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Turbo first pass of 2 pass still runs audio processing?

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Hi,
2500k @ 4.5 ghz
An example, when doing 540p encodes with HE-AAC FDK, any x264 preset faster than fast ends up not using 100% cpu, due to the HE-AAC thread being maxed out. So the FPS doesn't increase from fast to faster or very fast/ultrafast. Medium, slow, and slower do show a reduction in speed because the cpu cores are 100% utilized.

When doing a 2 pass encode and using AAC FDK, the first pass uses something like very fast or ultra fast to analize, which means that the speed isn't maxing out, the cores not at 100%.

Why would the first pass process audio, if this data is unused???

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RandomEngy wrote Jan 14, 2014 at 3:14 AM

Don't know. Does HandBrake display the same behavior?