It is slow to convert side-by-side 3D video to multiview HEVC

I'm using the "Converting side-by-side 3D video to multiview HEVC and spatial video" sample code on iOS. It takes about 8 seconds to convert a 6-second video. At this rate, a 1-hour video would take 1.3 hours to convert.

How can I speed up the conversion?

BTW, are there solutions to convert side-by-side 3D video to spatial video for Windows?

It is slow to convert side-by-side 3D video to multiview HEVC
 
 
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