David Coleman
1
COW Coin
Forum Replies Created
-
I work at Mayo Clinic where I shoot around all kinds of medical equipment: MRI, CT scanners, Operating rooms and many different kinds of procedures. It is an enormously crowded RF environment, but I haven’t had any problems with it corrupting my P2 data. I shoot with hvx-200 and hpx-2000 cameras.
-
Everything works fine for me. There are a few settings in the camera menus that affect the wireless. For instance, there is one for one channel/ two channel. I can’t recall for sure, but there may be an input level you can adjust. I know that if your frequency setting isn’t spot on you can get some noisy audio and it will be low.
-
Is your time code drop frame or non-drop?
-
Follow-up: I installed a PCIe Firewire 800 card and connected my FW drive and PCD20 card reader to it. Now the IoHD is on a separate bus. After a few tests I am confident that my problem was overloading the Mac’s FW800 bus. I hope this helps somebody else.
David
-
Yes on the drivers. I see what you mean about having the reader on its own bus, but I’m not sure I agree with your conclusion for three reasons.
1. FW800 is moving data from the card through the computer and back to the hard drive even though it is daisy chained. It isn’t like it has to do it in real time, even though it could, since data rates are <100MB/S. It really shouldn't be an issue. If it is, why do they put two ports on the drive to begin with?
2. I haven't had problems with this hookup until now and the only different variables are the codec--which is smaller than DVCProHD--and the IoHD.
3.It seems to me that the Io is an additional, bidirectional stream that introduces further complexity. I know it polls the FW bus even when it isn't actively carrying video info back and forth. You and others on this site have mentioned that it isn't good to combine it on the same bus with a FW drive and I am sure that is based on experience.
Make sense?
-
Thanks, Jeremy for all your help. I’ve concluded that it isn’t the AVCIntra codec that caused the problems, but copying the files to the FW800 drive while the AJA IoHD was connected to the rear FW800 port.
I’ve salvaged a lot of the footage and interviews and I’ll be doing things differently. Specifically, I’ll be getting a PCIe FW card, though I’d like to get the PCD35 card reader while I’m at it.
Thanks again.
-
Yes to all your questions: AVC-I 50, 720p 59.94
David
-
-
Yeah, it is a short clip. Here’s a link to the mxf file. I can’t upload the contents folder because dropbox and yousendit only allow files to be sent. No access to the original cards.
https://dl.getdropbox.com/u/224538/0006OO/CONTENTS/VIDEO/0006OO.MXF
-
Okay, so let me get this straight. You have a PCD20, a fw800 drive, and an IOHD on the same bus? how did you have enough ports for that? 😀
We mock what we do not understand 😀
There’s a port on the front and on the back. I may not have explained that the IOHD is new as is the computer, so it explains why I haven’t run into this before.
QuickTime has the same problem. I have one I can send you that is about 34MB. How do I get it to you?