Green Screen and the HVX200 - Page 2 at DVinfo.net

Go Back   DV Info Net > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Panasonic P2HD / DVCPRO HD Camcorders
All AG-HPX and AJ-PX Series camcorders and P2 / P2HD hardware.


Reply
 
Thread Tools Search this Thread
Old May 27th, 2005, 09:09 AM   #16
Major Player
 
Join Date: Nov 2004
Location: Canada
Posts: 547
Down-converting 1080p DVCPRO-HD to SD will yield 4:4:4 SD and excellent keying. (essentially 100 Mbps 4:4:4 SD - uncompressed SD is 238 Mbps).

DVCPRO-50 will offer 4:2:2 SD at 50 Mbps, and will be inferior to 1080p DVCPRO-HD for SD keying.

At HD resolutions, on a per-pixel basis, DVCPRO-HD is just as compressed as miniDV, but offers increased colour information (4:2:2 over 4:1:1) and introduces more spatial compression. I would expect that at native 1080p resolution DVCPRO-HD will key about as well as miniDV, however, I do not have an appreciation for how large an effect mosquito noise has on a good key, in comparison with colour space. Does anyone know which is more important for good keys?

-Steve
Steven White is offline   Reply With Quote
Old May 27th, 2005, 02:22 PM   #17
Trustee
 
Join Date: Mar 2004
Location: Milwaukee, WI
Posts: 1,719
In order to try and get down converted HD close to a 4:4:4 SD the resolution would have to be half. The sad thing about DVCpro HD 1080 is that it is only 1280 pixels wide. This means in order to get a good 4:4:4 down convert you will end up with 640x540. This would then need to be scaled up and interpolated either to 720x480, 853x480, or 960x540.

Even though 4:2:0 HDV can offer problems in trying to get a good 4:4:4 at least it is 1440x1080. This means we can get a natural 720x540 image in 4:4:4 which can then be scaled down to a anamorphic 720x480 for DV or DVD. Of course these numbers only work great for NTSC. PAL would need to be scaled up to match it's resolution.

If you do not use a 1/2 scale ratio your luma and chroma pixels will not match pefectly so it wouldn't be a real 4:4:4 but an interpolated result.

At one point I heard a rumor that the Europe DVCpro HD specs were going to allow 1440x1080 since there is a lower framerate there is extra bandwidth to play with. I'm not sure if that is true or not but it would be nice.
Thomas Smet is offline   Reply With Quote
Old May 27th, 2005, 04:01 PM   #18
Major Player
 
Join Date: Nov 2002
Location: Tokyo
Posts: 898
thanks......

I appreciate your responces. I'll run some tests via the software trials.
Will be using a switcher. Any recommendations on a good one?
Dean Harrington 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 > Panasonic P2HD / AVCCAM / AVCHD / DV Camera Systems > Panasonic P2HD / DVCPRO HD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:36 PM.


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