Change pixel aspect ratio

Hi all,
My school requires me to produce all my videos in a format of 768px by 576px, square pixels, PAL format. I need to know how to change the pixel aspect ratio to 768x576 with the standard PAL format and square pixels. I can see that when you start a project you can set the size, but the boxes that contain the pixel size are shadowed out and I can't select them to change them. I have also tried to modify the project after it was created, using project settings and sequence settings, but again, I was not able to select the boxes that included the pixel aspect ratio.
Please help soon, as my project is due within hours.

My source material is 768x576 animations from Maya. The output needs to be .avi format, but it's not going onto a DVD or a DV tape or a web video, it just needs to be uploaded to my instructor's computer.
I am trying to export a file with the correct aspect ratio now. I set the output to codec=none, and changed the aspect ratio to 768x576. It seems unable to output the file, as I have tried four times and it has given me an error each time. Is a codec necessary? Is that what's freaking it out?
Also, the final video will only be 2:28 long, and I have set the scratch disk to a drive on my computer that has 78 GB free, so I hope it is not running out of processing space.
Thank you for your help and patience with this problem. I'm not sure I get the reason for the format myself, which is probably why I'm having trouble explaining why this is so important. However, my instructor told us numerous times that we absolutely had to have a final file that was 768x576, so I figured I had to make every effort to get it done that way.

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Once you have created a properly configured sequence,
you can copy (Ctrl+C) then paste (Ctrl+V) your already edited
clips into the newly created sequence.
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http://www.video2brain.com/en/lessons/changing-a-sequence-to-match-a-clip
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http://help.adobe.com/en_US/premierepro/cs/using/WS3E67AF4C-B2A2-4f04-90B4-F8CCFB74B144.ht ml#WSd79b3ca3b623cac941d41a681247d1f35a4-7fff
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http://www.video2brain.com/en/lessons/whats-the-best-export-format-or-codec

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Hi Kevin, a mix of BMPCC and 5Dmk3 Magic Lantern. ML raw at 60p has a non-standard PAR, most of my footage is shot in this format. I need 0.65, the closest is 0.9091. I was disappointed at first to find no ability to manually enter the value, then elated to find the Interpretation rules text file, then disappointed again to find it doesn't work...hoping this ends well!

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Hey folks, please be gentle, I'm really new to After Effects.
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Mylenium, thank you! Yeah, pixels are pixels, darn it!
Please let me just clarify ...
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Anamorphic Pixel Aspect Ratio

I am confused on all the different ways to get the "cinematic look". There are various ways to do this and I want minimal distortion. I have PE 10, source Canon T3i in camera settings are 1920 by 1080 23.976fps. Initial project settings are DSLR>1920 by1080>24fps, square pixel ratio 1.0.
My first question
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-buying anamorphic lens with an adapter that screws onto one of your prime lenses is the best option but it is a pain to have to deal with and is very expensive.
The easiest option is to select a title and put two black rectangles over your footage to mask it. I don't want to do this because you lose some of your footage and I would like to preserver all the footage if possible.
Thanks

I could be mistaken..I'm not even sure
Premiere says it will "Conform" the "Pixel Aspect Ratio". When I select "D1/DV NTSC Widescreen 16:9 (1.2121)" the pixel aspect ratio is changed from its original 1.0 square pixel to 1.2121. This is a screen shot of what I have been encountering. When this happens you do not lose any of the original footage by covering some of it up via a title and you get the "cinematic look" the wide screen look. So Yes, I am trying to get the 2.35:1 movie frame that you mentioned. That’s what I'm ultimately aiming to get. (the clip as you see it has yet to be changed, have not applied it yet so no black bars.
This is what it looks like with the "D1/DV NTSC Widescreen 16:9 (1.2121)" conversion applied.

Stills: Pixel Aspect Ratio from File is Wrong

The photo montage I'm working on is D1/DV NTSC Widescreen 16:9 (1.2121). I shoot the pix with my SONY Z5U and the raw stills are all 1440x810 72 dpi, square pixels. To conform them to my PPro project, I change their dimensions to 720x480 and I change the Pixel Aspect Ratio to D1/DV NTSC Widescreen (1.2). But when I import these stills into PPro they all appear squeezed and their aspect ratio comes up as D1/DV NTSC (09091), so I have to manually change it to D1/DV NTSC Widescreen. How can I get these stills to automatically be seen at Widescreen?

