[Bug 412678] random segfaults or memory corruptions with multiple textoverlays (pango not reentrant)

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Mon Mar 14 01:48:34 PDT 2011

  GStreamer | gst-plugins-base | 0.10.x

--- Comment #18 from Stefan Kost (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> 2011-03-14 08:48:26 UTC ---
Having it in class init was not sufficient, as then I would free the pango
layout and pnago would release the type-plugins. I keep it now in _init() but
wrapped it with gonce (thanks for suggestion).

commit fee3266056b522cdd34e606b5682553d35eec5a1
Author: Stefan Kost <ensonic at users.sf.net>
Date:   Fri Mar 4 14:52:28 2011 +0200

    textoverlay: add a hack to init the pango engine

    Layout a single char to pre-create all resources.

I got no more crashers, but once these warnings:
(gst-launch-0.10:18177): Pango-WARNING **: failed to create cairo scaled font,
expect ugly output. the offending font is 'DejaVu Sans Mono 18'
(gst-launch-0.10:18177): Pango-WARNING **: font_face status is: no error has
(gst-launch-0.10:18177): Pango-WARNING **: scaled_font status is: invalid
matrix (not invertible)
(gst-launch-0.10:18177): Pango-WARNING **: shaping failure, expect ugly output.
shape-engine='BasicEngineFc', font='DejaVu Sans Mono 18', text='10:40:54'

That could still be a race or a different bug.

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