Can I change the aspect ratio of existing projects?

Over the past few years, I created a number of iDVD projects of special occasions. I guess the default aspect ration in the older versions of iDVD was 4:3. I now have a widescreen TV and would like to view these videos in 16:9 mode. The TV can change aspect ratios but it distorts the video. Is there a relatively easy was to redo IDVD projects to change the aspect ratio to widescreen?

The TV can change aspect ratios but it distorts the video. Is there a relatively easy was to redo IDVD projects to change the aspect ratio to widescreen?
Depends on your goals here. You can duplicate what your widescreen TV and do fairly easily but you would still end up with screen distortion if you use the entire 4:3 display area. It is is also reasonably easy to crop your 4:3 aspect to a 16:9 area within the 4:3 viewing area and burn this to a DVD. While this would prevent distortion, part of your viewing area would be lost and the result would be the same as using the the "Zoom" display on your widescreen TV. A third option might be to select a 16:9 viewing area within the original 4:3 display area. Unfortunately, this would would normally require an advanced editing application or cropping and scaling either as a whole or in selected segments. In either case it requires a much greater effort on the part of the user.
In short, actually changing an aspect ratio from is original aspect is either easy but causes distortion or it is difficult and time consuming. Further, in either case you are merely duplicating what your TV can already do. If you don't want distortion, use 16:9 "sourced" (either original or cropped) content. If you want to reduce the distortion (and your particular TV has the option), use the "Justify" viewing option which applies little or no distortion at the center of the viewing area and most distorion towards the left-right edges of the screen. Otherwise learn to live with the distortion and decide whether you prefer the distortion being applied to the DVD or just on the viewing screen.

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