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vout: SIGSEGV in RenderPicture

sys->displayed.current is NULL when RenderPicture is called.

[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (1->0)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (0->1)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (1->0)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (0->1)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (1->0)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (0->1)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (1->0)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (0->1)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
[00007fff50018780] ts demux warning: scrambled state changed on pid 1623 (1->0)
[000055555564ece0] [qt] qt generic debug: on_player_program_list_changed
Thread 83 "vlc-vout" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fff301ff6c0 (LWP 3310125)]
RenderPicture (sys=sys@entry=0x7fff28086a90, render_now=render_now@entry=true) at ../../src/video_output/video_output.c:1244
1244	    picture_t *filtered = FilterPictureInteractive(sys);
(gdb) bt
#0  RenderPicture (sys=sys@entry=0x7fff28086a90, render_now=render_now@entry=true)
    at ../../src/video_output/video_output.c:1244
#1  0x00007ffff7cffd3d in DisplayPicture (vout=0x7fff28086a90) at ../../src/video_output/video_output.c:1486
#2  Thread (object=0x7fff28086a90) at ../../src/video_output/video_output.c:1791
#3  0x00007ffff7e28fd4 in  () at /lib/x86_64-linux-gnu/libc.so.6
#4  0x00007ffff7ea966c in  () at /lib/x86_64-linux-gnu/libc.so.6
(gdb) print sys->displayed.current
$1 = (picture_t *) 0x0
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