Selecting project settings by sequence
The basic rule of thumb when selecting project and sequence settings is to match the settings to your source material and not to the final output. Maintaining the original quality of source material means you’ll have more options later. Even if your goal is to create a low-resolution video to play on the Internet, wait until you finish editing, and then reduce the output quality settings to make your video Internet-ready.
You might have a mix of source media—wide-screen, standard, HDV, and P2, for example—among your project assets. With Adobe Premiere Pro CS5, you can create multiple sequences, each with a different media type or frame size, all in the same project.