![]() With MainConcept, I used 27 for the P/Q value, which controls the quality/encoding time trade-off. Though Placebo took about 73 percent longer than Slower, the quality was only 2.44 percent higher, so we didn’t leave a lot of quality on the table using Slower. To put this in perspective, in tests performed for a how-to article on encoding HEVC in the Streaming Media Sourcebook, I ran some comparison encodes between the Slower preset and Placebo, the highest-quality preset. ![]() To test x265, I used the command script used by MulticoreWare, which used the Slower x265 preset. I encoded all three resolutions of the New Test clip, which is 1 minute, 36 seconds in length, with X.265, MainConcept, and VP9. To test encoding time, I encoded all clips on my 12/24-core Z800 workstation configured with two 3.33 GHz X5680 Intel Xeon CPUs and Windows 7 running on 24GB of RAM. So let’s move to the next factor, encoding time. ![]() So despite the results shown in Table 1, it appears that if and when MainConcept implements dual-pass encoding, overall quality should be very close to x265.
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