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Determining Pixel Aspect Ratio


Jeff Mottle
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Hi all,

 

I'm in the process of editing the reel for the VisMasters awards ceremony and have videos in MANY different sizes and formats. The one problem I am running into is how to determine the original pixel aspect ratio of the raw footage. I have QuickTime and AVI. I can easily determine frame rate and pixel size, but how do I determine the pixel aspect ratio?

 

Jeff

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Are you referring to right click on your video, select media tab, then the pixel aspect ratio pull down? Or is there a way to automatically match project p.a.r. when adding a new clip?

 

Yeah I was using the Media tab to do it. I've not seen a way to automatically do this.

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Does QT even use PARs? When authoring from Premiere, if I want to write a 720 wide file with a PAR 1.2 (which is the way to create a .avi) that's what I set, but the same animation to QT must be set to the end display size of 864 or it displays squished. My impression is that QT does not use PAR for playback. Maybe that's just how Premiere works?

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Quicktimes always play back movies with square pixel aspect ratios, but the file will carry the attributes of a special pixel aspect ratio. In this case quicktime is really more of checking tool rather than proofing, any video editing or compositing software that imports quicktime should recognize embeded pixel aspect ratios. You should also be able to force pixel aspect ratio if it is somehow lost.

 

Good luck with the editing!

 

-Nils

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