Overview: Kdenlive crashes every time I try to add a "fade from black" effect after a "fade to black" effect to my timeline and play it back.

I'm using the flatpak version of Kdenlive, 18.04

Steps to reproduce:
1. Open project file
2. Add a "fade to black" effect on first clip
3. Add a "fade from black" on the second clip
4. Play back both clips.

Reproducible: Always

Output of running kdenlive in gdb:

[New LWP 318]
[h264 @ 0x7fff73abe340] mmco: unref short failure

Thread 114 "RenderThread" received signal SIGSEGV, Segmentation fault.
[Switching to LWP 300]
MltInput::set_pixel_data (this=this@entry=0x0, data=0x7ffe589e3480 '\020' <repeats 200 times>...)
    at mlt_movit_input.cpp:60
60		assert(input);

Output of "thread apply all bt" in gdb:

Thread 132 (LWP 318):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 131 (LWP 317):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 130 (LWP 316):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 129 (LWP 315):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 128 (LWP 314):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 127 (LWP 313):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 126 (LWP 312):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 125 (LWP 311):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 124 (LWP 310):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 123 (LWP 309):
---Type <return> to continue, or q <return> to quit---
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 122 (LWP 308):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 121 (LWP 307):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 120 (LWP 306):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 119 (LWP 305):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 118 (LWP 304):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 117 (LWP 303):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 116 (LWP 302):
#0  0x00000031308b80dd in nanosleep () at /lib/libc.so.6
#1  0x00007fffc3c0ef45 in video_thread (arg=0x35651a0) at consumer_sdl2_audio.c:496
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 115 (LWP 301):
#0  0x00000031308df631 in ppoll () at /lib/libc.so.6
#1  0x00007fffea89e60d in pa_mainloop_poll () at /lib/libpulse.so.0
#2  0x00007fffea89ebfe in pa_mainloop_iterate () at /lib/libpulse.so.0
#3  0x00007fffc4538447 in  () at /usr/lib/libSDL2-2.0.so.0
#4  0x00007fffc4498785 in  () at /usr/lib/libSDL2-2.0.so.0
#5  0x00007fffc44e0a3c in  () at /usr/lib/libSDL2-2.0.so.0
#6  0x00007fffc4550219 in  () at /usr/lib/libSDL2-2.0.so.0
#7  0x0000003131007444 in  () at /lib/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#8  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 114 (LWP 300):


#0  0x00007fffc2fbf684 in MltInput::set_pixel_data(unsigned char const*) (this=this@entry=0x0, data=0x7ffe589e3480 '\020' <repeats 200 times>...) at mlt_movit_input.cpp:60
#1  0x00007fffc2fb9cb1 in set_movit_parameters(GlslChain*, mlt_service, mlt_frame) (chain=chain@entry=0x7fff730b6100, service=<optimized out>, frame=0x7fff71259ae0) at filter_movit_convert.cpp:349
#2  0x00007fffc2fb944d in set_movit_parameters(GlslChain*, mlt_service, mlt_frame) (chain=chain@entry=0x7fff730b6100, service=service@entry=0x88eb030, frame=frame@entry=0x7fff71c719a0)
    at filter_movit_convert.cpp:361
#3  0x00007fffc2fba394 in convert_image(mlt_frame, uint8_t**, mlt_image_format*, mlt_image_format) (frame=0x7fff71c719a0, image=0x7fff60ff8e38, format=0x1f3f80c, output_format=mlt_image_glsl_texture)
    at filter_movit_convert.cpp:573

