"2.2 Picture Region An encoded video frame in Theora is required to have a width and height that are multiples of sixteen, making an integral number of blocks even when the chroma planes are subsampled. However, inside a frame a smaller picture region may be defined to present material whose dimensions are not a multiple of sixteen pixels, as shown in Figure 2.1. The picture region can be o set from the lower-left corner of the frame by up to 255 pixels in each direction, and may have an arbitrary width and height, provided that it is contained entirely within the coded frame. It is this picture region that contains the actual video data. The portions of the frame which lie outside the picture region may contain arbitrary image data, so the frame must be cropped to the picture region before display. The picture region plays no other role in the decode process, which operates on the entire video frame." I have a PDF-version of the spec at http://www.speedsurf.to/maikmerten/ -- EN: Every mail bigger than 35 KByte will be deleted automatically from my mailbox. Please contact me before sending any attachments. DE: Jede Mail gr??er als 35 KByte wird automatisch aus meinem Postfach gel?scht. Bitte kontaktieren Sie mich, wenn Sie Anh??nge schicken wollen.