How do I change the format of a video?

How can I "change" the format of standard video to look like Letterbox Format?

• I shot some regular video and downloaded it to my computer. I would like to change the format-look so it resembles a Letterbox movie - so it would look like a wide-screen film when played. How can I place the 'black bars' above & below the image to crop it into looking 'widescreen'? Also - I need to be able to adjust & move the placement of the 'Letterbox format'.... Because every shot in the original video is framed differently - I cannot use a 'crop' that 'always frames the middle of the image' - in the same place all the time. Every shot in the video is composed differently and I will have to crop sometimes to the upper part of the frame and other times to the middle or lower parts. So whatever cropping software I use - it has to be adjustable. I thank you very much for your help!

• Answer:

  download or buy a adobe Premiere cs4 in the transition section search or CROP then you can crop you movie from top and bottom and you can also apply these on each scene.