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

[Dan Dennedy]

On Sun, Nov 28, 2010 at 2:34 AM, Simon Eugster <simon.eu at gmail.com> wrote:
> 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

Let's keep this conversation on the bug ticket. Mario, will you please
add findings there?

> 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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>
> ------------------------------------------------------------------------------
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> Tap into the largest installed PC base & get more eyes on your game by
> optimizing for Intel(R) Graphics Technology. Get started today with the
> Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs.
> http://p.sf.net/sfu/intelisp-dev2dev
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