You can not mix video types in version 4 of Premiere Elements. That was a feature added in version 11.
Version 4 is actually kind of primitive. I think you'll find most of your issues go away if up use version 11 instead.
(And, no, I do not work for Adobe and I don't make any money from your purchase. Your workflow just demands this upgrade.)
Meantime, in the short-term, you can right-click on the squashed clip in your media panel and select Interpret Footage. Change the Pixel Aspect Ratio.
This should solve your aspect ratio issue -- however, it won't resolve some of the other issues you'll see when you mix media from different cameras. In your output, for instance, you'll likely to see stutrrering or shakiness in some of the video formats you've added.
With PrE 4.0, and mixed footage, I would adopt a workflow such as this:
- Create a Project that matches the footage from each camera, as closely, as is possible, i.e. three separate Projects - one for each camera's footage. This step is VERY important, and if needed, use G-Spot, or MediaInfo (both free utilities) to gather the full details of each type of footage.
- Edit the material from each camera pretty loosely, i.e. not Trimming Clips too tightly, or adding any Transitions - you will do that later.
- Scale smaller material up to 720 x 480, if necessary.
- Export the Timeline from each Project to DV-AVI.
- Create a new Project, to match DV 720 x 480, and Import the DV-AVI files from the three previous Project into that.
- Edit tightly now, Trimming as needed, and adding Titles, Transition, etc., as required.
Note that if any Scaling is reqired, the quality from that camera's footage will decline a bit, but still probably be OK.
Trial and error
I ended up doing this
Rightclick pic in Sceneline
click show properties (couldn't find Interpret Footage)
untick constrain proportions
reduce scale height (from 100 to 81.2)
haven't done disc yet so i don't know what it's going to look like on the TV when i play it
wish me luck
PS Instruction book mentions that it accepts lots of different files... I can't see that it says I can't mix them in one project
(but theres lots of stuff NOT in the instruction book! .... at least it had one, it makes life a little easier)