Consider the following scenario: You use the Windows Media Video 9 Advanced Profile codec that is included with Windows Media Player 11 on a computer that is running Microsoft Windows XP or Windows Vista. You configure the Motion Vector Coding Method registry setting with a value of 1, 2, or 3 to code the motion vector information in field pictures. Then, you configure the Video Type registry setting with a value that indicates interlaced encoding. Also, you leave the Motion Search Range registry setting at the default value.

In this scenario, the resulting Windows Media Video bitstream may be incompliant with the VC-1 video codec specification. Because of this problem, bitstream errors may occur.