1749 Ogg Multimedia Container Audio, Video Ogg is a free, open container format maintained by the Xiph.Org Foundation. The Ogg container format can multiplex a number of independent streams for audio, video, text, and metadata. In the Ogg multimedia framework, Theora provides a lossy video layer. The audio layer is commonly provided by the music-oriented Vorbis format. Other audio coding format options include the Opus compression format, the lossless audio compression format FLAC, Speex for low bitrate voice data, and OggPCM for uncompressed PCM audio. This generic entry applies where available PRONOM signatures for Ogg do not yet apply to the file in question. In this instance you may wish to contact pronom@nationalarchives.gov.uk to help improve PRONOM's signatures. Text 1 Digital Preservation Department / The National Archives 21 Jul 2016 21 Jul 2016 application/ogg MIME fmt/944 PUID ogg File extension ogv File extension spx File extension opus File extension 1287 Ogg Container Capture pattern (“OggS”); stream structure revision (00h); flag: 1st page of a logical bitstream (02h) 1 Absolute from BOF 0 0 4F6767530002 Can contain 929 Ogg Vorbis Codec Compressed Multimedia File Can contain 1750 Ogg Theora Video Can contain 1751 Ogg Opus Codec Compressed Multimedia File Can contain 1752 Ogg FLAC Compressed Multimedia File Can contain 1753 Ogg Speex Codec Multimedia File Has lower priority than 929 Ogg Vorbis Codec Compressed Multimedia File Has lower priority than 1750 Ogg Theora Video Has lower priority than 1751 Ogg Opus Codec Compressed Multimedia File Has lower priority than 1752 Ogg FLAC Compressed Multimedia File Has lower priority than 1753 Ogg Speex Codec Multimedia File