Hello Jeff,
you don't need any special equipment for xvidcap. You might want to try current 
svn trunk, though, and do the usual "./autogen.sh && debian/rules binary"

As for the platforms I've been talking about: Well, since the effect seemed 
different on various platforms we've tested some:
AMD32 (Athlon XP) : works like a charm
P4 3GHz (HT enabled with SMP kernel) : chrashes every so often (~1-2 times out 
of ten)
AMD64 (Multicore CPU with SMP kernel : crashes (next to) every time

My guess is that this is somehow related to higher CPU speeds and/or more 
fine-grained timings increasing the probability of this happening.
Also, LinuxThreads or non-SMP seem to avoid this problem. I've read of a 
somewhat similar case (ages ago, though) where the error is due to individual 
threads !on different CPUs! getting a mutex at the same time. Dunno if this is 
the same here, too, though.
Thanks for your help,

Karl.

-- 
get libpthread assertion on multicore CPU
https://launchpad.net/bugs/60708

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