[Kdenlive-devel] Segfault after 30 MyThread::run

[Simon Eugster]

Hi Mario,

After 30 runs? I never noticed this. I'm battling with this segfault
for quite some time already now.
http://www.kdenlive.org/mantis/view.php?id=1761

Just tested – here it is after 72 times (if I counted correctly) all time.

Simon

2010/11/28 Mario Theodoridis <mario at schmut.com>:
> Hi,
> i'm new to this list. I'm also new to video editing, or developing the editor
> for that matter. I'm trying to put together a video using a lot of stills and
> video clips. I started by assembling all the clips i wanted to use. There are
> around 270 of them. Then i started to assemble some footage.
> Somewhere along the lines kdenlive started segfaulting.
>
> So i got the source for mlt (git)  and kdenlive (svn), removed the packages,
> built debug versions and ran kdenlive under kdevelop.
>
> I turned on logging for kdenlive and find that after 30 runs of MyThread::run
> things segfault in mlt_properties_find
>        property_list *list = this->local;
> because 'this' is null. The stack looks like this:
>
> #0 mlt_properties_find() at
> /data/netlocal/foss/video/mlt/src/framework/mlt_properties.c:347
> #1 mlt_properties_get_int() at
> /data/netlocal/foss/video/mlt/src/framework/mlt_properties.c:719
> #2 producer_set_up_video() at
> /data/netlocal/foss/video/mlt/src/modules/avformat/producer_avformat.c:1604
> #3 producer_get_frame() at
> /data/netlocal/foss/video/mlt/src/modules/avformat/producer_avformat.c:2221
> #4 producer_get_frame() at
> /data/netlocal/foss/video/mlt/src/framework/mlt_producer.c:577
> #5 mlt_service_get_frame() at
> /data/netlocal/foss/video/mlt/src/framework/mlt_service.c:480
> #6 Mlt::Service::get_frame(int)() at /home/mario/usr/lib/libmlt++.so.3:-1
> #7 MyThread::run() at /data/netlocal/foss/video/kdenlive/src/kthumb.cpp:89
> #8 QThreadPrivate::start() at thread/qthread_unix.cpp:265
> #9 start_thread() at pthread_create.c:303
> #10 clone() at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> #11 ??() at :-1
>
>
> It's not clear to me which list is the right one for this, as it crashes in
> mlt, but always does after 30 mythread runs.
>
> I've been staring at this code for a day trying to fix it, but am currently
> still rather clueless as to how a lot of it functions. I was hoping to get
> some insight on why this might be happening, so that i or someone else can fix
> it. Unless i'm doing something wrong, in which case i would appreciate some
> cluesticks in that regard.
>
> This all is happening on Kubuntu Maverik 64bit.
>
> Please let me know if this is the wrong list, or more info is needed.
>
> Thanks in advance
>
> Mario
>
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