play mp4 video on windows media player..

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    Once you have downloaded both Haali Media Splitter and FFDShow, you must first install Haali Media Splitter. Run the installer, and when the Options screen is displayed, check the Enable MP4 Support box. Proceed with installation. Windows Media Player can now open MP4 files, but not decode them.
  
  
• Next, FFDShow must be installed and properly configured. Run the installer, and when the Setup screen is displayed, ensure that Generic MP4 Support is checked, as well as H.264 / AVC, DivX, and XviD (these are usually selected by default). Click Next.
  
  
• Select the correct number of speakers for your current setup and click Next,then Install.
  
  
• When installation is complete, Windows Media Player can open and play MP4 files. Confirm this by right-clicking an MP4 file on your PC and selecting Open and Windows Media Player. You can associate MP4 files with Windows Media Player by right clicking the file and selecting Properties and Change next to the Opens With field.