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MPEG-2 has both a video and an audio component, and is a standard for proper decoding of both by MPEG-2 compliant devices. The audio portion is MPEG-2 Layer 3, also known as MP3, while the video portion is also known as H.262. The H.262 standard was the ITU replacement for H.261, the standard for digital videoconferencing transmission, as well as MPEG-1. H.262 never caught on in videoconferencing, as it was rapidly followed by the better compression and packet-based nature of H.263, but H.262 became highly popular for DVD and broadcast transmissions.