[Bug 767712] New: gst-launch / alpha: Launching the example alpha pipeline results in a segfault

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767712

            Bug ID: 767712
           Summary: gst-launch / alpha: Launching the example alpha
                    pipeline results in a segfault
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dunk.palmer at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Launching the example pipeline from gst-alpha.c results in a segfault:

gst-launch-1.0 videotestsrc pattern=snow ! mixer.sink_0 videotestsrc
pattern=smpte75 ! alpha method=green ! mixer.sink_1 videomixer name=mixer
sink_0::zorder=0 sink_1::zorder=1 ! videoconvert ! autovideosink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Caught SIGSEGV
#0  0x00007f1178c64fdd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f11791a3fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f11791a430a in g_main_loop_run ()
#3  0x00007f11796f6f97 in gst_bus_poll (bus=bus at entry=0x22baba0, 
#4  0x00000000004048f8 in event_loop (pipeline=0x2402160, 
#5  0x000000000040390e in main (argc=20, argv=0x7ffd79ca6208)

I'm successfully using the alpha element in a pipeline I build without the aid
of gst-launch, and the example pipeline in gst-alpha.c was updated recently
(there have been no meaningful changes since), so I'm thinking the problem may
not be in the alpha plugin.

I see this behaviour using release 1.8.0 and master (as of today).

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