Analyzing takes quite long on UHD HEVC videos

[rlaphoenix]

Some way to speed up analyzing UHD HEVC videos would be nice. It's likely long simply due to the amount of time needed to decode and run scene detection on every frame.

On my end, it's taking 5-6 minutes per 22 minutes of content. That doesn't seem too bad but when you need to run this on 100s of files, that adds up quickly.