Kona LHe – Is the data rate always different?

[Bob Zelin]

What is the real reason for your question? Are you trying to determine what
drives to use with your system to 10 bit uncompressed video ?

Bob Zelin

[Jeremy Garchow]

What are the frame rates for each type of capture?

[Ben Cheng]

Hi Bob & Jeremy,

This particular system is quite unstable for a while, dropping frames regularly. Even when the Huge U320R-600 is less than 10% full.

I have been troubleshooting this system and we replaced the G5 motherboard and CPU before.

Some of the actions taken:
– Replaced faulty CPU = No more loud blowing fans
– Swapped a new brand internal SATA disk, with a fresh install of Mac OS X
– Re-installed Mac OS X 2 weeks ago
– Huge U320R-600 passed Internal Disk Speed Test

The customer noticed the data rate is not fixed and the no. will range from 23MB/s to 27MB/s.
On the other system with Blackmagic, this does not happen.
I remembered on other systems with Kona cards, the data rate does not change too.

Both Kona and Blackmagic systems are working on PAL Uncompressed 10bit only.

Cheers,
Ben

[Bob Zelin]

Ben –
your dropped frames are due to a drive issue. Run AJA Kona System Test on the HUGE array, and report back your results, in read and write speeds in mb/sec. This will help determine what is going on. I am not there, and for all I know, you client is trying to record on the internal hard drive of the MAC.

Bob Zelin

[Ben Cheng]

Hi Bob,

I downgraded the Kona driver from 3.3 to 3.0, as the FCP is 5.0.4.
So far the data rate is more constant, around 26.7MB/s.

A weird issue that has been bugging this system is the mouse cursor disappear, during editing or no user or system activity after a while, e.g 30min.

We swapped the boot disks, different versions of Mac OS X and replaced the motherboard and CPU before.

Next I’m going to swap the ram and replace with new ones.

Cheers
Ben Cheng