.
Thread 4 (Thread 0x7f12ebfff700 (LWP 30087)):
#0  0x00007f130d2c8839 in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f131314df2a in g_cond_wait_until () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f13130db4f1 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f13130dbaac in g_async_queue_timeout_pop () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f13131308ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f131312fe05 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f130d5a56db in start_thread (arg=0x7f12ebfff700) at pthread_create.c:463
        pd = 0x7f12ebfff700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139719245559552, 8092826330344664354, 139719245556800, 0, 94266766056304, 140721362759984, -8184543191628829406, -8184900759899656926}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#7  0x00007f130d2ce88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 3 (Thread 0x7f12faa1c700 (LWP 26989)):
#0  0x00007f130d2c1bf9 in __GI___poll (fds=0x55bc31685040, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f1313108439 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f131310854c in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1313108591 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f131312fe05 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f130d5a56db in start_thread (arg=0x7f12faa1c700) at pthread_create.c:463
        pd = 0x7f12faa1c700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139719491045120, 8092826330344664354, 139719491042368, 0, 94266771372832, 140721362758544, -8184575544006857438, -8184900759899656926}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f130d2ce88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 2 (Thread 0x7f12fa21b700 (LWP 26990)):
#0  0x00007f130d2c1bf9 in __GI___poll (fds=0x55bc316ab520, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007f1313108439 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f13131087d2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f130e41ae16 in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f131312fe05 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f130d5a56db in start_thread (arg=0x7f12fa21b700) at pthread_create.c:463
        pd = 0x7f12fa21b700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139719482652416, 8092826330344664354, 139719482649664, 0, 94266771373056, 140721362758928, -8184576642981614302, -8184900759899656926}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
#6  0x00007f130d2ce88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
.
Thread 1 (Thread 0x7f131417aac0 (LWP 26988)):
#0  0x00007f1310ca4bbd in sws_scale () at /usr/lib/x86_64-linux-gnu/libswscale.so.4
#1  0x000055bc2faeed2e in  ()
#2  0x000055bc2faef941 in  ()
#3  0x000055bc2fbb4296 in  ()
#4  0x000055bc2fbb40d9 in  ()
#5  0x000055bc2fbb30ac in  ()
#6  0x000055bc2fbb323a in  ()
#7  0x000055bc2fbb4b2c in  ()
#8  0x000055bc2fbb2f1f in  ()
#9  0x000055bc2fbb42f4 in  ()
#10 0x000055bc2fbb7212 in  ()
#11 0x000055bc2fbb7e26 in  ()
#12 0x000055bc2fbb75fb in  ()
#13 0x000055bc2fbb7cfd in  ()
#14 0x000055bc2fbb23c5 in  ()
#15 0x000055bc2fb7d886 in  ()
#16 0x000055bc2fb819d7 in  ()
#17 0x000055bc2fb68137 in  ()
#18 0x000055bc2fb6a3bc in  ()
#19 0x000055bc2fb6abbc in  ()
#20 0x000055bc2fb817a2 in  ()
#21 0x000055bc2fb8268d in  ()
#22 0x000055bc2fb5429c in  ()
#23 0x00007f1313682548 in Glib::SignalProxyNormal::slot0_void_callback(_GObject*, void*) () at /usr/lib/x86_64-linux-gnu/libglibmm-2.4.so.1
#24 0x00007f13133e1f6d in g_closure_invoke () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007f13133f48d1 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007f13133fd3f5 in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x00007f13133fde0f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#28 0x00007f130f17a6f5 in  () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#29 0x00007f13133e1f6d in g_closure_invoke () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#30 0x00007f13133f4e0e in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#31 0x00007f13133fd3f5 in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#32 0x00007f13133fde0f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#33 0x00007f130f179679 in  () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#34 0x00007f130f21f38b in  () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#35 0x00007f13133e1f6d in g_closure_invoke () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#36 0x00007f13133f4ac8 in  () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#37 0x00007f13133fcd8f in g_signal_emit_valist () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#38 0x00007f13133fde0f in g_signal_emit () at /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#39 0x00007f130f3352bc in  () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#40 0x00007f130f21d62c in gtk_propagate_event () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#41 0x00007f130f21da2b in gtk_main_do_event () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#42 0x00007f130ee9302c in  () at /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#43 0x00007f1313108287 in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007f13131084c0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007f13131087d2 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#46 0x00007f130f21ca37 in gtk_main () at /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#47 0x00007f1310642d66 in Gtk::Main::run(Gtk::Window&) () at /usr/lib/x86_64-linux-gnu/libgtkmm-2.4.so.1
#48 0x000055bc2fb79d4b in  ()
#49 0x000055bc2facdf90 in  ()
#50 0x00007f130d1ceb97 in __libc_start_main (main=0x55bc2facded0, argc=1, argv=0x7ffc3ed70b08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc3ed70af8) at ../csu/libc-start.c:310
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -2650613373170930398, 94266742095840, 140721362766592, 0, 0, -8090994883701035742, -8184900266596684510}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7f1313fdd733 <_dl_init+259>, 0x7f1313fcba38}, data = {prev = 0x0, cleanup = 0x0, canceltype = 335402803}}}
        not_first_call = <optimized out>
#51 0x000055bc2fad400a in  ()