[gst-devel] Snapshot script - strange gobject/gtype conflict

[Olivier Aubert]

Replying to myself, for the sake of completeness: I finally figured out
the issue, which is an incompatibility between playbin and playbin2 (I
accidentally used each one for my 2 pipelines). Using only playbin works
OK.
I filed a bug report against it (#589622).

Olivier

On Tue, 2009-07-21 at 23:55 +0200, Olivier Aubert wrote:
> Hello
> 
> I have just implemented a snapshot-taking module through a dedicated
> "playbin ! ffmpegcolorspace ! pngenc"  pipeline, ending in a custom sink
> named notifysink, which can then be used to process/save the resulting
> PNGs. It is inspired by the code in Pitivi, but without its dependencies
> on the whole framework which made it un-reusable as is. 
> 
> The code is available at
> http://svn.gna.org/viewcvs/advene/trunk/lib/advene/util/snapshotter.py
> and it works well in standalone mode as a script, invoked by
> 
> snapshotter.py movie.avi 1200 5400 2800 [list of timestamps...]
> 
> or in interactive mode (through a pygtk evaluator which allows
> interactive use, download also
> http://svn.gna.org/viewcvs/advene/trunk/lib/advene/gui/evaluator.py
> if  you want to try it interactively).
> 
> However, a problem arises when I try to use the module in my
> application, which already has a running gst pipeline (to play the
> video). Simply adding these two lines to the script (see the comment at
> the end of snapshotter.py) exhibits the same issue:
>         pipe=gst.parse_launch('playbin uri=file:///media/video/Bataille.avi')
>         pipe.set_state(gst.STATE_PLAYING)
> 
> It raises various warnings/errors, and locks the snapshot pipeline (a
> player.get_state() not even returns) :
> 
> sys:1: Warning: cannot register existing type `GstSelectorPad'
> sys:1: Warning: g_object_new: assertion `G_TYPE_IS_OBJECT (object_type)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_event_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_getcaps_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_chain_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_internal_link_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_bufferalloc_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_active: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_element_add_pad: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_event_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_getcaps_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_chain_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_internal_link_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_bufferalloc_function: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_pad_set_active: assertion `GST_IS_PAD (pad)' failed
> 
> (snap.py:26756): GStreamer-CRITICAL **: gst_element_add_pad: assertion `GST_IS_PAD (pad)' failed
> 
> 
> I did not manage to find out if it was a gobject-specific issue, or a
> gst-specific one. Does anyone have a clue ?
> 
> Thanks
> Olivier
> 
> 
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