP 28223)]
> [New Thread 0xb7135b90 (LWP 28224)]
> [New Thread 0xb67ffb90 (LWP 28225)]
>
> Program exited normally.
>
>
> So, I asume the problem is with adding teh cap into the pipeline.
>
> Thank you.
>
> - Zelalem S.
>
> ------------------------------
> Date: Tue, 16 Jun 2009 14:15:08 +0530
> From: bisht.sudarshan at gmail.com
> To: gstreamer-devel at lists.sourceforge.net
> Subject: Re: [gst-devel] Problem with adding cap to pipeline
>
>
> HI ,
>
>            Use gst_element_link_filtered to link two elements using caps
>  and use gst_caps_new_simple  to create the caps.
>
> On Tue, Jun 16, 2009 at 1:55 PM, Zelalem Sintayehu <zelalems at hotmail.com>wrote:
>
> Hi all, I had a command line code to record video into file that I receive
> from the network. The following is the code:
>
> gst-launch udpsrc port=5000
> caps="application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H263-1998"
> num-buffers=5000 ! queue ! rtph263pdepay !
> 'video/x-h263,width=320,height=240,framerate=(fraction)25/1' ! queue !
> avimux ! queue ! filesink location=test1.avi
>
> As I was preparing this to include in an application, when I changed the
> above command into a C code, I got an error. I traced back the error and
> understand that the error relates to adding the cap (that is located between
> the h263depay and the second queue (before avimux), please look at it
> above). The following is what I did to add the elements into the pipeline:
>
>   gst_bin_add_many (GST_BIN (pipeline), udpsource, queue1, h263depay,
> caps2, avimuxer, queue2, filedes, NULL);
>
> I created caps2 using GstCaps. The others are created using GstElement. To
> link the elements, I used the following:
>
>   gst_element_link_many(udpsource, queue1, h263depay,caps2,avimuxer,
> queue2, filedes, NULL);
>
> So, the above two statments created the following errors.
> (videorecorder:19632): GStreamer-CRITICAL **: gst_bin_add: assertion
> `GST_IS_ELEMENT (element)' failed
> (videorecorder:19632): GStreamer-CRITICAL **:
> gst_element_link_pads_filtered: assertion `GST_IS_ELEMENT (dest)' failed
>
> So, I want you to help me on how to add caps into pipeline and also link it
> to other elements.
>
> I have attached the whole code herewith.
>
> Thank you.
>
> - Zelalem S.
>
>
>
>
>
>
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> --
> Regards,
>
> Sudarshan Bisht
>
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-- 
Regards,

Sudarshan Bisht
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