View Full Version : VT5 picture flickering

04-03-2008, 06:40 PM
Hello guys!!!

Its me again! And with a new problem...

I got my copy of VT5 just this morning and was trying a few things out on my Vista based workstation (Dual Xeons, 2GB, 256MB VGA, 1.5TB RAID...). I'm keying a few green screen clips and using the LiveMatte and LiveSet but I keep getting this funny flicker every few seconds or so. Its like flickering the next available set...for example, if I were to chose a set that would accomodate a long shot and were to key it over my source it would flicker the closeup LiveSet. But it is very brief and happens very regularly. What could be the prob?

04-03-2008, 07:02 PM
Initially, try disabling your Preview out in Prefs ....

04-04-2008, 07:53 AM
Also check the PCI bus latency in your CMOS setup. I'd set it to 128.

04-04-2008, 08:26 AM
That was going to be my next suggestion (quoting you, of course Jeff.) :)

04-05-2008, 06:52 AM
Tried all those things. Still flickering...usually happens when I enable LiveSet/LiveMatte.

04-06-2008, 05:58 PM
How fast is your front side bus?

04-08-2008, 11:28 AM
The card is on the PCI-X slot so it should be around 133MHz?

04-08-2008, 11:44 AM
Not quite the same thing. If you have the "VT Pro" card, in a PCI-X slot it would pull that bus down to 66mHz, I think, but that's a different factor than front side bus, which may be (for example) either 533mHz or 800. You can generally tell from the info shown on first booting, or by checking the BIOS info.

04-08-2008, 12:13 PM
I'm think that a FSB of 533MHz might be a problem with live sets. I don't have such a machine to test on right now.

04-08-2008, 04:31 PM
You talking FSB on the CPU or on the slot? I have dual Xeons running at 3.4GHz with 2GB DDR memory...Five 146GB UltraSCSI 320 in a RAID 0...Vista Ultimate...and yes, a GeForce 6600 LE with 256MBytes of RAM...

04-08-2008, 04:50 PM
You seem to be confusing 'bus speed' (the clock rate for the PCI, PCI-E, etc., systems), 'front side bus speed' (FSB) - between the CPU and motherboard, and the cpu's own speed.

edit - check the discussion at this link, which explains the relationship of these three: http://en.wikipedia.org/wiki/Front_side_bus

04-09-2008, 01:00 AM
So which speed are we talking abt here?

04-09-2008, 06:04 AM
All are relevant, of course - but Jeff has been referring to FSB, as have I. LiveSet seems to demand 800mHz or better. That said, I've seen 800mHz systems that still choke on LiveSet switching (despite the PCI latency adjustment Jeff mentioned) so there may be more to it than that as well.