March 24, 2017 at 5:35PM, Edited March 24, 5:36PM

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Data rate of the uncompressed HDMI signal on the A7S II?

Does anyone know the data rate of the uncompressed HDMI signal that is supposed to come out of the A7S Mk. II? I'm looking to calculate the best codec and data rate to record on an external recorder. I can't seem to find this information officially listed anywhere. Any help appreciated, thanks!

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It looks like, according to Atomos, it gets up to 4:2:2 8bit 4k (vs.10bit internal 4:2:0 in 4k). Hope that helps!

Source: https://www.atomos.com/cameras/sony-a7sii

March 27, 2017 at 9:45PM

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Daniel Baas
Freelance Editor/Cinematographer
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If you have access to an external recorder then I would shoot your own tests, and see what rate seems like the best compromise to you. ( if you don't have access, you might try hitting up a camera rental or camera store when things are quiet and see if they will let you test in the store )

Most external recorders use ProRes at bit-rates that go from 220 Mbps all the way up to 1,800 Mbps, so you can try a variety of settings and see how low you can go and still obtain a great image. ( you also might want to test in low-light to see if noise has any impact on the best data-rate to use )

March 28, 2017 at 9:52PM, Edited March 28, 9:52PM

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Guy McLoughlin
Video Producer
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