Cineform issues with realtime capture on 7d - NeoHD v3 at DVinfo.net

Go Back   DV Info Net > Cross-Platform Post Production Solutions > CineForm Software Showcase

CineForm Software Showcase
Cross platform digital intermediates for independent filmmakers.


Reply
 
Thread Tools Search this Thread
Old March 21st, 2010, 07:54 AM   #1
Major Player
 
Join Date: Jun 2007
Location: Sydney Australia
Posts: 394
Cineform issues with realtime capture on 7d - NeoHD v3

OK. Cineform records fine with my HV20 and does the pulldown in realtime. The settings used are Progressive AND pulldown. 29.97 PsF comes up in the BM window.
I have been trying to get it to work with the 7D over the past week - but have had problems.
It seems that it loses the pulldown cadence on 24P in the middle of a capture. I used the .AVI option for capture.
I am pretty sure that its the cadence thats lost, since the first few frames have a similar issue while CF tries to detect the right cadence.
Has anyone else seen a problem recording direct from the 7D ?
Here are the screen grabs.
Attached Thumbnails
Cineform issues with realtime capture on 7d - NeoHD v3-screen-shot-2010-03-21-3.47.13-pm.png  
Attached Images
File Type: png Screen shot 2010-03-21 at 7.59.56 PM.png (1.88 MB, 138 views)
__________________
mishra.tv Productions
A Sydney-based group for dance movement-based video and film productions.
Anmol Mishra is offline   Reply With Quote
Old March 21st, 2010, 11:10 AM   #2
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
What class of PC are you capturing to? What CPU load do you get while capturing? The compute load will likely be higher for the 7D vs HV20, so if your PC is burdened it can drop a frame, throwing the pulldown off.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman is offline   Reply With Quote
Old March 21st, 2010, 11:47 PM   #3
Major Player
 
Join Date: Jun 2007
Location: Sydney Australia
Posts: 394
Hi David. I am using a 2.4GHz C2D. I am using a version of XP that operates from RAM - so no writes to boot disk. Unnecessary processes disabled.
Now I was using Film Scan. If your premise is correct, a High or a medium would work.

Also, what happens if I record without removing pulldown ? Is there a smaller chance of lost frames ?
Also, is there any loss if I record without removing pulldown and then remove pulldown later with HDLink ?
__________________
mishra.tv Productions
A Sydney-based group for dance movement-based video and film productions.
Anmol Mishra is offline   Reply With Quote
Old March 21st, 2010, 11:48 PM   #4
Major Player
 
Join Date: Jun 2007
Location: Sydney Australia
Posts: 394
Also, you stated that the compute load is higher for 7D vs HV20. Why is that ? Both offer a 1080p signal within a 60i stream. In fact, the 7D is letterboxed and pillarboxed, so the effective compression area is smaller. Should'nt it be easier to compress the 7D signal ?
__________________
mishra.tv Productions
A Sydney-based group for dance movement-based video and film productions.
Anmol Mishra is offline   Reply With Quote
Old March 22nd, 2010, 10:10 AM   #5
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
While it is true reduce pixel count of active data, the data is a lot sharper, to the point of aliasing in the 7D, whereas the HV20 is softer through an optical low pass filter designed for 1440 (less than the 7D's 1620 with OLPF for 5K.) 2.4Ghz C2D is on the edge for Real-time capture, with or without pulldown removal (generally pulldown helps a little.) Dropping to High will help, maybe enough.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman is offline   Reply With Quote
Old March 22nd, 2010, 09:01 PM   #6
Major Player
 
Join Date: Jun 2007
Location: Sydney Australia
Posts: 394
Hi David. This part I do not understand - so please humour me a but more. Pulldown requires extra processing due to the act of cadence detection. However, it probably saves some time spent doing compression.
Are you suggesting that the act of pulldown takes less time than compression for the extra 6 frames ? Hence the total time spent compressing 24P is faster than compressing 60i ?
__________________
mishra.tv Productions
A Sydney-based group for dance movement-based video and film productions.
Anmol Mishra is offline   Reply With Quote
Old March 22nd, 2010, 09:07 PM   #7
CTO, CineForm Inc.
 
Join Date: Jul 2003
Location: Cardiff-by-the-Sea, California
Posts: 8,090
It is basically a wash, the savings of 20% reduction in frames to encode, is almost consumed by the pulldown detection filter.
__________________
David Newman -- web: www.gopro.com
blog: cineform.blogspot.com -- twitter: twitter.com/David_Newman
David Newman 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 > Cross-Platform Post Production Solutions > CineForm Software Showcase

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:19 PM.


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