#0  0x00007fffc0061220 in ?? ()
#1  0x00007ffff51b9728 in video_orc_unpack_NV12 (
    d1=d1@entry=0x7fff8803d570 "\030\a", s1=s1@entry=0x0, 
    s2=s2@entry=0x0, n=n@entry=960) at tmp-orc.c:5030
#2  0x00007ffff51989d0 in unpack_NV12 (info=<optimized out>, 
    flags=<optimized out>, dest=0x7fff8803d570, 
    data=<optimized out>, stride=<optimized out>, 
    x=<optimized out>, y=676, width=1920) at video-format.c:1041
#3  0x00007ffff51b43e5 in gst_video_blend (dest=0x2f8, 
    src=0x7fff8803e2f4, x=0, y=0, global_alpha=-nan(0x7fffff))
    at video-blend.c:336
#4  0x00007ffff51b52ba in gst_video_overlay_composition_blend (
    comp=0x2381800, video_buf=0x7fff96584590)
    at video-overlay-composition.c:491
#5  0x00007fffae88761d in gst_base_text_overlay_push_frame (
    overlay=0xde3000, video_frame=0x7fffa065a730)
    at gstbasetextoverlay.c:1890
#6  0x00007fffae88a80a in gst_base_text_overlay_video_chain (
    pad=0x7fff88015fe0, parent=0xde3000, buffer=0x0)
    at gstbasetextoverlay.c:2483
#7  0x00007ffff4cc1aff in gst_pad_chain_data_unchecked (
    data=<optimized out>, type=<optimized out>, 
    pad=<optimized out>) at gstpad.c:3830
#8  gst_pad_push_data (pad=0x7fffb8125a90, type=2928186800, 
    data=0x7fffa065a730) at gstpad.c:4063
#9  0x00007fffefbc99ac in gst_base_transform_chain (
    pad=0x7fff96583d60, parent=0x7fff880118d0, buffer=0x0)
    at gstbasetransform.c:2260
#10 0x00007ffff4cc1aff in gst_pad_chain_data_unchecked (
    data=<optimized out>, type=<optimized out>, 
    pad=<optimized out>) at gstpad.c:3830
#11 gst_pad_push_data (pad=0x7fff980316b0, type=4022114128, 
    data=0x7fffa065a730) at gstpad.c:4063
#12 0x00007ffff4cc8e66 in gst_pad_push (
    pad=pad@entry=0x7fff980316b0, 
    buffer=buffer@entry=0x7fffa065a730) at gstpad.c:4174
#13 0x00007ffff4cb23e3 in gst_proxy_pad_chain_default (
    pad=0x7fffb811a780, parent=<optimized out>, 
    buffer=0x7fffa065a730) at gstghostpad.c:126
#14 0x00007fffdea4ed54 in gst_subtitle_overlay_video_sink_chain (
    pad=0x7fffb811a780, parent=0xd06b30, buffer=0x7fffa065a730)
    at gstsubtitleoverlay.c:1731
#15 0x00007ffff4cc1aff in gst_pad_chain_data_unchecked (
    data=<optimized out>, type=<optimized out>, 
    pad=<optimized out>) at gstpad.c:3830
#16 gst_pad_push_data (pad=0x7fffb80ddad0, type=3735350560, 
    data=0x7fffa065a730) at gstpad.c:4063
#17 0x00007fffddf82a68 in gst_queue_push_one (
    queue=<optimized out>) at gstqueue.c:1118
#18 gst_queue_loop (pad=0x7fff96583d60) at gstqueue.c:1247
#19 0x00007ffff4cf06b7 in gst_task_func (task=0x17cb5f0)
    at gsttask.c:317
#20 0x00007ffff63c8108 in g_thread_pool_thread_proxy (
    data=<optimized out>) at gthreadpool.c:307
#21 0x00007ffff63c7775 in g_thread_proxy (data=0x7fffa8372590)
    at gthread.c:764
#22 0x00007ffff61400f4 in start_thread (arg=0x7fff96585700)
    at pthread_create.c:309
#23 0x00007ffff5e744bd in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
