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Compiling Mplayer for XBMC
Prerequisites

• MinGW
  
• MSYS
  
• TortoiseSVN
  

Getting Source
Using TortoiseSVN
If you have TortoiseSVN, you can skip the first two steps.

• Get TortoiseSVN installer from the TortoiseSVN site
  
• Install TortoiseSVN
  
• Right click in a directory and click "SVN Checkout"
  
• Enter URL of repository: https://svn.sourceforge.net/svnroot/xbmc...s/MPlayer/ in the dialogue window. (Note this will only download the Mplayer branch)
  

Building Mplayer
Build Environment Setup
To build mplayer you need to download and install msys.

• Get MingW 4.1.0 from SourceForge
  
• Run and Choose Full (It will download about 45mb in total)
  
• Get MSYS from SourceForge
  
• Install MinGW to C:\MinGW (The root is the best place)
  
• Install MSYS
  
• Complete the questions you get after the install in a command window
  
• Get GCC Core 3.4.4 from SourceForge
  
• Extract GCC-Core to a temporary folder, then copy bin,lib and libexec to the MinGW folder and overwrite
  

You should now have both the source and the building environment to compile a Mplayer.dll

Making the Mplayer.dll
This part of the how to assumes that you did install MinGW to C:\MinGW and download Mplayer to c:\mplayer-xbmc

• Run MSYS.BAT (located in C:\Msys\Msys.bat)
  
• Command Window should show type cd /c/mplayer-xbmc
  
• Type ./configurexbmc --disable-libavformat (Use the --disable-libavformat to shrink the dll further. May cause compability issues with certain codecs, yet to be determined)
  
• Wait till that finshes, with luck it should have no errors/problems
  
• Type make
  
• Type makedll
  
• Type exit
  

This how to is also on the wiki/manual