![]() Scale factor for scaling the quantization matrices (see below).Īlthough, the length of the chroma V data is not indcated in the slice header, it can be easily calculated as follows: Thus, only one slice height = 1 macroblock is supported. Ideally slice height = 2 ^ slice_height_factor but in all known decoders only the value of "0" for that factor is allowed. Supported slice sizes are therefore 8, 4, 2 and 1 macroblocks wide. Must be at least 64 bits (8 bytes) long.Īt the same times it indicates the number of entries in the slice table. This header is present for every picture (field). Slices data array contains actual encoded macroblock data. Thus, it permits independent processing of the slices in means of multi-threading. ![]() Slice index table consists of 16bit entries - one for each slice - giving the length of the data for each slice. Therefore, those tell the decoder how the coded picture is subdivided. ![]() The picture header contains two important parameters: width and height factors of a slice. Only present if indicated by the bit "D" of the QMatFlags. Only present if indicated by the bit "C" of the QMatFlags.Ĭustom quantization matrix for chrominance.
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