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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0003250||Kdenlive||MLT||public||2014-03-31 00:46||2014-03-31 02:26|
|Platform||kubuntu 64 bit||OS||Kubuntu||OS Version||13.10 saucy|
|Product Version||Recent git|
|Target Version||Fixed in Version|
|Summary||0003250: Support for MLT threads > 1 is broken (with patch: very jerky) after OpenGL integration|
|Description||I am using the sunab PPA.|
Since a recent update of kdenlive (I think the version from 15-03-2014), kdenlive crashes always when trying to add a clip to the project or opening an existing project.
This did not happen with the previous version, I could still use kdenlive on 12-03-2014 without problems.
Below a gdb backtrace and attached the KDE crash report. Please let me know if I can help testing or debugging.
|Steps To Reproduce||1. Start kdenlive|
2. Drag a clip into the project or add it using "Add file"
1. Open an existing project by clicking on it or by using "File -> Open"
|Additional Information||Program received signal SIGSEGV, Segmentation fault.|
QGLWidget::makeCurrent (this=0x0) at qgl.cpp:4034
4034 qgl.cpp: Datei oder Verzeichnis nicht gefunden.
#0 QGLWidget::makeCurrent (this=0x0) at qgl.cpp:4034
#1 0x00000000006ecd45 in Render::consumer_thread_stopped (self=0x1c8c470)
0000002 0x00007ffff48fdc8d in mlt_events_fire (self=self@entry=0x293aec0,
id=id@entry=0x7ffff490dbd7 "consumer-thread-stopped") at mlt_events.c:219
0000003 0x00007ffff4907012 in consumer_work_stop (self=0x293aec0) at mlt_consumer.c:1281
0000004 mlt_consumer_stop (self=0x293aec0) at mlt_consumer.c:1600
0000005 0x00007ffff46d7841 in Mlt::Consumer::stop() () from /usr/lib/libmlt++.so.3
0000006 0x0000000000702d2f in Render::setProducer (this=0x1c8c470, producer=0x0,
0000007 0x0000000000694bd0 in Monitor::slotSetClipProducer (this=0x1ad4ee0, clip=0x3b69550,
zone=..., forceUpdate=<optimised out>, position=0)
0000008 0x0000000000695800 in Monitor::qt_static_metacall (_o=0x1ad4ee0, _id=10524352,
_a=0xa096d0, _c=<optimised out>)
0000009 0x00007ffff4ca5a58 in QMetaObject::activate (sender=sender@entry=0x1baae10,
0000010 0x00000000006ad540 in ProjectList::clipSelected (this=this@entry=0x1baae10,
_t1=0x3b69550, _t2=..., _t3=_t3@entry=false)
|Tags||No tags attached.|
|Attached Files|| kdenlive-20140331-004136.kcrash.txt [^] (9,380 bytes) 2014-03-31 00:46 [Show Content]
kdenlive-stop-thread-crash.diff [^] (1,005 bytes) 2014-03-31 02:26 [Show Content]
This is interesting. It seems one out of two happened: Either you got a NULL QGLWidget when the consumer thread started, or consumer_thread_stopped() was called without consumer_thread_started() ever having called.
The former _should_ be impossible, so my bet would be on the second; it seems that for the read-ahead thread, the logic is water-proof, but that for some other kind of worker threads (whose mission I don't fully understand), consumer-thread-started only gets called once the first frame actually arrives.
I wonder if this is related to MLT's worker thread stuff. Do you think you could go into Settings -> Configure Kdenlive -> Environment and check that “Processing threads“ is at 1? I'm not sure how well anything else will work right now.
I'm impressed by your analysis - "Processing threads" was at 2 and after setting it to 1 and restarting kdenlive the issue is solved.
So my bad, it says "(> 1 is experimental)", don't even remember why I set it to 2, just trying it out I guess, and since until now there was no problem, I forgot all about it.
It seems like the included patch stops it from crashing (although not always?). It's still not a good user experience, though; adding more threads makes this very choppy.
I'm not sure what people want to do about this, and I don't know how mature MLT's support for multiple worker threads actually is in the end. Maybe the best thing to do would be to remove it, but I'm not in a position to know if it's a good idea or not. Keeping it open for now.
|2014-03-31 00:46||dode||New Issue|
|2014-03-31 00:46||dode||File Added: kdenlive-20140331-004136.kcrash.txt|
|2014-03-31 01:25||Sesse||Note Added: 0009842|
|2014-03-31 01:40||dode||Note Added: 0009843|
|2014-03-31 01:55||Sesse||Category||File Loading => MLT|
|2014-03-31 01:56||Sesse||Note Added: 0009844|
|2014-03-31 01:57||Sesse||Priority||normal => low|
|2014-03-31 01:57||Sesse||Summary||Crash when adding clip to project or opening existing project => Support for MLT threads > 1 is broken (with patch: very jerky) after OpenGL integration|
|2014-03-31 02:26||Sesse||File Added: kdenlive-stop-thread-crash.diff|
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