View source for MSYS/MinGW

== Summary ==
In order to build FFmpeg using Visual Studio, we must still run FFmpeg's configure and make from a bash shell.  This requires us to install MSYS/MinGW.

Here are a few details to note:
:* It is preferred that you use an installer so we can auto-locate the install from the mythtv build. (if not you will have to set the <tt>MINGW_INSTALLDIR</tt> environment variable
:* Need to select "'''MSYS Basic System'''" and "'''MinGW Developer ToolKit'''" options
:* Need to rename msys version of link.exe so that the visual studio link.exe is used.

== Installing MinGW ==

This guide used the latest build of mingw-get-setup.exe from the following site:
:http://sourceforge.net/projects/mingw/files/Installer/mingw-get-inst/

Defaults were used except the following:

On the '''Select Components''' screen, make sure to select '''MSYS Basic System''' and '''MinGW Developer ToolKit'''

[[File:MinGW-Setup-Components.png]]

== Post Install Steps ==

Once the installation is finished, we must make some changes to the environment.

[[File:MinGW-Link-Rename.png|thumb|right]]

:1 - Open a '''“Visual Studio Command Prompt (2010)”'' command prompt.
::We need to have the Visual Studio environment setup.

:2 - Launch msys.bat
:: You need to specify the complete path to it (i.e. c:\MinGW\msys\1.0\msys.bat )

::This will start a mingw shell with the environment setup to use visual studio.

:3 - Then execute the following commands:

::Find where mingw is getting link.exe from:
:::<tt>'''which link'''</tt>

::Change to the directory that it’s located in (should be /bin)
:::<tt>'''cd /bin'''</tt>

::Rename link.exe to something else:
:::<tt>'''mv link.exe link-mingw.exe'''</tt>

::You can verify that you are getting Visual Studios version by running which again  (Your path will vary based on where you have visual studio installed.

:4 - Set the environment variable MINGW_INSTALLDIR to your MinGW install directory (in this example, c:\MinGW).