Decklink HD Extreme (PCIe) slows down FCP
We have 8 seats of FCP, using a variety of AJA kona and decklink cards, on a sanmp San, and editing DV PAL and XDCAM 30mbit/s PAL timelines. FCP 5.1.4 on os X 10.4.10.
Only our new Decklink HD Extreme (PCIe) system (G5 Dual 2.3GHz, PCIe, 4.5GB RAM) slows down FCP in this way: When the external video is on, as you edit it gradually slows down – scrubbing slows down, delay before playing grows, and even stepping through a timeline frame by frame – any cursor changes on the timeline slows down.
However – open the same quicktime source file while FCP is still open, and in quicktime the file scrubs very fast. So – the problem is not with the SAN or the OS, it’s FCP or the Capture card. And since we have many other similar FCP systems on the same SAN with the same media and FCP version, it seems the culprit is the Decklink HD Extreme.
After about two hours’ editing, it becomes unusably slow. We found the one thing that solves it is to disable and re-enable external video (Apple-F12). So now we resorted to doing this about every 20 minutes.
We are still on Decklink software 6.0, and have downloaded 6.1. We have not installed it yet – would this help? Any ideas? How do we stop the decklink card from slowing down the system?
It is an HD card running in SD resolution, but I have tried setting the HD up and down conversions to several combinations without luck. For now they are off. And I have a Decklink Extreme SD (PCI-X) card that does not exhibit the same problem.