Stretch-o-vision is the practice of upconverting video from a standard aspect ratio to a widescreen aspect ratio. HDTV programming is broadcast in the 16:9 aspect ratio, a widescreen image. However, most SDTV programming is usually broadcast in the 4:3 aspect ratio. Most widescreen television channels broadcast non-widescreen footage with pillarboxing. Some television services however do not do this, choosing to stretch content to widescreen instead.
The use of the term "stretch-o-vision" to describe this process was popularized as a term for the practices of the high definition simulcast American cable television channel TNT, but this term has also been used to describe widescreen stretching in general.
Read more about Stretch-o-Vision: TNT HD and FlexView, Use of Stretching For Standard Definition Networks, See Also