qtgstreamer build issues - Win32

Fri Aug 17 12:43:03 PDT 2012

I agree that the qt gstreamer build appears suspect. What I'm unsure of is
how it could get in the way of registering basic gobjects. Was the qt
gstreamer build built against the same glib as gstreamer? If so, I'm not
sure what to tell you without deep diving into the build...

From: Dinesh Kumar [mailto:dineshkpadmanaban at gmail.com] 
Sent: Friday, August 17, 2012 12:39 PM
To: Discussion of the development of and with GStreamer; dhoyt at hoytsoft.org
Subject: Re: qtgstreamer build issues - Win32

Hi David,

Thank you very much for your help. I have deleted the registry and tried the
same. The results are same. 

I have one strange observation. 

           - When there is no gstqtvideosink(qt gstreamer element) in the
plugin folder, gst-launch and gst-inspect(displays all the plugins) works as
expected. 

          - When the gstqtvideosink is present in the plugin folder,
gst-launch and gst-inspect throw those errors. 

          The moment i remove the gstqtvideosink from the plugin folder,
gst-launch and gst-inspect works as expected. I think this is enough to
confirm the issue is with qtgstreamer build not the glib/gobject ? Can you
please confirm. 

Thanks

Dinesh P

On Fri, Aug 17, 2012 at 11:56 PM, David Hoyt <dhoyt at hoytsoft.org> wrote:

Seems like either an issue with your glib build or your gstreamer build. But
you said that gst-launch ran successfully. Were you able to run gst-inspect?
If so, did it list out all the plugins?

I would first delete the registry and try again. Look for it in
C:\Users\<account>\.gstreamer-0.10\registry.i586.bin or something like that
IIRC. I might also try and use the gstreamer SDK, copy the qt gstreamer
plugins into the plugin folder (typically <installation
dir>\lib\gstreamer-0.10\ IIRC), their dependencies to the bin\ folder,
delete the registry file, and try again. That could help isolate whether the
problem is your glib/gstreamer build or the qt gstreamer build.

But really, the fact that it's failing on registering "GstObject" is a major
problem and something doesn't smell right.

HTH,
- David Hoyt

From: gstreamer-devel-bounces+dhoyt=hoytsoft.org at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+dhoyt
<mailto:gstreamer-devel-bounces%2Bdhoyt>
=hoytsoft.org at lists.freedesktop.org] On Behalf Of Dinesh Kumar
Sent: Friday, August 17, 2012 5:28 AM
To: gstreamer-devel at lists.freedesktop.org
Subject: Re: qtgstreamer build issues - Win32

Hi, 

I have few more pointers to add

   -> There were some errors in my qtgstreamer build. (gstqtvideosink did
not get build). I think this is the cause for the error mentioned in the
previous mail. I have overlooked the errors, as Cmake and MSVC successfully
created the player.exe and other binaries :(. 

   -> After building gstqtvideosink successfully, I observed a strange
behaviour. 

          When I try to run player.exe I got the below errors.

(player.exe:4632): GLib-GObject-WARNING **: cannot register existing type
`GstObject'

(player.exe:4632): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4632): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed

(player.exe:4632): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4632): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed

(player.exe:4632): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4632): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed

(player.exe:4632): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed

(player.exe:4632): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4632): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed\

(player.exe:4632): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4632): GStreamer-CRITICAL **: gst_element_register: assertion
`g_type_is_a (type, GST_TYPE_ELEMENT)' failed

 -> Then I tried running gst-launch.exe, I got the below errors. 

(gst-launch-0.10:592): GLib-GObject-WARNING **: cannot register existing
type `GstObject'

(gst-launch-0.10:592): GLib-CRITICAL **: g_once_init_leave: assertion
`result != 0' failed

(gst-launch-0.10:592): GLib-GObject-CRITICAL **: g_type_register_static:
assertion `parent_type > 0' failed

(gst-launch-0.10:592): GLib-CRITICAL **: g_once_init_leave: assertion
`result != 0' failed

(gst-launch-0.10:592): GStreamer-CRITICAL **: gst_element_register:
assertion `g_type_is_a (type, GST_TYPE_ELEMENT)' failed

  -> If I remove the "gstqtvideosink" from gst_plugin_path, I can able to
run the gst-launch successfully. 

  -> I think, there is some issue with the "gstqtvideosink". 

I am using qtgstreamer-0.10.2. I am new to windows development environment.
Your pointers could be of great help to me. 

Regards

Dinesh P

On Thu, Aug 16, 2012 at 6:21 PM, Dinesh Kumar <dineshkpadmanaban at gmail.com>
wrote:

Hi, 

I am not sure, if this is the right forum for this question. I could not
find any other related forum for qtgstreamer related queries. 

I have compiled gstreamer for win32 following the procedure
http://gstreamer.freedesktop.org/wiki/BuildGStreamerWithMinGWAndMsys

I have used precompiled binaries for all the packages, except gstreamer as I
have modified the source. 

I can able to run gst-launch successfully.

I have compiled qtgstreamer following the procedure
http://gstreamer.freedesktop.org/wiki/QtGStreamer/BuildingOnWindows.  I had
issues in CMake finding my gstreamer installation path, since msys
environment build system did not generate .lib files.  I have generated .def
and .lib using "dumpbin" and "lib" tools and compiled qtgstreamer
successfully. 

When I try to run qtgstreamer examples (player, recorder, voip), I get
following errors. 

(player.exe:4232): GLib-GObject-WARNING **: cannot register existing type
`GstOject'

(player.exe:4232): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4232): GLib-GObject-CRITICAL **: g_type_register_static:
assertionparent_type > 0' failed

(player.exe:4232): GLib-CRITICAL **: g_once_init_leave: assertion `result !=
0'failed

(player.exe:4232): GLib-GObject-WARNING **: interface type
`GstImplementsInterfce' or prerequisite type `<invalid>' invalid

I double checked that GST_PLUGIN_PATH is set correct. I have also cross
checked by successfully launching gst-launch on the same shell. 

Please help me. Do I need to set anyother env variables? 

Thanks

Dinesh P

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