theora codec Theora is a general purpose, lossy video codec. It is based on the VP3 video codec produced by On2 Technologies.
header| Name | Type | Size (bits) | Description and restrictions | | VMAJ | Integer | 8 | major version number | | VMIN | Integer | 8 | minor version number | | VREV | Integer | 8 | version revision number | | FMBW | Integer | 16 | width of the frame in macro blocks | | FMBH | Integer | 16 | height of the frame in macro blocks | | NSBS | Integer | 32 | total number of super blocks in a frame | | NBS | Integer | 36 | total number of blocks in a frame | | NMBS | Integer | 32 | total number of macro blocks in a frame | | PICW | Integer | 20 | width of the picture region in pixels | | PICH | Integer | 20 | height of the picture region in pixels | | PICX | Integer | 8 | X offset of the picture region in pixels | | PICY | Integer | 8 | Y offset of the picture region in pixels | | FRN | Integer | 32 | frame-rate numerator | | FRD | Integer | 32 | frame-rate denominator | | PARN | Integer | 24 | pixel aspect-ratio numerator | | PARD | Integer | 24 | pixel aspect-ratio denominator | | CS | Integer | 8 | color space | | PF | Integer | 2 | pixel format | | NOMBR | Integer | 24 | nominal bitrate of the stream, in bits per second | | QUAL | Integer | 6 | quality hint | | KFGSHIFT | Integer | 5 | amount to shift the key frame number by in the granule position |
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