Theora

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

Identification
A Theora bitstream begins with the byte, followed by ASCII "". This signature will appear somewhere in most any kind of file containing Theora video.

A simple Ogg Theora file begins with "", 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.
 * Theora Specification

Software

 * VLC
 * libtheora

Sample files

 * https://samples.ffmpeg.org/ogg/Theora/
 * https://telparia.com/fileFormatSamples/video/oggTheoraVideo/

Links

 * theora.org
 * Theora