the video size field allows you to select between the various sizes given below. changes made to video size take effect only after you exit the dialog.

   

    the width and height shown are in pixels for the north american ntsc-m video format in the square (standard) aspect ratio. for further details, refer to appendix c: video sizes.

    there is a fifth button, custom, that becomes selected whenever a non-standard size is entered in the custom size field. see proportion (pixel aspect ratio) for more detailed information.