Hi,
this set adds slice threading infrastructure to lavfi (mostly stolen from lavc)
and then applies it in yadif.

The thread count is currently determined per-graph, since I don't think it makes
much sense to use per-filter thread counts with slice threading. This will
probably need to change if/when someone adds frame threading and I suppose
combining the two will be all kinds of fun. Patches welcome.

Right now it's not possible to set thread count from avconv, since it has no
proper support for per-graph options. So autodetection is always used.
It is however possible to disable threading for specific filters with -vf
filter=thread_type=0

Please comment.

-- 
Anton Khirnov

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