This is a newer compressed audio format that is open source and typically has better compression-to-audio quality than MP3s. The files typically end with .ogg. Overscan - The adjustment of a TV set so that all four edges of the video frame are slightly outside the screen. Today's TV sets don't suffer from picture shrinkage as much but overscan still occurs and too much of it is now regarded as a quality control deficiency. Still, TV producers keep important material away from the edges of the video frame, and many video cameras have marked in their viewfinders a "safe area". Sometimes the electronics in the TV set are deficient (rounded off horizontal and/or vertical sweep sawtooth waveforms) that the extreme edges of the picture are "squished" and overscan is deliberately used to hide this distorted material outside the screen borders.[see also Underscan

Ogg Vorbis is an "open-source" digital audio compression format. like MP3, It is a "lossy" compression system, removing frequencies deemed inaudible. Both formats offer variable-bitrate encoding options, for better efficiency. But the algorithms Ogg Vorbis uses to decide which information to discard differ from those used by MP3. Proponents claim that the Ogg Vorbis format outperforms MP3, producing files that are significantly smaller than MP3s of similar sound quality (or files that sound better than similarly sized MP3s). View Ogg Converter.

Ogg Vorbis is a new audio compression format similar in function to MP3 or WMA. It is different from these formats because it is completely free, open-source, and non-patented.