Custom Pixel Aspect Ratio?

[Vince Becquiot]

No custom aspect ratios in Premiere.

Can you gave us a bit more detail on why and how you getting to 960×720. The only thing I can think off is going to P2 or a DVCPro HD tapes and there’s a Preset for that, 1.33.

Vince Becquiot

Kaptis Studios
San Francisco – Bay Area

[Ross Tokach]

interpretation is mostly done through metadata by now. You could try doing what you are doing in after effects, then reimport to premiere.

“Oop, I think my render is done!”

[Jasper Sanders]

Ok, I’ll just explain what I need done and hopefully somebody will know the best way to go about it. I’m adjusting some old pixelated animations I designed on a video game console (now emulated on the computer) to be used (letter boxed) in a 720p square pixel video.

Original output from console = 320×240 (square pixels)
I then upscale this (within the emulator) to = 960×720
(using a nearest neighbor type system giving perfect unblurred 3 times magnification)

This was then recorded with lossless screen capture to produce a 960×720 source video.

Now, in most cases, the actual desired viewing area is only 720×576. So the video needs to be cropped pixel accurately to this size. (120 off each side and 72 off the top and bottom.)

Now this is where the upscale also comes in handy.
The native output of the actual hardware on which it was designed (not the emulation) had a pixel aspect ratio that stretched the 720×576 to be 4:3. Now, obviously stretching it to a new PAR (according to my calculations 1.0666) will cause some very undesirable blur when it’s converted to 1:1. So the solution is to increase the width using a nearest neighbor resize to 4:3 (768×576).

This in effect will double every ~15th vertical row of pixels. Making the appearance of the stretching minimal, as the original “pixels” that are stretched are only stretched by 1/3.

This produces the cleanest sharp “pixels” and most accurate 4:3 output. I have done this with stills in photoshop and it worked flawlessly. I just need some help working out how to produce the same results on video.

A summary of what I need to do:

Losslessly crop 960×720 to 720×576
Nearest neighbor stretch 720×576 to 768×576

Thanks heaps,
Jasper

[Jasper Sanders]

Also, I just remembered that I don’t necessarily need to crop the video, as I already have a pixel accurate mask overlaying the video (that I forgot I was using).

So essentially this is very simple. All I need to know how to do is a nearest neighbor pixel stretch of 720×576 to 768×576. (As I originally wanted… lol)

Thanks again,

Jasper

[Ross Tokach]

Will cineform do that conversion if you import it into after effects and make it an animation first?

“Oop, I think my render is done!”

[Jasper Sanders]

I’m not sure, I’ve not worked with AE before, nor do I own it obviously. I’ll try to pick up their trial tonight. I thought AE was more designed for doing special effects than accurate video resizing?

Also, in my last post, I obviously was meant to say “So essentially … pixel stretch of 960×720 to 1024×720.” (not that it really matters at this point. I just need to learn how to do any neighbor stretch.)

Cheers

[Jasper Sanders]

OK, I’ve got AE now and I’m completely lost, lol… Point me in the right direction?

Thanks 🙂

[Ross Tokach]

basically you want to make a new sequence, the size of your native resolution then, attach it to an adjustment layer – adjustment layer the size of the new desired resolution. Then render a precomp. After you render the precomp lossless animation, open a new sequence with the size you want to finish at. Import the precomp. and go to filters > scale> and scale it up till the adjustment layer is gone and all you see is your footage filling the window.

Go a row or two pixels larger than you need. Then render it out as a cropped image. Then reimport the cropped image and duplicate it, on the duplicated layer=behind main image add smart blur and this should help seal any pixelation. Also boost up the color a bit on the layer with all the effects on it. maybe set the top layer to 98% opacity . Render it out as an animation and bring it into the cutting board. Happy cutting.

This is what I would try.

so, layer with effects goes behind the layer without effects.
Layer with no effects is at 98% opacity, layer with effects is at 100, boost up the color on the layer in without the opacity.

“Oop, I think my render is done!”

[Jasper Sanders]

Hi, thanks heaps for your time. I really appreciate it.

But, I can’t seem to follow your concept in my head nor can I in AE. I’ve been trying for hours without result.

[Jon Barrie]

Hi Jasper,

If all you want is to make a 960×720 video frame fit to a 1024×720 video frame then this is the simplest process… watch this video.

https://www.youtube.com/watch?v=XUZm_cF_8BY

– Jon Barrie

Jon Barrie
aJBprods
http://www.jonbarrie.net
http://www.suiteskills.com

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