How to make an anamorphic SD uncompressed quicktime from HD material? at DVinfo.net

Sami Sanpakkila · April 20th, 2010, 11:13 AM

Hi,

I need to provide a client with an uncompressed SD Quicktime file of my footage that is shot in HD 1280x720.

I choose save as quicktime, uncompressed template and set 720x576 frame size right? But what is the correct pixel aspect ratio for this?

Setting 1,333 leaves black borders on top and bottom, setting 1,457 leaves black borders on the sides. (These are the two Pixel aspect ratios I found by googling but didnt get a definite answer).

I also remember reading that HD widescreen and at least DVD widescreen differ slightly. When making a widescreen DVD it leaves slight borders on left an right, this would mean that 1,457 is the correct Pixel aspect ratio for anamorphic SD PAL widescreen?

Thanks!

Sami

Edward Troxel · April 20th, 2010, 12:15 PM

What happens if you set the frame size to 1024x576 and then set the PAR to 1.0?

Matteo Manson · April 20th, 2010, 08:35 PM

I think the pixel aspect ratio you want is 1.4568. You will get bars on your video because of the difference in aspect ratio (Overall ratio, not the pixel aspect). PAL pixel aspect is 1.0926 I believe, If it has to be rendered in SD either you have to have the bars or Pan n scan it (crop it to fit, the output aspect) which will cause some of the image to be lost. The other thing, of course, is anamorphic. If this is what you need... it pretty much medium specific.. if it is going to DVD and they want it in anamorphic format, you will want to use a PAL Widescreen setting in Vegas. Once the video is put into the DVD authoring program, they can configure the widescreen video to be encoded as anamorphic. This, I believe is the same pixel size but with a pixel aspect of 1.4568

Edit: I'm assuming PAL here, let me know if otherwise, also your source video is 720p, which is 1.00 pixel aspect, not 1.333. 1080p is, however. But the pixel aspect ratio of your source video is usually configured already and you should not need to change it really. You (should) only need to worry about your OUTPUT aspect and pixel aspect.

Sami Sanpakkila · April 21st, 2010, 03:45 AM

Hi

They need to put it on Digital Beta tape from their Avid editing machine. They told me to do the SD conversion so they dont have to do it (it would cost extra for my client).

Yes, sorry I didnt mention that I work in PAL land.

Sami Sanpakkila · April 21st, 2010, 03:47 AM

Quote:

Originally Posted by Matteo Manson

I think the pixel aspect ratio you want is 1.4568.

When I set it to 1.4568 Vegas automatically rounds it up to 1.457, is this supposed to happen?

Matteo Manson · April 21st, 2010, 09:50 AM

According to my calculation it makes a difference of less than one pixel, but I will defer to better judgement if someone says otherwise

April 20th, 2010, 11:13 AM	#1
Sami Sanpakkila Major Player Join Date: Nov 2007 Location: Finland Posts: 317	How to make an anamorphic SD uncompressed quicktime from HD material? Hi, I need to provide a client with an uncompressed SD Quicktime file of my footage that is shot in HD 1280x720. I choose save as quicktime, uncompressed template and set 720x576 frame size right? But what is the correct pixel aspect ratio for this? Setting 1,333 leaves black borders on top and bottom, setting 1,457 leaves black borders on the sides. (These are the two Pixel aspect ratios I found by googling but didnt get a definite answer). I also remember reading that HD widescreen and at least DVD widescreen differ slightly. When making a widescreen DVD it leaves slight borders on left an right, this would mean that 1,457 is the correct Pixel aspect ratio for anamorphic SD PAL widescreen? Thanks! Sami __________________ www.samisanpakkila.com www.vimeo.com/samisanpakkila

April 20th, 2010, 12:15 PM	#2
Edward Troxel Sponsor: JET DV Join Date: Dec 2001 Location: Southern Illinois Posts: 7,953	What happens if you set the frame size to 1024x576 and then set the PAR to 1.0? __________________ Edward Troxel [SCVU] JETDV Scripts/Scripting Tutorials/Excalibur/Montage Magic/Newsletters

April 21st, 2010, 03:45 AM	#4
Sami Sanpakkila Major Player Join Date: Nov 2007 Location: Finland Posts: 317	Hi They need to put it on Digital Beta tape from their Avid editing machine. They told me to do the SD conversion so they dont have to do it (it would cost extra for my client). Yes, sorry I didnt mention that I work in PAL land. __________________ www.samisanpakkila.com www.vimeo.com/samisanpakkila

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

April 20th, 2010, 08:35 PM	#3
Matteo Manson Regular Crew Join Date: Nov 2009 Location: Edmonton, Canada Posts: 37	I think the pixel aspect ratio you want is 1.4568. You will get bars on your video because of the difference in aspect ratio (Overall ratio, not the pixel aspect). PAL pixel aspect is 1.0926 I believe, If it has to be rendered in SD either you have to have the bars or Pan n scan it (crop it to fit, the output aspect) which will cause some of the image to be lost. The other thing, of course, is anamorphic. If this is what you need... it pretty much medium specific.. if it is going to DVD and they want it in anamorphic format, you will want to use a PAL Widescreen setting in Vegas. Once the video is put into the DVD authoring program, they can configure the widescreen video to be encoded as anamorphic. This, I believe is the same pixel size but with a pixel aspect of 1.4568 Edit: I'm assuming PAL here, let me know if otherwise, also your source video is 720p, which is 1.00 pixel aspect, not 1.333. 1080p is, however. But the pixel aspect ratio of your source video is usually configured already and you should not need to change it really. You (should) only need to worry about your OUTPUT aspect and pixel aspect.

April 21st, 2010, 09:50 AM	#6
Matteo Manson Regular Crew Join Date: Nov 2009 Location: Edmonton, Canada Posts: 37	According to my calculation it makes a difference of less than one pixel, but I will defer to better judgement if someone says otherwise