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Topic: DCI Bit Rate Increase?
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 06-22-2012 10:04 AM
Currently, DCI bitrate is limited to 250MBit/s. This is the same for 2k/2D, 2k/3D, and 4k/2D. The Wavelet compression scales especially well with higher resolution, so 4k does not really need increased bitrates. Also, there is still not a single feature that used up the max bandwith so far, not even high-end 3D features. Most CPLs max out around 130-160MBit/s. So there is quite some headroom left.
Different thing for HFR - High Frame Rate features. The frame rate at least doubles over 2k/3D/24fps, so they are going for higher datarates with HFR. Current HFR capable media blocks quote 400-500MBit/s throughput. Qube even boasts 1000MBit/s storage throughput (two dual-IMB).
So yes, the DCI specs will change/adopt with HFR. But for backwards compatility, 2D/2k, 2D/4k and 3D/2k will still stay with the 250MBit/s limit. Not every DCI system in the wild will or can be upgraded to HFR, they will stick with the 250MBit/s limit and would crash on CPLs with significantly higher datarates.
- Carsten
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