#4  0x00007ffff716ce08 in mlt_frame_get_image (self=self@entry=0x7fff71c719a0, buffer=buffer@entry=0x7fff60ff8e38, format=format@entry=0x1f3f80c, width=width@entry=0x7fff60ff8e24, height=height@entry=0x7fff60ff8e28, writable=writable@entry=0) at mlt_frame.c:626
#5  0x00007ffff7181dc9 in producer_get_image (self=self@entry=0x7fff71a3ea00, buffer=buffer@entry=0x7fff60ff8e38, format=format@entry=0x1f3f80c, width=width@entry=0x7fff60ff8e24, height=height@entry=0x7fff60ff8e28, writable=writable@entry=0) at mlt_tractor.c:370
#6  0x00007ffff716cdb7 in mlt_frame_get_image (self=self@entry=0x7fff71a3ea00, buffer=buffer@entry=0x7fff60ff8e38, format=format@entry=0x1f3f80c, width=width@entry=0x7fff60ff8e24, height=height@entry=0x7fff60ff8e28, writable=writable@entry=0) at mlt_frame.c:620
#7  0x00007ffff717f49f in consumer_read_ahead_thread (arg=0x35651a0) at mlt_consumer.c:897
#8  0x000000000071fcfd in RenderThread::run() (this=0x7ffefc001a00)
    at /run/build/kdenlive/src/monitor/glwidget.cpp:1309
#9  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#10 0x0000003131007444 in  () at /lib/libpthread.so.0
#11 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 113 (LWP 299):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 112 (LWP 298):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc3c0ea3f in consumer_thread (duration=<synthetic pointer>, init_audio=<optimized out>, frame=0x7fff7047ce10, self=0x35651a0) at consumer_sdl2_audio.c:374
#2  0x00007fffc3c0ea3f in consumer_thread (arg=0x35651a0) at consumer_sdl2_audio.c:588
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 111 (LWP 297):
#0  0x00000031308df631 in ppoll () at /lib/libc.so.6
#1  0x00007fffea89e60d in pa_mainloop_poll () at /lib/libpulse.so.0
#2  0x00007fffea89ebfe in pa_mainloop_iterate () at /lib/libpulse.so.0
#3  0x00007fffea89ecb0 in pa_mainloop_run () at /lib/libpulse.so.0
#4  0x00007fffc45385ff in  () at /usr/lib/libSDL2-2.0.so.0
#5  0x00007fffc44e0a3c in  () at /usr/lib/libSDL2-2.0.so.0

#6  0x00007fffc4550219 in  () at /usr/lib/libSDL2-2.0.so.0
#7  0x0000003131007444 in  () at /lib/libpthread.so.0
#8  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 110 (LWP 296):
---Type <return> to continue, or q <return> to quit---
#0  0x000000313100d712 in pthread_cond_timedwait () at /lib/libpthread.so.0
#1  0x00007ffff0c09b4d in QWaitCondition::wait(QMutex*, unsigned long) () at /lib/libQt5Core.so.5
#2  0x00007ffff0bff53c in  () at /lib/libQt5Core.so.5
#3  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#4  0x0000003131007444 in  () at /lib/libpthread.so.0
#5  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 97 (LWP 283):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 96 (LWP 282):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 95 (LWP 281):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 94 (LWP 280):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 93 (LWP 279):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 92 (LWP 278):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 91 (LWP 277):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 90 (LWP 276):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 89 (LWP 275):
---Type <return> to continue, or q <return> to quit---
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 88 (LWP 274):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 87 (LWP 273):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 86 (LWP 272):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 85 (LWP 271):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 84 (LWP 270):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 83 (LWP 269):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 82 (LWP 268):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 81 (LWP 267):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 80 (LWP 266):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
---Type <return> to continue, or q <return> to quit---
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 79 (LWP 265):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 78 (LWP 264):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 77 (LWP 263):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 76 (LWP 262):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 75 (LWP 261):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 74 (LWP 260):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 73 (LWP 259):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 72 (LWP 258):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 71 (LWP 257):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6
---Type <return> to continue, or q <return> to quit---

