Multithreaded encoder, late sync loopfilter
Second shot at this... Sync with loopfilter thread as late as possible, usually just at the beginning of next frame encoding. This returns control to application faster and allows a better multicore scaling. When PSNR packets are generated the final filtered frame is needed imediatly so we cannot delay the sync. Same has to be done when internal frame is previewed. Change-Id: I64e110c8b224dd967faefffd9c93dd8dbad4a5b5
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