Still can't get videomixer to do live video at full frame rate

Stefan Kost ensonic at
Fri Aug 19 09:20:44 PDT 2011

On 08/19/11 18:12, wally_bkg wrote:
> Stefan Kost wrote:
>> On 08/17/11 18:37, wally_bkg wrote:
>>> wally_bkg wrote:
>>>         // shift a camera to bottom half of container frame
>>> 	mixsink1=gst_element_get_pad(mixer,"sink_1");
>> gst_element_get_static_pad
>> Stefan
>>> 	if(mixsink1){
>>> 		g_object_set (G_OBJECT (mixsink1), "ypos", 480, NULL);	 
>>> 	}else
>>> 		g_print("Can't get mixer sink_1 pad!");
> Thanks, but this is a bit confusing.  Are you saying I should just use
> gst_element_get_static_pad() with the same arguments I used with
> gst_element_get_pad()?  
> I though the mixer pads were "request".  The documentation says the problem
> with gst_element_get_pad() was after getting the pad reference it wasn't
> clear which kind of pad it was.  

Sorry indeed those are request pads, so please use the other function.

> I'm not really clear why I need to care at this "top level" of my program as 
> these pad links are permanent for the duration of my program and I only
> needed the reference to set the ypos property on it before running the
> pipeline.  I don't see the need to free it here, what bad might happen if I
> don't free it before the program terminates?
We can't change this in 0.10.

> As a library design issue, why can't the pad_free function use object
> properties to free the proper pad type when called and free the user from
> knowing these internal details?
> My main complaint with gstreamer is there always seems to be multiple ways
> to do something and little or  no guidance as to in what situation one way
> would be better than the other.
> I tend to want to use an Occam's razor in that the approach that uses fewer
> lines of code is certainly better in terms of the next person to inherit my
> code when I retire.
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