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4:3 aspect ratio turns into 720 x 480
When I export a video shot in 4:3 aspect ratio using QT, the result is a distorted picture in which everyone looks 20 pounds heavier. Exporting using QT conversion and manually setting the pixel aspect ratio to match 4:3 works, but it can take hours to export. What am I doing wrong? Is there a way to export using QT without it automatically stretching a 4:3 video to 720 x 480?
David
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7 Replies
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You can probably find a great deal about this online. Try googling pixel aspect ratio. Or search wikipedia.
All the best,
Tom
Class on Demand DVDs “Complete Training for FCP6,” “Basic Training for FCS2” and “Final Cut Express Made Easy”
Author: “Final Cut Pro 5 Editing Essentials” and “Final Cut Express 4 Editing Workshop” -
I don’t understand your issue.
4:3 aspect ratio is 720×480 (DV codec (4:2:0 or 4:1:1)) or 720×486 (everything else besides DV in SD video (4:2:2)).
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Wayne Carey
Schazam Productions
https://web.mac.com/schazamproductions
schazamproductions@mac.com -
Hi Wayne.
I’ll try to clarify. I noticed that when I export using QT, the video just seemed stretched horizontally. It looked out of proportion compared to what I had been seeing in the viewer. I did some quick math 480/720 = .6666 indicating that the vertical dimension of the picture is 2/3 of horizontal dimension, but the vertical dimension should be 3/4 of the horizontal dimension: 3/4 = .75. I can export using QT conversion, specifying a picture size of 640×480 or 768×576, both of which work out mathematically, and the picture comes out in proportion. The problem is that process can take a couple of hours for a 20 minute video. It just seems like I’m missing something. Any ideas?
Thanks.
David
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Well… that is standard. This all depends on what codec are you using.
If you are using a non-square pixel codec, then Quicktime will show it slightly elongated. Quicktime is a square pixel program, and will adjust most of the time for most codecs.
Can you fill me on on some more details? What codec are you editing with, and what codec are you export to? Why do you need to export your video? For what purpose?
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Wayne Carey
Schazam Productions
https://web.mac.com/schazamproductions
schazamproductions@mac.com -
Not quite sure if I’m answering this the right way… I’m using DV NTSC Basic 48 kHz. I believe I’m using that both for editing and exporting. The purpose of this video is for broadcast on a college cable channel and to be posted on the college website. Are these the kind of answers you were looking for?
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This is one of the most FAQ’s in this forum.
By default QT Player display everything as Square pixels.
When imported to FC, printed to DVD, Broadcasted, etc they will look OK.
rafael -
Thank You!
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