I made only 1 test encode, so i dont know if it's a general behaviour or not, but the resulting video is identical to the one made with the older build from may, but it took nearly twice the time to finish. After the first keyframe is finished, it waits several minutes seemingly doing nothing (using 25% cpu on a 4 core haswell i5) until it starts to encode the inter-frames. Maybe i remember incorrectly, but i dont think the older build did that long wait. After that it seems to work ok, using 96-98% cpu at times. I set the number of threads to 4.
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