https://bugs.kde.org/show_bug.cgi?id=361086

--- Comment #10 from Evert Vorster <evert.vors...@yandex.com> ---
Hi there, JBM. 

Thanks for looking into this bug. 
As stated earlier, I can trigger it by just switching between clip and project
monitors. 

Unfortunately, the latest canges (2016-06-03) has not cured the problem. 

Here is another backtrace from the latest git. 
I have only included the backtrace of the affected thread:

kdenlive: effect_chain.cpp:1778: void movit::EffectChain::render_to_fbo(GLuint,
unsigned int, unsigned int): Assertion `status == GL_FRAMEBUFFER_COMPLETE'
failed.

Thread 56 "RenderThread" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffa1805700 (LWP 20918)]
0x00007fffefb59295 in raise () from /usr/lib/libc.so.6
(gdb) thread apply all bt

Thread 56 (Thread 0x7fffa1805700 (LWP 20918)):
#0  0x00007fffefb59295 in raise () from /usr/lib/libc.so.6
#1  0x00007fffefb5a6da in abort () from /usr/lib/libc.so.6
#2  0x00007fffefb52297 in __assert_fail_base () from /usr/lib/libc.so.6
#3  0x00007fffefb52342 in __assert_fail () from /usr/lib/libc.so.6
#4  0x00007fffd84d432a in movit::EffectChain::render_to_fbo
(this=this@entry=0x7fff3045b670, dest_fbo=2, width=<optimized out>, 
    width@entry=1920, height=height@entry=1080) at effect_chain.cpp:1778
#5  0x00007fffd873fa0f in GlslManager::render_frame_texture (this=0x1ce4520,
chain=0x7fff3045b670, frame=0x7fff2f7df140, width=1920, 
    height=1080, image=0x7fffa1804d98) at filter_glsl_manager.cpp:404
#6  0x00007fffd8742af0 in convert_image (frame=0x7fff2f7df140,
image=0x7fffa1804d98, format=0x1d7112c, 
    output_format=mlt_image_glsl_texture) at filter_movit_convert.cpp:573
#7  0x00007ffff6d86058 in mlt_frame_get_image (self=self@entry=0x7fff2f7df140,
buffer=buffer@entry=0x7fffa1804d98, 
    format=format@entry=0x1d7112c, width=width@entry=0x7fffa1804d84,
height=height@entry=0x7fffa1804d88, writable=writable@entry=0)
    at mlt_frame.c:591
#8  0x00007ffff6d9bf99 in producer_get_image (self=self@entry=0x7fff23be65e0,
buffer=buffer@entry=0x7fffa1804d98, 
    format=format@entry=0x1d7112c, width=width@entry=0x7fffa1804d84,
height=height@entry=0x7fffa1804d88, writable=writable@entry=0)
    at mlt_tractor.c:370
#9  0x00007ffff6d86007 in mlt_frame_get_image (self=self@entry=0x7fff23be65e0,
buffer=buffer@entry=0x7fffa1804d98, 
    format=format@entry=0x1d7112c, width=width@entry=0x7fffa1804d84,
height=height@entry=0x7fffa1804d88, writable=writable@entry=0)
    at mlt_frame.c:585
#10 0x00007ffff6d99724 in consumer_read_ahead_thread (arg=0x2d753a0) at
mlt_consumer.c:825
#11 0x0000000000722bcd in RenderThread::run (this=0x7fff6c013ad0)
    at
/tmp/yaourt-tmp-evert/aur-kdenlive-git/src/kdenlive/src/monitor/glwidget.cpp:1229
#12 0x00007ffff05fd1d8 in ?? () from /usr/lib/libQt5Core.so.5
#13 0x00007fffee0cb474 in start_thread () from /usr/lib/libpthread.so.0
#14 0x00007fffefc0d69d in clone () from /usr/lib/libc.so.6

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