Thread 70 (LWP 256):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 69 (LWP 255):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 68 (LWP 254):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 67 (LWP 253):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 66 (LWP 252):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 55 (LWP 241):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 54 (LWP 240):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 53 (LWP 239):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 52 (LWP 238):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 51 (LWP 237):
---Type <return> to continue, or q <return> to quit---
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 50 (LWP 236):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 49 (LWP 235):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 48 (LWP 234):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 47 (LWP 233):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 46 (LWP 232):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 45 (LWP 231):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 44 (LWP 230):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 43 (LWP 229):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 42 (LWP 228):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
---Type <return> to continue, or q <return> to quit---
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 41 (LWP 227):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 40 (LWP 226):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffc79e05ee in  () at /app/lib/libavcodec.so.58
#2  0x0000003131007444 in  () at /lib/libpthread.so.0
#3  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 24 (LWP 210):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#5  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0bfd978 in QThread::exec() () at /lib/libQt5Core.so.5
#7  0x00007ffff0bfda05 in QThread::run() () at /lib/libQt5Core.so.5
#8  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#9  0x0000003131007444 in  () at /lib/libpthread.so.0
#10 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 23 (LWP 209):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 22 (LWP 208):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 21 (LWP 207):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#5  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0bfd978 in QThread::exec() () at /lib/libQt5Core.so.5
---Type <return> to continue, or q <return> to quit---
#7  0x00007ffff0bfda05 in QThread::run() () at /lib/libQt5Core.so.5
#8  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#9  0x0000003131007444 in  () at /lib/libpthread.so.0
#10 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 20 (LWP 206):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 19 (LWP 205):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 18 (LWP 204):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 17 (LWP 203):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffea8acd51 in  () at /lib/libpulse.so.0
#2  0x00007fffea89e561 in pa_mainloop_poll () at /lib/libpulse.so.0
#3  0x00007fffea89ebfe in pa_mainloop_iterate () at /lib/libpulse.so.0
#4  0x00007fffea89ecb0 in pa_mainloop_run () at /lib/libpulse.so.0
#5  0x00007fffea8acc99 in  () at /lib/libpulse.so.0
#6  0x00007fffe9301858 in  () at /usr/lib/pulseaudio/libpulsecommon-10.0.so
#7  0x0000003131007444 in  () at /lib/libpthread.so.0
#8  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 15 (LWP 199):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#5  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0bfd978 in QThread::exec() () at /lib/libQt5Core.so.5
#7  0x00007ffff1b0140e in  () at /lib/libQt5Qml.so.5
#8  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#9  0x0000003131007444 in  () at /lib/libpthread.so.0
#10 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 13 (LWP 197):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#5  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0bfd978 in QThread::exec() () at /lib/libQt5Core.so.5
#7  0x00007ffff1b0140e in  () at /lib/libQt5Qml.so.5
#8  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#9  0x0000003131007444 in  () at /lib/libpthread.so.0
#10 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 11 (LWP 195):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#5  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0bfd978 in QThread::exec() () at /lib/libQt5Core.so.5
#7  0x00007ffff2619172 in  () at /lib/libQt5DBus.so.5
#8  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#9  0x0000003131007444 in  () at /lib/libpthread.so.0
#10 0x00000031308e827f in clone () at /lib/libc.so.6

Thread 10 (LWP 194):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 9 (LWP 193):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 8 (LWP 192):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 7 (LWP 191):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6
---Type <return> to continue, or q <return> to quit---

Thread 6 (LWP 190):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 5 (LWP 189):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 4 (LWP 188):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 3 (LWP 187):
#0  0x000000313100d353 in pthread_cond_wait () at /lib/libpthread.so.0
#1  0x00007fffd902b30b in  () at /lib/dri/radeonsi_dri.so
#2  0x00007fffd902b027 in  () at /lib/dri/radeonsi_dri.so
#3  0x0000003131007444 in  () at /lib/libpthread.so.0
#4  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 2 (LWP 186):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffef68cd00 in  () at /lib/libxcb.so.1
#2  0x00007fffef68ea99 in xcb_wait_for_event () at /lib/libxcb.so.1
#3  0x00007fffe7dd8eaf in  () at /lib/libQt5XcbQpa.so.5
#4  0x00007ffff0c095f3 in  () at /lib/libQt5Core.so.5
#5  0x0000003131007444 in  () at /lib/libpthread.so.0
#6  0x00000031308e827f in clone () at /lib/libc.so.6

Thread 1 (LWP 182):
#0  0x00000031308df56d in poll () at /lib/libc.so.6
#1  0x00007fffeab153c6 in  () at /lib/libglib-2.0.so.0
#2  0x00007fffeab154dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#3  0x00007ffff0e24a32 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#4  0x00007fffe7e75741 in  () at /lib/libQt5XcbQpa.so.5
#5  0x00007ffff0dc74fb in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#6  0x00007ffff0dc7941 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
    at /lib/libQt5Core.so.5
#7  0x00007ffff0dd1646 in QCoreApplication::exec() () at /lib/libQt5Core.so.5
#8  0x00007ffff1186b46 in QGuiApplication::exec() () at /lib/libQt5Gui.so.5
#9  0x00007ffff2807faf in QApplication::exec() () at /lib/libQt5Widgets.so.5
#10 0x00000000004901ae in main(int, char**) (argc=<optimized out>, argv=<optimized out>)
    at /run/build/kdenlive/src/main.cpp:164