Theora
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Theora is a compressed video stream format. It is often used with the Ogg container format, resulting in a file format called Ogg Theora.
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Identification
A Theora bitstream begins with the byte 0x80, followed by ASCII "theora". This signature will appear somewhere in most any kind of file containing Theora video.
A simple Ogg Theora file begins with "OggS", and has the Theora signature at offset 28. But the signature will appear later in an Ogg Skeleton (video+audio) file that uses Theora.
Specifications
See also Ogg#Specifications.
