VPSH（video plane with short header) OR TO a video object plane(vop)

abcd20061111

在吗。THE MP4 decoder supports simple profile level 1,2,3,the software decodes all upper layers and tells the hardware accelerator to decode a VPSH（video plane with short header) OR TO a video object plane(vop),中的VPSH，VOP是什么意思啊，那个大虾解释下，谢谢。