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I'm looking for ballpark figures for what 4K movies from iTunes use in terms of network bandwidth.

Is this documented or something that's a known range?

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Apple recommends a minimum speed of 25 Mbps for 4K streaming

Find and watch movies with 4K, HDR, or Dolby Vision - Apple Support

A nice tool to estimate what bandwidth is needed for various video formats is the Black Magic Disk Speed Test app: https://itunes.apple.com/us/app/blackmagic-disk-speed-test/id425264550?mt=12

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