HI Lonny

the first thing you do in gdb when you hit the problem is a stack  
trace: bt
It will tell you the call chain. Your problem happens in strol_l which  
looks like a standard C lib function. As it should not contain bugs,  
it was probably called with an invalid pointer. You should find out,  
how is this. See the original source of your ffmpegthumbnailer. you  
can set a break point a little before and check all variables (using  
print variable name)

so. this might get you started. :)

good luck, though,
matthias

On 19.08.2008, at 17:01, Lonny Selinger wrote:

>> Program received signal EXC_BAD_ACCESS, Could not access memory.
>> Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
>> 0x969721e5 in strtol_l ()
>> (gdb) list
>> 1
>> 2       /* png.c - location for general purpose libpng functions
>> 3        *
>> 4        * Last changed in libpng 1.2.21 October 4, 2007
>> 5        * For conditions of distribution and use, see copyright
>> notice in png.h
>> 6        * Copyright (c) 1998-2007 Glenn Randers-Pehrson
>> 7        * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
>> 8        * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat,
>> Group 42, Inc.)
>> 9        */
>> 10
>
> I dont suppose anyone else would be willing to try to build this?  
> lol ... I noticed the list pointing to png.c and the fact that it  
> was a slightly dated version so I removed libpng(3) and shlibs  
> related. Then I compiled the latest zlib and png and managed to get  
> the same error in the same spot but pointing to the new version:
>  -h     : display this help

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