[x264-devel] Threaded slicetype patch

[Mike Kazmier]

Well - it clearly took a lot longer to get it all right - but hey, I learned a lot in the process.  Attached is the threaded slice type patch against r1088.  This gives identical resutls for threads==1 and identical slicetype decisions for threads>1 with/without lookahead.  You do have some slight encoding differences due to the threading, but overall I believe this patch is ready for inclusion in the mainline x264.  To use it, simply add the option --lookahead <int> - I have found best results with lookahead >= 1.5*threads.  

Enjoy ;)

DaKaZ
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