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4K XAVC playback dropped frames and stutter

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Hi

 

We have several computers running various setups that has problems playing back 4K XAVC-I from the FS7 camera.

 

While actual playback itself is rather fine, and CPU usage hovers around 25% even with grading applied, the start and stop of the playback induced lag, dropped frames, stutter, and 1-2 second hangs. CPU usage spikes to 100% during these events.

 

I had the problem on an i7 3930K, 64gb ram, ATI R9 290x and thought well, maybe its a bad Windows install and weak chip, so i upgraded to current spec:

 

i7 5930K OC`d to 4,05ghz

64gb DDR4 2600mhz

Nvidia GTX 980 Ti at stock speed

Windows 10 100% fresh install with no other programs other than Adobe and fresh drivers installed from the web.

RAID 0 with 4x WD Black 4TB disks from external PCI-E RAID controller.

OS installed on SSD#1

Programs installed on SSD#2

Latest Adobe CC installed

Latest PPro CC installed

 

This computer cuts 4K like butter, but it hangs and lags on pressing space or mouse clicking playback to start.

 

What could be the issue?


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