-
uncompressed 4:2:2 1080psf 23.98 freezes during capture
Hello everyone,
I am capturing uncompressed 1080psf 23.98 fps from an S-Two Digital Film Recorder with FCP 5.0 and a dual 2.5 gig G5, 8 gigs of ram and a Decklink Dual link HD Pro card in the PCI-X 100mhz slot. The S-Two DFR records 4:4:4 RGB as .dpx files and can also output dual link, 4:2:2 HD, analog RGB, and composite video. I use the FCP 1080p 23.98 10 or 8 bit easy setup and turn off every function that may cause FCP to drop frames or hangup. I can’t seem to get captures over 30 seconds that don’t drop frames or freeze the image for a several seconds before capturing normaly using “Clip, Capture Now, or Batch Capture”. Also everything that I do capture, either uncompressed or downconverted during capture needs to be rendered before it can be played back in real time.
I would appreciate any ideas as we have been experimenting with the audio/video settings, user preferences, and system settings.
Still Chipping away at it.
Cheers, Robert -
5 Replies
-
Usually indicates drive problems. What kind of array are you using?
Kevin Monahan
Take My FCP Master’s Seminar!
fcpworld.com -
Hi Kevin and thanks for the reply,
The array is an S-Two DMAG: basically six seagate 35 gig hard drives operating at 15k rpm via fibre channel Mac card. Mac OS is Tiger by the way.
Robert -
[Robert Douglas] “The array is an S-Two DMAG: basically six seagate 35 gig hard drives operating at 15k rpm via fibre channel Mac card. Mac OS is Tiger by the way.”
Just barely enough speed or platters for 1080| 24ps
with this type of content you will need a min of 200mgs a sec data transfer. this set up can only do about 130 or so ( I think I remember that)
what does your disk test tell you the write speed is.
Gary Adcock
Studio37
HD and Film Consultation
Chicago, IL USA -
Hi Gary,
I ran the Decklink disk speed test on our raid and the results were extremely poor. I then erased the raid and restripped it as Mac OS Journaled with 256k blocks, after running the disk speed test again it reads at 360 mbps and writes at 283 mbps. Input performance is noticeably improved, however capture still freezes randomly. I also noticed that if I run the speed test more than once on the newly striped raid the results can differ significantly.
Still Testing.
Cheers,
Robert -
I wanted to follow up with the results. We were having issues with the disk array. I did relinstall Tiger, reinstalled FCP, and Decklink. Properly stripped and configed the raid and voila, no more freezes on capture. Thanks for the ideas,
Robert Douglas
Reply to this Discussion! Login or Sign Up