search for: aspectnum

...umMacroBlocksHigh (16 bits) //112 - 135 picturewidth (24 bits read, only 20 used) //136 - 159 pictureheight (24 bits read, only 20 used) //160 - 167 xoffset (8 bits) //168 - 175 yoffset (8 bits) //176 - 207 framerateNum (32 bits) //208 - 239 frameratedenom (32 bits) //240 - 263 aspectNum (24 bits) //264 - 287 aspectdenom (24 bits) //288 - 295 colourspace (8 bits) //296 - 319 targetbitrate (24 bits) //320 - 325 targetqual (6 bits) //326 - 330 keyframeinterlog (5 bits) Giving a theora ident packet a total size of 42 bytes. Cheers Zen.