I've been trying to debug the segmentation fault that happens on 4xm-2 for the 
past 2 evenings but I haven't had much luck as it only seems to occur at 
optimization level -O3 -- the default for Sun CC -- and higher (we currently 
use -O5). gdb and Sun's dbx are more or less useless at that level as most 
local variables have been "optimized away".

Currently it dies after calling malloc() somewhere in avpicture_layout() -- and 
it looks like something is NULL.

I guess the best thing to do in that case is printf()-style debugging?

-- Sean
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