MPEG-4标准笔记

mcsel: This is a 1-bit flag that specifies the reference image of each macroblock in S-VOPs. This flag is present only when sprite_enable == “GMC,” vop_coding_type == “S”, and the macroblock type specified by mcbpc is “inter” or “inter+q”. mcsel indicates whether the global motion compensated image or the previous reconstructed VOP is referred to for interframe prediction. This flag is set to ‘1’ when GMC is used for the macroblock, and is set to ‘0’ if local MC is used. If mcsel = “1”, local motion vectors are not transmitted. The default value for mcsel is ‘1’ (i.e. prediction using GMC ) when sprite_enable == “GMC,” vop_coding_type == “S”, and not_coded == ‘1’.  

intra and intra+q macroblock?

inter and inter+q macroblock?

stuffing macroblock? 

MB STUFF: Macroblock Stuffing11 编码量不足时之Dummycode(摘至http://blog.csdn.net/wxtsmart/article/details/2558850)

macroblock_stuffing /*宏块填料，为了防止下溢出，由编码器填入的数据，有它固定的11位bit格式就是’0000 0001 111’,当然 解决下溢出的方法还有很多，编码器可以在标题之前就加入填料位，或者可以减小quant_scale获得更多的编码系数等等*/(摘至http://blog.csdn.net/l5201314131413141314/article/details/7161189)