This problem has been resolved. After enable 3D Rendering, MMR can work.
Per Pg12 of VMware Horizon View Feature Pack installation and Administration Guide:
System Requirements for Windows 7 Multimedia Redirection To support Windows 7 Multimedia Redirection (MMR), your Horizon View deployment must meet certain software and hardware requirements.
Horizon View desktop
- The desktops must run 64-bit or 32-bit Windows 7 operating systems.
- 3D Rendering must be enabled on the desktop pool.
- The desktop virtual machines must be virtual hardware version 8 or later.
- Users must play videos on Windows Media Player 12 or later.