UI toolkit introduced dependency on two versions of gstreamer on the desktop

I confirm this bug with my app "Saucy Bacon". When I try to run it (even if I don't use audio output) I get the same error and then I have to kill the process.

Starting /usr/lib/x86_64-linux-gnu/qt5/bin/qmlscene...
virtual void OnlineAccounts::Plugin::registerTypes(const char*) Ubuntu.OnlineAccounts
virtual void FriendsPlugin::registerTypes(const char*) Friends
unity::action::ActionManager::ActionManager(QObject*):
 Could not determine application identifier. HUD will not work properly.
 Provide your application identifier in $APP_ID environment variable.

(qmlscene:10566): GLib-GObject-WARNING **: cannot register existing type 'GstFormat'

(qmlscene:10566): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:10566): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

(qmlscene:10566): GLib-GObject-WARNING **: cannot register existing type 'GstQuery'

(qmlscene:10566): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:10566): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

(qmlscene:10566): GLib-GObject-WARNING **: cannot register existing type 'GstObject'

(qmlscene:10566): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:10566): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'
The program has unexpectedly finished.

Thanks

Giulio

This is occurring with the update in the archive made today
qtdeclarative5-ubuntu-ui-toolkit-plugin 0.1.46+13.10.20131007-0ubuntu1

This issue occurs with cordova apps too.

This seems to be related to change 781 that added the thumbnailer and a dep on gstreamer1.0, so on the desktop we still have qt deps on gst0.1.

This file works on the touch image.

Installing the -touch versions of the relevant qtmultimedia packages shows this working on the desktop. These packages use gst1.0

 libqgsttools-p1-touch libqt5multimedia5-touch libqt5multimedia5-touch-plugins libqt5multimediaquick-p5-touch qtdeclarative5-qtmultimedia-touch-plugin

This only works fine on the touch image as we use qtmultimedia-touch by default (which is a forked version that supports decode with gst1.0, but lacks a few features, such as camera, record, etc).

I wouldn't recommend the sdk to depend on our forked version as we'd be forcing anyone using the sdk to use our qtmultimedia fork instead, which might break a few qtmultimedia based use cases.

This will hopefully be fixed with qt 5.2, but for now I'd still recommend desktop to depend on the original qtmultimedia package, and drop the thumbnailer dependency/support in the toolkit.

I can confirm that 0.1.46+13.10.20131007-0ubuntu1 in saucy now is also affected. Furthermore, Video{} no longer works as demonstrated by the attached click package. Install with:
$ sudo click install --user=$USER --force-missing-framework ./com.ubuntu.developer.jdstrand.test-video_0.1_all.click

Start with:
$ cd /opt/click.ubuntu.com/com.ubuntu.developer.jdstrand.test-video/current
$ qmlscene ./test-video.qml
unity::action::ActionManager::ActionManager(QObject*):
 Could not determine application identifier. HUD will not work properly.
 Provide your application identifier in $APP_ID environment variable.

(qmlscene:9989): GLib-GObject-WARNING **: cannot register existing type 'GstFormat'

(qmlscene:9989): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:9989): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

(qmlscene:9989): GLib-GObject-WARNING **: cannot register existing type 'GstQuery'

(qmlscene:9989): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:9989): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

(qmlscene:9989): GLib-GObject-WARNING **: cannot register existing type 'GstObject'

(qmlscene:9989): GLib-CRITICAL **: g_once_init_leave: assertion 'result != 0' failed

(qmlscene:9989): GLib-GObject-WARNING **: cannot retrieve class for invalid (unclassed) type '<invalid>'

Downgrading to 0.1.46+13.10.20130925.1-0ubuntu2 allows the app to work again.

Potential fixes which don't required removing thumbnailer altogether (which would be nice since we really need it)

- change build system of the sdk to only build thumbnailing support on the phone
- disable embedded album art provider in thumbnailer, because it is the only part that uses GStreamer and is in the same process (video is done out-of-process)

The latter is not a regression as embedded album art never worked in earlier releases.

Here is an experimental thumbnailer branch to do the latter:

lp:~jpakkane/thumbnailer/gst-disable

Please test if it works for you.

Like bzoltan, I can confirm that the Jussi's branch fixes Jamie's #8 test case.

Built now at the daily build PPA. To get it testable on device:

apt-add-repository ppa:ubuntu-unity/daily-build
apt-get update
apt-get install libthumbnailer0 # check that version is 1.0+13.10.20131008-0ubuntu1
reboot

bug #1236940 filed but so far sounds like not related to this upgrade?

This bug was fixed in the package thumbnailer - 1.0+13.10.20131008-0ubuntu1

---------------
thumbnailer (1.0+13.10.20131008-0ubuntu1) saucy; urgency=low

  [ Jussi Pakkanen ]
  * Fix off by one error. (LP: #1235444)
  * Disable use of in-process GStreamer because we use 1.0, which
    clashes with 0.10. (LP: #1235484)

  [ Ubuntu daily release ]
  * Automatic snapshot from revision 55
 -- Ubuntu daily release <email address hidden> Tue, 08 Oct 2013 12:49:51 +0000