If you want to reframe your shots for better (artistic) effect, and if you want to keep the end product as a normal PAL-sized video, then you should “crop” by zooming in on them slightly (or as much as is required), and then re-position (ie move) them in the x-y plane to get the best framing. You can do this with the standard “Motion” effect which is there by default on every video clip.
If the content to be cropped is generally top or bottom of frame, and you want to convert everything from 4:3 to 16:9, then start a 16:9 project, import your 4:3 footage and make sure “Interpret Footage” for each clip is set to D1/DV PAL (ie 4:3). The clips will appear full height but with black bands down either side. You can then use the motion effect to reposition and zoom in on them. Just click on the preview/monitor window and you will see a fram with handles around the video clip. Use the handles to zoom, and click anywhere inside the frame to drag the clip position to re-frame it.
If you’re not making a DVD or exporting to tape as the end product, but making a multimedia file for a web site or to play on a PC, there is another simple approach. Just use a standard 4:3 project, edit as normal and then make up a title with black boxes covering the areas that you want to crop (eg top and bottom). Place it on the highest numbered video track and stretch it to the length of the project. Then go through all the video clips and and reposition them behind the mask to improve the framing where necessary. Finally, export via the Media Encoder and use the cropping in the encoder settings to export just the video, and not the mask.
Hope that covers most of the options…
Martin
http://www.zenvideo.co.uk