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Decklink driver 5.2 drop frames
Hi all,
I am using a Decklink HD Pro capture card with a RAID0 array to capture 1080i 30 fps. I am using 8 bits. When I ran the Decklink speed test, I get about 150 MB/s for the write and 40 fps for the mode I described. My problem is that when I capture longer than 30 seconds, the decklink card will drop about 50% of the frames. I think the problem is the raid drive can’t catch up with the capture, but Speed test tells me otherwise. Has anyone else seen this problem?
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4 Replies
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Hi,
150MB/sec for 1080/60 is nowhere near adequate. Our speed disk test is there as a guide, not an absolute. You need to have some overhead – around 20%. for any RAID setup. For 1080/60 a RAID running around 200-220MB/sec would be a good solution.
Cheers,
Regards,
Matt
Blackmagic Design -
Matt,
Thanks for the reply. I forgot (not purposely) to mention that using the 4.4b10 drivers the system has no problem capturing at all. I know a lot has changed since 4.4 days, but do you know any change that might have caused this.
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To be honest 4.4 is over a year ago, so much has changed since then that i would have no idea why 4.4 worked and 5.2.2 doesn’t. There has been so many improvements in regards to features and stability since then, i would not recommend running 4.4. There has been a lot of OS changes since then to. That would be the first thing i would look at.
Regards,
Matt
Blackmagic Design -
Make sure you do not have more adio channels than you need. If you are on that critical level removing the audio might help.
-Kaspar
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