Theora

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File Format
Name Theora
Ontology
Extension(s) .ogg, .ogv
PRONOM fmt/945
Released ≤2008

Theora is a compressed video stream format. It is often used with the Ogg container format, resulting in a file format called Ogg Theora.

Contents

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.

Software

Sample files

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