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Exporting to desired aspect ratio
Hi there,
I’m running Adobe Premiere Pro 7, and captured my footage from a Sony HDC-HC9 camera, (PAL, aspect ratio 16:9)
In my project setup i selected DV Playback as the editing mode along with all the appropriate settings for the camera i was using. (D1/DV PAL Widescreen 16:9 [1.422] ),frame rate set to 25 fps.
The only problem i have is i would love to export the video to the desired aspect ratio of 720 x 480, (as opposed to 720 x 576).
However, when i do so a fair portion of the bottom half of the screen (footage) gets cut out.
I have tried a few combinations of things (like starting the project on both DV Playback/video for windows as the editing mode, making sure 720 x 480 is set before exporting), but it either just cuts out the bottom bit of footage once exported or a horrible black border is made around the footage and the quality also seems reduced.
So basically, i just would like to know if there is a way to convert my 720 x 576 .AVI file to 720 x 480 aspect ratio, while keeping the same quality and not having any footage missing from changing the aspect ratio. (and keeping it all in PAL).Many thanks
Dirk -
2 Replies
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[Dirk van Tonder] “i just would like to know if there is a way to convert my 720 x 576 .AVI file to 720 x 480 aspect ratio, while keeping the same quality and not having any footage missing from changing the aspect ratio. (and keeping it all in PAL).”
Why are you trying to convert from a 720×576 format(PAL) to a 720×480 format(NTSC), to keep it all in PAL and maintain proper viewing aspect whether 16:9 or 4:3 you have to use a 720×576 pixel matrix and change the virtual pixel aspect according to the screen. -
What you are attempting is not pixel aspect ratio, but dimension rescaling.
Pixel aspect ratio is the mathematical stretching of a square pixel to something wider or taller than itself to produce say SD/DV anamorphic 16:9.
There will always be a loss of something ad you are either forfeiting pixels to squeeze down to the lower line count or maintain the integrity of the pixel and lose some picture so you use the clean 480 lines from 576 and lose the remaining lines.
What I feel is unclear is your training behind going from 576 to 480 lines. Be definition you are attempting to conform a superior line count of the PAL SD/DV standard and degrade it down to the NTSC SD/DV standard.
If you want to export in square pixel aspect ratio then you will need to work out the math. 720×576 would come out to 1024×576. But as you are then stretching the pixels to make new pixels that are a combination of side pixels there will be some softening. Not a great deal, but some.
Jon Barrie
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