[Mlt-devel] Seg Fault in transition_composite.c

[Torsten S. <spi...@hb...>]

Hello,

I'm getting seg faults in the composite_line_yuv function in
transition_composite.c, a backtrace is attached to the mail.

The code where this happens is a custom filter I wrote that synchronizes
a filter on incoming udp messages. I put the code at=20
http://fett.ethz.ch/~spindler/pivisaUtil.tar.bz2
and
http://fett.ethz.ch/~spindler/obscure.tar.bz2

The seg fault only occurs when I use the region filter. With the obscure
filter no problem appears. Here's the line in obscure.c where I decide
on compile time what filter to use:

#ifdef _USEREGIONFILTER
        filter =3D mlt_factory_filter( "region", NULL );
#elif _USEOBSCUREFILTER
        filter =3D mlt_factory_filter( "obscure", NULL );
#endif
        mlt_properties filterProps =3D mlt_filter_properties( filter );
#ifdef _USEREGIONFILTER
        mlt_properties_set( filterProps, "filter[0]", "obscure");
        mlt_properties_set( filterProps, "filter[1]", "invert");
#endif

I change the filters behaviour based on the message I parse with this
line in both cases:
        mlt_properties_set( props, REGIONPROP, buffer );

REGIONPROP is one of the following two:

#ifdef _USEREGIONFILTER
#define REGIONPROP "composite.geometry"
#endif

#ifdef _USEOBSCUREFILTER
#define REGIONPROP "start"
#endif

I'm not sure if I'm using the region filter wrong or if there's a bug
within mlt. Any help on how to debug this is appreciated!

Bye,
Torsten