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Random but persistent flicker – IoHD
Just wrapped up a nice job on some TVC’s, uncompressed SD and all was going well. Switched to to a not quite as glamourous but no less important training video DV job and began having trouble with preview /output.
It’s a random but persistent occasional frame flicker on my monitor/output from IoHD…have checked component, Svideo and composite outputs and it’s the same – checked all cables, rebooted, powercylced, checked project/sequence/aja settings, changed monitors… Reverted to the uncompressed job – same problem there now.
I’m a bit flummoxed now – anyone got any ideas? I know I can revert to firewire for this job (going to have to when the client is here tomorrow) but I’d like to crack this before I’m up against it again.
2 x 3Ghz Quad Core Xeon
8 Gig Ram
FCS 2
AJA IoHDTim
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Man cannot discover new oceans until he has the courage to lose sight of the shore. -
13 Replies
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What do you mean by frame flicker? Are you referenced/genlocked? What other gear is hooked up to your machine and what kind of machine do you have?
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Dont worry your not alone, I have had this issue since day 1, I thought i was going crazy until I saw your post. I have only seen this issue on passthrough or holding still frames in FC, fortunately this doesn’t happen during continuous playback through FinalCut, or i would return this thing in a heartbeat.
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[Ken Botelho] ” I have only seen this issue on passthrough or holding still frames in FC”
Are you sure that’s not interlace twitter?
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Thanks for the replies…this is definitely not interlace twitter – it’s flashing and flickering sometimes at the top of the picture, then the bottom, then accross the whole frame.I’m getting it not only on passthrough of holding frames, but during playback. It’s also a brand new problem, I’ve been using this IoHD since last November and not had this issue. It looks like you would expect output with a dodgy cable to look – if it’s not cable related I’m guessing there is something up inside my IoHD?
At the moment there is nothing else at all connected to my MacPro other than the Aja IoHD. Recently there has been a hired in Digibeta deck, normally there is a Sony HVR M25 with an Addenda Lanc-RS422 adapter.
UPDATE! After writing the above I realised one additional connection change I hadn’t tried yet -so I plugged the new IoHD firewire cable into my second FWbus on the MacPro….guess what…the problem has gone. Praise be.
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Man cannot discover new oceans until he has the courage to lose sight of the shore. -
Not “twitter” the entire screen flashes a frame of black from time to time….. Strange, I have the IoHd on a separate bus too (sonnet card). I since its intermittent and random its difficult to reproduce at my will.
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[Tim Kirby] “UPDATE! After writing the above I realised one additional connection change I hadn’t tried yet -so I plugged the new IoHD firewire cable into my second FWbus on the MacPro….guess what…the problem has gone.”
I was going to suggest putting your ioHD on the Mac bus and your drives on the Sonnet card.
Nice one.
Jeremy
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Ken, take Tim’s advice.
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[Jeremy Garchow] “Q”
Thanks Jeremy, I will leave it connected to the logic board bus for some time and let everyone know if i still have problems. Fingers crossed….
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I too am having a flicker with playback with the ioHD. However, I can replicate the problem when it happens. It ALWAYS happens with a lower third super (made with LiveType.) In this last project the segment had six lower thirds in one five-minute segment.
The host names appears at the first and the last of the segment (the same file) and is steady. The other two, also shown twice in the segment using the same file causes the picture behind the super to flicker vertically. It will ALWAYS flicker on these two files.
The lower thirds are made using the same “master template” as the other dozen or so lower thirds in the program. They are all steady.
Playing the program on the computer does not give any hint there is a problem. I see it when it passes through the ioHD into the HDTV studio switcher. I see it on ioHO control monitor. The program is produced in 1920 X 1080i.
This problem occurs somewhere in every program I have produced using the ioHD. We have switched the ioHD’s with a brand new unit. It is the same result.
It does not matter if the clip the lower third is over was up converted from 1440 X 1080i or a native 1920 1080i.
I’m using Apple ProRes 422 1920 X 10801 (HQ).
I have exported the program out to a QuickTime movie and played it back. Same result in the same place! I have played it back from the original sequence time line (rendered) same result.
I tried switching the FW from the back of the MAC Pro to the front as suggested. Problem still there, and occurs with same two files, in the same place. I have even run the program on a different computer use a different ioHD!
The program and running on our Apple SANS network.
JR
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I don’t use LiveType so it’s hard for me to judge, but have you tired rendering out of LiveType first then bringing in that movie?
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