Need some help trouble shooting SIGSEV

I'm working on this issue 

https://bugzilla.gnome.org/show_bug.cgi?id=753323


and all of my commits so far can be found here:

https://github.com/GrokImageCompression/gst-plugins-bad/commits/753323-mpegts-j2k

I can launch the following working pipeline :

gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc ! mpegtsmux ! tsdemux ! jpeg2000parse ! openjpegdec ! videoconvert ! ximagesink

while this pipeline gives me a SIGSEV

gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc ! jpeg2000parse ! mpegtsmux ! tsdemux ! jpeg2000parse ! openjpegdec ! videoconvert ! ximagesink

i.e. adding a jpeg2000parse element after openjpegenc causes SIGSEV.

Any advice or help in understanding and tracking down this crash would be really

appreciated.

Thanks,

Aaron

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[Nicolas Dufresne-5]

Le mercredi 21 juin 2017 à 22:00 -0400, Aaron Boxer a écrit :

> I can launch the following working pipeline :
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc ! mpegtsmux
> ! tsdemux ! jpeg2000parse ! openjpegdec ! videoconvert ! ximagesink
>
> while this pipeline gives me a SIGSEV
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc !
> jpeg2000parse ! mpegtsmux ! tsdemux ! jpeg2000parse ! openjpegdec !
> videoconvert ! ximagesink
>
> i.e. adding a jpeg2000parse element after openjpegenc causes SIGSEV.
>
>
> Any advice or help in understanding and tracking down this crash
> would be really
> appreciated.

Run in GDB, and look at the backtrace.

Nicolas
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On Jun 22, 2017 9:16 AM, "Nicolas Dufresne" <[hidden email]> wrote:

Le mercredi 21 juin 2017 à 22:00 -0400, Aaron Boxer a écrit :
> I can launch the following working pipeline :
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc ! mpegtsmux
> ! tsdemux ! jpeg2000parse ! openjpegdec ! videoconvert ! ximagesink
>
> while this pipeline gives me a SIGSEV
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc !
> jpeg2000parse ! mpegtsmux ! tsdemux ! jpeg2000parse ! openjpegdec !
> videoconvert ! ximagesink
>
> i.e. adding a jpeg2000parse element after openjpegenc causes SIGSEV.
>
>
> Any advice or help in understanding and tracking down this crash
> would be really
> appreciated.

Run in GDB, and look at the backtrace.

Thanks!

Nicolas
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_______________________________________________
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On Thu, Jun 22, 2017 at 9:16 AM, Nicolas Dufresne <[hidden email]> wrote:

Le mercredi 21 juin 2017 à 22:00 -0400, Aaron Boxer a écrit :
> I can launch the following working pipeline :
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc ! mpegtsmux
> ! tsdemux ! jpeg2000parse ! openjpegdec ! videoconvert ! ximagesink
>
> while this pipeline gives me a SIGSEV
>
> gst-launch-1.0 -v videotestsrc pattern=ball ! openjpegenc !
> jpeg2000parse ! mpegtsmux ! tsdemux ! jpeg2000parse ! openjpegdec !
> videoconvert ! ximagesink
>
> i.e. adding a jpeg2000parse element after openjpegenc causes SIGSEV.
>
>
> Any advice or help in understanding and tracking down this crash
> would be really
> appreciated.

Run in GDB, and look at the backtrace.

Thanks, fixed the problem - trying to handle a null string from caps.

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