gst-launch-0.10 playbin uri=file:///tmp/a-b.m4a
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Caught SIGSEGV accessing address 0x7fd100000000
#0  0x00007fd1532058bd in ?? ()
#1  0x0000000000000000 in ?? ()
Spinning.  Please run 'gdb gst-launch 13232' to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.
^CCaught interrupt -- handling interrupt.
Interrupt: Stopping pipeline ...

(gst-launch-0.10:13232): GLib-CRITICAL **: Source ID 1 was not found when attempting to remove it
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...