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Matthew, you will need to adjust the Scale. Under the Properties panel, expand the Motion effect and adjust the Scale slider. Somwhere around 55% to 60% will give you a vertical video with no cutting off of the video. You will however, have large black bars on each side of the video.
Hope this helps.
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Actually, it did keep the Aspect Ratio, as it is defined, but instead of a horizontal Aspect Ratio of say 4:3, you now have a vertical Aspect Ratio of 4:3. If it kept the horizontal, your image would be squashed in one dimension and then stretched in the other - not what you would likely want.
What you need to do is now treat your vertical image. In most cases, I find it preferable to use the fixed Effect>Motion>Scale, and then effectively crop off parts of the top, or the bottom, or both. This has the disadvantage of having to Scale the image up, and it will begin to degrade in quality, so keep a close eye out for that.
Depending on a few factors, one can use certain artistic treatments to use the vertical image in your horizontal Frame: one could use it as a PiP (Picture in Picture), one could create a background, and just use Motion>Scale to drop the vertical dimension to match the vertical dimension of the Frame, letting the background show on probably both sides. Some videographers will shoot two shots with the camera 90 degrees out of orientation, i.e. on its side, when they want a "split-screen," i.e. PiP with two, side-by-side images, and just Rotate both Clips, and align them in the horizontal frame.
Now, what was your purpose for shooting with the camera on its side? What effect were you trying to obtain?
If this was a mounting issue, such as the camera had to be mounted on its side to get it where it was needed, then the trick is to frame less tightly, knowing that you will be effectively cropping off some of the image, when you Rotate.
I'm working with a GoPro MP4 video that was incorrectly recorded upside down. It is an unedited 21 minute clip that I need to extract shorter chosen clips from. I tried, as incorrectly mentioned above, Picasa to rotate it. It will for viewing, but you can't save it or overwrite the original file except in a .JPG format... not much help. Would it be easier for me to attempt to cut and splice viewing it upside down until I get the final sections prepared to import into P9 Project, then rotate them separately? Or, should I import the entire, large files and rotate them and then export them as MP4 to re-edit later? I actually have 4 20 minute clips that are upside down.
I would just adjust the Fixed Effect>Rotation for the Clips, and then be done.
If you are going to edit, then Export/Share, planning on doing more editing in a PrE Project later, you might want to see this article: http://forums.adobe.com/message/4556586#4556586