Compositing with Z1U Footage at DVinfo.net

Go Back   DV Info Net > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-Z1 / HDR-FX1

Sony HVR-Z1 / HDR-FX1
Pro and consumer versions of this Sony 3-CCD HDV camcorder.


Reply
 
Thread Tools Search this Thread
Old April 16th, 2006, 10:23 AM   #1
Major Player
 
Join Date: Nov 2005
Location: Chehalis, WA
Posts: 513
Compositing with Z1U Footage

Hi,

I'm working on a project in which I've shot some 1080i 60 (or however you put it) footage on my Z1U.

I am now in the process of creating a 3D background in Lightwave, but am wondering what size to make my 3D images?

I tried 1440 x 1080 with the 1.33 aspect ratio, but when i bring them into After Effects, they are 'sqare pixels' and narrower than my Z1U footage.

I then tried 1920 x 1080 with 1.33 aspect ratio and that looks squished in After Effects.

If I render 1920 x 1080 sqare pixels, and bring that into my Cineform Comp then it looks fine.

Any thoughts on this? My goal is to produce the entire project in HDV and then output to DVD and Quicktime.

Thanks,

Jim
James Huenergardt is offline   Reply With Quote
Old April 18th, 2006, 05:28 AM   #2
Trustee
 
Join Date: Aug 2005
Location: Berkshire, UK
Posts: 1,562
May be a problem in AfterEffects...

Quote:
Originally Posted by James Huenergardt
Any thoughts on this?
I still use AfterEffects 6.0, and noticed a little repeatable bug in dealing with HDV - you have to set and unset the 1440x1080 pixel ratio a couple of times (e.g. it comes in as 1440x1080 but is wrong - you switch it to square pixel and it's very wrong, then switch it back to the correct setting and suddenly it's right).

I initially put this down to my senescent version of AE predating HDV, but it may be a deeper QT thing as QT sometimes makes the blanket assumption that everything's square pixels - hence a PAL MPEG2 in QT Player is reported as being 720x540 instead of 720x576, even though the latter is accurate. If QT Player passes this info to AfterEffects, AE takes it in good faith, and so to unset it then reset it allows AE to 'do the right thing' and get the correct aspect ratio.
Matt Davis is offline   Reply With Quote
Old April 18th, 2006, 09:24 AM   #3
Trustee
 
Join Date: Sep 2003
Posts: 1,435
I have to say that, before going into the image ratio issue, one should have a workable video source for compositing.

Based on my experience, Sony's HDV (which probably is one of the best in its class) is unpredictable and very hard to use for compositing. The culprit is MPEG2 compression macroblocks.

To address this specific issue, I built the entirely separate HD ingest PC system for uncompressed capture from Sony Z1/FX1's Component out. Sony's Component out is before any mpeg compression, so it's clean enough to use for greenscreen work.

Having said that, it is still possible to do compositing on mpeg-compressed footage, too. I did it, others did it. Just don't expect repeatable and stable results (you know how it goes, problem suddenly occurs when you are under the deadline etc.)

To see my own compositing efforts (using compressed video - I did not have my HD ingest system at the time...) just go to www.PrimeHD.com and click on "read more" under "Prime HD encodes music video for quality web view". I hope this may be of interest on the subject.
Alex Raskin is offline   Reply With Quote
Old April 18th, 2006, 09:29 AM   #4
Trustee
 
Join Date: Jun 2002
Location: Clermont, FL
Posts: 1,520
To change the initialization profile in After Effects 6.5 (7.0 already has this) to include a 1.33 pixel aspect ratio, and make native 1440x1080 compositions:

Go into the After Effects 6.5/Support Files/intepretation rules.txt file (also works with 6.0) and add this line to the bottom:
0, 0, 0, "0000", * = 4/3/"Custom Aspect", *, *, *

Export as 1440X1080 and use 1.33 - you will be happier in the long run.
__________________
Steven Gotz
http://www.stevengotz.com
Steven Gotz is offline   Reply With Quote
Old April 18th, 2006, 03:39 PM   #5
Trustee
 
Join Date: Aug 2005
Location: Berkshire, UK
Posts: 1,562
Quote:
Originally Posted by Alex Raskin
...one should have a workable video source for compositing... Sony's HDV (which probably is one of the best in its class) is unpredictable and very hard to use for compositing.
I've found it more forgiving in AfterEffects when pulled down to SD:

http://www.mdma.tv/HDV_chromakey_1.png - Here you see the raw footage with KeyLight applied - clean key, but the 4:2:0 is making it look like it's been cut out with a cheese grater.

http://www.mdma.tv/HDV_chromakey_2.png - Once the comp is shrunk down to SD, it's a lot happier and cleaner. Note the transparency on the RH arm. The grab is done at 1:1 so what you see is what you get - a lot cleaner and (crucially) a lot sharper than a DV chromakey, even with the best filters on the market (KeyLight, zMatte, DVmattePro).

Based on this, and the budget my clients can afford, I find HDV is the best way for me to shoot chromakey - it's better than DV, and it just would not happen if I had to go digiBeta.

Just for fun, here's the web version of the finished movie - the wierd arch thing was the hole it was projected into - it was about 15' high!

http://www.mdma.tv/movies/HDV_chromakey_3.mov - it's a bit of fun from the client, a VP of a huge company who was game for a laugh. Most definately NOT a pop video. :-)

Please don't trash HDV for chromakey at SD. It does work, repeatably.
Matt Davis 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

Omega Broadcast
(512) 251-7778
Austin, TX

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

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

EVS
(800) 238-8480
Glendale, 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 > Sony XAVC / XDCAM / NXCAM / AVCHD / HDV / DV Camera Systems > Sony HDV and DV Camera Systems > Sony HVR-Z1 / HDR-FX1

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:03 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network