Well, the original pix are 1440x810. If I were to change just the height to 480 and Constrain Proportions, the new dimensions would be 853x480 (thereby maintaining the aspect ratio). And this IS square pixels. So changing the dimensions to 640x480 would just thin out the image.

Export Frame - Pixel Aspect Ratio

The video in my timeline is 720 by 480 (1.2121). When I clip on "Export Frame" in the program window it exports a jpg that is 720 by 480 (0.9091)
I know I can right click on it and "modify - Interpret footage" and correct the pixel aspect ratio.
My question is "Why is it doing this and how can I correct it"?
Is their a setting I'm missing? Why does it change the pixel aspect ratio?

The jpeg is not square. The pixel aspect ratio would be 1 and not .9091, if it were.
I have two computers. On one the "Export Frame" exports the jpeg with the same pixel aspect ratio.
The other machine changes the pixel aspect ratio from 1.2121 to .9091.
I can't find any differences in my settings.

Custom Pixel Aspect Ratio (After Effects CC 2014)

Hi All,
How do you create a custom Pixel Aspect Ratio for After Effects CC 2014. I need a PAR of 3.3, as it would help me solve a technical problem i've been having with projection mapping.
I've tried editing the Interpretation Rules.txt file which was hidden within the Users\Appdata\Roaming\Adobe\After Effects\13.1 Folder. To remove the last # so i can at least see that I can set up a custom PAR.
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I've also made the same change to the Interpretation Rules.txt file in the Premiere PRO CC 2014\Plug-ins\en_US\ folder.
And I've restarted my PC after changes just incase Media Core wasn't updating itself properly.
I can see the Custom PAR as an export option out of Media Encoder. But thats not what i need. I need to be able to correct a render which had a PAR of 3.3 without losing pixel information, much like an Anamorphic workflow.
Anyway, Any help would be appreciated.
Thanks!
Evan

Hi Rick,
You're right, it's no known PAR... completely arbitrary and custom to this particular job. I'll run you through my process.
I have a projection surface (a basketball court) Which needs to have content designed onto it which is viewable from one perspective point (camera 1) in the stadium. The problem is that Camera 1's viewing angle to the court is quite shallow.
This is what Camera 1 sees:
I will be generating like this for the surface so that it looks like a deep 3d surface from "camera 1"
Now, the problem is that when I perspective correct the renders to fit what the projector will be projecting from straight down. There isn't enough pixel information for the height of the image. Meaning the pixels will smear.
This is the image that would be projected from a top mounted projector to achieve the 3d effect from the image above, you can see the loss of information in the the height pixels.
My solution for getting more information into the height is to render out of our 3d packages with a Pixel Aspect Ratio of 3.3. This was the sweet spot I found to get enough pixel information to match the pixel output of the projectors.
The resulting render looks like this (note, the angle of the camera hasn't changed)
As you can see, there is more height detail now, which will mean that that last row of pixels will be remain fairly sharp.
So, at this point, I can render from my 3d applications, and conform to the projector dimensions, with very little information loss in the height of the projected image, and without compromising my 3d persepctive.
I'm using the plugin "Camera Mapper" to project this render onto a plane which gets me the full frame of the projector at the right resolution, 4608 x 2304
The tricky part how to composite elements into the scene in an intuitive way.
If i want a horse to look like its jumping through the scene from "camera 1", like this:
Then in the that contains all the information, It will look like this:
Now that's all well and good, but it'll be harder to create realistic looking effects from this view, because they'll all need to be stretched.
I'd like to retain all the image information and just view the comp as though it's squished down.
I imagine this could be done easily by changing the comp settings to a PAR of 3.3.
That way, all the pixel information remains, but i can design in a realistically proportioned composition.
I hope that gets you up to speed on my issue, and my request for a solution.
So, in summary. I'll I'm really looking for is a way to customise the PAR options so that I have a custom available that I can apply to this, and only this scene.
Does this makes sense?
Cheers,
Evan

Change pixel aspect ratio

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