Flash XDR Maximum Data Rate Recording Capability at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > External Video Recording Solutions > Convergent Design Odyssey

Convergent Design Odyssey
...and other Convergent Design products.


Reply
 
Thread Tools Search this Thread
Old April 10th, 2010, 08:47 PM   #1
Trustee
 
Join Date: Sep 2006
Location: Montreal, Quebec, Canada
Posts: 1,138
Flash XDR Maximum Data Rate Recording Capability

Hi Dan or Mike or Tommy:
I have a general tech question regarding the Flash XDR which is not related to beta testing results. What is the maximum recording capability possible using the fastest CF Card media approved with the XDR ? In other words, is it possible to record on the Flash XDR with a data rate higher than 280 Mbps in I-Frame mode ?
Mark Job is offline   Reply With Quote
Old April 10th, 2010, 09:27 PM   #2
Inner Circle
 
Join Date: Dec 2002
Location: Augusta Georgia
Posts: 5,413
Dear Mark,

We performed tests to determine the highest bit-rate we can support.

Then we back off a little to ensure reliability.

Please do not expect any serious advances in bit-rates.
__________________
Dan Keaton
Augusta Georgia
Dan Keaton is offline   Reply With Quote
Old April 10th, 2010, 11:01 PM   #3
Trustee
 
Join Date: Sep 2006
Location: Montreal, Quebec, Canada
Posts: 1,138
No Serious Advances in Bit Rate Recording on the XDR ?

Hi Dan:
Would this limitation be hardware based or CF Card Media based ?
Mark Job is offline   Reply With Quote
Old April 11th, 2010, 01:58 AM   #4
Major Player
 
Join Date: Jun 2009
Location: Vientiane (Lao PDR)
Posts: 349
I guess that the higher the data rate you set, the easier for the XDR to process the signal, but more performance needed to write it.
Lower data rate means a bigger effort to properly compress the signal but less writing performance needed.
Personally I don't see the need of higher data rate.
The Sheer 8b Uncompress files are only some 10% bigger than the XDR/NANO files.
That means that we can consider the 280Mbps files virtually 8b Uncompress.
rafael
Rafael Amador is offline   Reply With Quote
Old April 11th, 2010, 01:28 PM   #5
Trustee
 
Join Date: Sep 2006
Location: Montreal, Quebec, Canada
Posts: 1,138
Higher Data Rate Recording on the Flash XDR

Quote:
Originally Posted by Rafael Amador View Post
I guess that the higher the data rate you set, the easier for the XDR to process the signal, but more performance needed to write it.
Lower data rate means a bigger effort to properly compress the signal but less writing performance needed.
Personally I don't see the need of higher data rate.
The Sheer 8b Uncompress files are only some 10% bigger than the XDR/NANO files.
That means that we can consider the 280Mbps files virtually 8b Uncompress.
rafael
Hi Rafael:
I agree with you that uncompressed is *not required for television production, but is very desirable for digital cinema origination for later output to film. The less compression in that case would be the better.
Mark Job is offline   Reply With Quote
Old April 11th, 2010, 01:36 PM   #6
Trustee
 
Join Date: Sep 2006
Location: Montreal, Quebec, Canada
Posts: 1,138
2nd Pub Beta .MOV QT Files @ 220 Mbps I-Frame Recording

Hi Dan:
Very disappointing results were obtained from the second public XDR beta when I attempted Quicktime .MOV file recording using I-Frame codec scheme instead of Long GOP 180 Mbps. When recording files for QT .MOV using the I-Frame recording scheme @ 220 Mbps the resulting playback yielded.....

A) No Sound ! (I'm testing this further to be sure)
B) Glitchy, unsteady video, which breaks up and turns green !
C) Audio popping, screeching, and clicking !

I can confirm I had good audio during recording with proper VU meter modulation indication within proper limits for good 48 KHz 24 bit audio recording. I will re-test these results once again to confirm wether I can re-produce these anomalies. * CF Card playback via USB 2.0 reader in my iMAC yielded excellent playback picture quality but no audio signal. (Actually a loud hiss could be heard)

** Obstreperous Chris the Rex, I just realized I have posted this in the wrong thread, so if you see the cross post in the other thread, then please delete THIS ONE HERE. Thanks MJ.

Last edited by Mark Job; April 11th, 2010 at 06:15 PM.
Mark Job is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > External Video Recording Solutions > Convergent Design Odyssey

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 08:13 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network