DV PAL capturing question at DVinfo.net

Go Back   DV Info Net > Apple / Mac Post Production Solutions > Final Cut Suite

Final Cut Suite
Discussing the editing of all formats with FCS, FCP, FCE

Thread Tools Search this Thread
Old July 9th, 2008, 04:38 PM   #1
New Boot
Join Date: Nov 2007
Location: Nottingham, UK
Posts: 7
DV PAL capturing question

Hi there,

So, I've got a question that has been bugging me for some time, and having read through lots of forums I can't seem to get to the bottom of it.

When I record my video (on a PD 170P) I record in DVCAM and the aspect ratio is 4:3, right, unless of course I select the 16:9 option. On importing to FCP, I select the DV PAL 48 kHz setting and ensure that my sequence settings are the same. So far, so simple. However, on looking at the details of the capture preset, the frame size is automatically at 720x576 with an aspect ratio of CCIR 601/DV PAL (5:4).

But there is an alternative setting on the drop down menu that gives me the option of CCIR 601 PAL Sq. (4:3) and a frame size of 768x576.

Now, when I keep the original preset 5:4 ratio in the capture settings, it looks fine during play back but when actually capturing the image looks slightly stretched. But, having captured it looks fine in the viewer.

So, although it's not causing me an actual problem right now, I am still entirely confused, and want to get to the bottom of this - should I change the setting to CCIR 601 PAL Sq. (4:3)? Why is the preset 5:4? And why isn't it a problem? Many thanks to anyone who can put my admittedly a little pedantic mind at rest!
Matthew Whitney is offline   Reply With Quote
Old July 9th, 2008, 06:12 PM   #2
Go Go Godzilla
Join Date: Nov 2004
Location: Scottsdale, AZ USA
Posts: 2,765
Images: 15
Just to be clear: are you shooting NTSC and importing into a PAL timeline? If so that's why things are being "stretched" because there is a slight size difference between the PAL and NTSC standards.

However if you're shooting with a PAL camera then the PAL settings should match.

The answers to questions like this are right at your fingertips; from the FCP6 built-in users manual:
Attached Thumbnails
DV PAL capturing question-picture-1.jpg  
Robert Lane is offline   Reply With Quote
Old July 10th, 2008, 02:25 AM   #3
Major Player
Join Date: Sep 2006
Location: London, England
Posts: 969
It's just the shape of the pixels in CCIR 601. Nothing to worry about, FCP can handle it.
Liam Hall is offline   Reply With Quote
Old July 10th, 2008, 03:07 PM   #4
New Boot
Join Date: Nov 2007
Location: Nottingham, UK
Posts: 7
Hi Robert - I am shooting in PAL, so it's nothing to do with a conversion issue. It's more that I don't understand the significance of CCIR 601 - what is it and why are the pixels different sizes?

Liam - It hasn't been causing me any probs, I'm just puzzled - why is it being sqeezed to 5:4 during capture, but then expanding?

I've noticed that there's an option in FCP in the viewer size drop down that is "Show as square pixels" that is automatically selected. When I untick it, the image becomes 5:4 - squished!

Is there a good reason - tv compatibility or something - that it is captured with the 720x576 CCIR 601 (5:4) not the 4:3 option?

It is a bit acedemic, but still intriguing me.
Matthew Whitney is offline   Reply With Quote
Old July 10th, 2008, 03:30 PM   #5
Inner Circle
Join Date: Feb 2004
Location: switzerland
Posts: 2,133
768x576 is picture defined with square pixel.
it is an obsolete standard, since DV, everything is based on 720x576 with rectangular pixel.
it does not change the way image is displayed (it is still 4:3) as long the pixel ratio is properly set.
today the only other format to have square pixel is 1920x1080 and 1280x720.
all other format PAL DV, NTSC DV, HDV, PAL and NTSC wide screen have rectangular pixel.
this means the actual apparence of the video in a square pixel screen (like your computer) will look wrong (call it anamorphosed) if the player is not correcting it.
Giroud Francois is offline   Reply With Quote
Old July 15th, 2008, 07:42 PM   #6
New Boot
Join Date: Nov 2007
Location: Nottingham, UK
Posts: 7
Thanks Giroud, that was exactly the answer I was looking for. Is CCIR 601 a reference to the size/type of pixel then? It basically is, or at least defines, the pixel ratio?


Matthew Whitney is offline   Reply

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

(800) 223-2500
New York, NY

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

Texas Media Systems
(512) 440-1400
Austin, TX

Precision Camera
(800) 677-1023
Austin, TX

(800) 323-2325
Mineola, NY

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 > Apple / Mac Post Production Solutions > Final Cut Suite

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 06:50 PM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2018 The Digital Video Information Network