I263

• FOURCCs: I263
• Company: Intel

General description

This codec is based on early drafts of the H.263 standard specification. It supports the following modes: Unrestricted Motion Vector mode, Advanced Prediction mode, PB frames mode, Improved PB frames mode (old version!) and Deblocking Filter mode.

Picture Layer

Data for each picture consists of a picture header followed by data for Group of Blocks, eventually followed by an end-of-sequence code and stuffing bits. The structure is shown in FIGURE 7/H.263. PSBI is only present if indicated by CPM. TRB and DBQUANT are only present if PTYPE indicates ‘PB-frame’. Combinations of PSPARE and PEI may not be present.

""Picture Start Code (PSC) (22 bits)"" PSC is a word of 22 bits. Its value is 0000 0000 0000 0000 1 00000. All picture start codes shall be byte aligned. This shall be achieved by inserting PSTUF before the start code such that the first bit of the start code is the first (most significant) bit of a byte.