Writable parameter of an element is considered as not writable in GstControlBinding object

[vk_gst]

Hello,

I am trying to set certain properties for an element, more of trying to
control the element properties at runtime. Here is the source code, as
described int he previous  post
<http://gstreamer-devel.966125.n4.nabble.com/GStreamer-CRITICAL-gst-object-add-control-binding-assertion-binding-gt-pspec-failed-td4688007.html>  
. 

Here are the additional debug messages that I came across : 
0:00:00.174410648 [336m 8309[00m       0xd1b750 [37mTRACE  [00m
[00;01;31;44m     GST_REFCOUNTING
gstobject.c:207:gst_object_init:<GstObject at 0x10b0020>[00m 0x10b0020 new
0:00:00.174697421 [336m 8309[00m       0xd1b750 [37mTRACE  [00m
[00;01;31;44m     GST_REFCOUNTING
gstobject.c:207:gst_object_init:<GstObject at 0x10b20f0>[00m 0x10b20f0 new
0:00:00.174716708 [336m 8309[00m       0xd1b750 [36mINFO   [00m [00m  
gstcontrolbinding
gstcontrolbinding.c:144:gst_control_binding_constructor:<gltrnsfrm>[00m
trying to put property 'rotation-x' under control
0:00:00.174723927 [336m 8309[00m       0xd1b750 [37mDEBUG  [00m [00m  
gstcontrolbinding
gstcontrolbinding.c:150:gst_control_binding_constructor:<gltrnsfrm>[00m  
psec->flags : 0x000000e3
0:00:00.174729088 [336m 8309[00m       0xd1b750 [33;01mWARN   [00m [00m  
gstcontrolbinding
gstcontrolbinding.c:161:gst_control_binding_constructor:<gltrnsfrm>[00m
property 'rotation-x' on class 'GstGLTransformation' needs to be writeable,
controlable and not construct_only
0:00:00.174733951 [336m 8309[00m       0xd1b750 [37mTRACE  [00m
[00;01;31;44m     GST_REFCOUNTING
gstobject.c:264:gst_object_unref:<gltrnsfrm>[00m 0x10a60e0 unref 4->3

(python3:8309): GStreamer-CRITICAL **: 10:37:00.609:
gst_object_add_control_binding: assertion 'binding->pspec' failed


Now as per the man page of 'gltransformation', the element properties
rotation-x/y/z are readable and writeable.

 #gst-inspect-1.0 gltransformation
  translation-x       : Translates the video at the X-Axis, in universal
[0-1] coordinate.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:               0 
  translation-y       : Translates the video at the Y-Axis, in universal
[0-1] coordinate.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:               0 
  translation-z       : Translates the video at the Z-Axis, in universal
[0-1] coordinate.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:               0 
  rotation-x          : Rotates the video around the X-Axis in degrees.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:               0 
  rotation-y          : Rotates the video around the Y-Axis in degrees.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:               0 
  rotation-z          : Rotates the video around the Z-Axis in degrees.
                        flags: readable, writable
                        Float. Range:   -3,402823e+38 -    3,402823e+38
Default:

 However, in this case the property is considered as not writable. here is
the source code for the  gstcontrolbinding
<https://github.com/ford-prefect/gstreamer/blob/master/gst/gstcontrolbinding.c>  
.  
Does anyone know why this is causing an issue in this case.




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