Comment 2 for bug 1290750

StacktraceTop:
 gst_mini_object_unlock (object=0x7f8cc91d8010, flags=flags@entry=GST_LOCK_FLAG_EXCLUSIVE) at gstminiobject.c:241
 _gst_buffer_free (buffer=0x7f8cdcece020) at gstbuffer.c:577
 gst_mini_object_replace (olddata=olddata@entry=0x7f8cdc360a10, newdata=0x0) at gstminiobject.c:513
 gst_buffer_replace (nbuf=<optimized out>, obuf=0x7f8cdc360a10) at /usr/include/gstreamer-1.0/gst/gstbuffer.h:475
 gst_ffmpegviddec_video_frame (ffmpegdec=ffmpegdec@entry=0x7f8cdc067c60, data=<optimized out>, data@entry=0x7f8cdc3e8970 "", size=<optimized out>, frame=frame@entry=0x7f8cd80a0e50, ret=ret@entry=0x7f8cea5ed31c) at gstavviddec.c:1229