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That's a pretty hard question to answer; depending on modes HEVC & VP9 could be harder or easier than AVC. It also depends on how you measure complexity. Memory usage? Silicon area? CPU load?
For HW the silicon area is higher than AVC due to the usage of larger blocks. In terms of decode time in SW, HEVC seems to be on average ~2x that of AVC, and I suspect VP9 is similar or slightly worse.
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