If  your program needs to show videos can you use smacker  if you have to convert the video to another format. You can use allegro this way and let smacker convert to the FLC format to create a high performance DirectX accelerated application.
Mingw32 has the necessary import libraries but libvfw32.a is broken and you must get  some fixed libraries it is split up in 3 libraries because it links to 3 different dlls.
It is also necessary to get some header files.
 

I copied them from the Borland compiler include directory  you should also be able to get them from MSDN. They are part of the Platform SDK. Not everything of the above is absolutely necessary and I do not know if the  list is complete. You must also make some modifications before you start:

• DWORD_PTR is not defined so somewhere should this be added #define DWORD_PTR DWORD if you do not find a better place can you put it at top of the complaining file.
• I replaced INT_PTR with void *  in vfw.h but probably can this be solved better.
• In case you want to avoid some redefinition warnings can you get this slightly edited mmsystem.h the changes is just some definitions.
• In the header files for windows is constructs like this not unusual "typedef struct {... sometype f_name[] }" . Mingw32 does not allow the open [] and the common way to handle this is to replace it with [1] . Do that in vfw.h it can always be changed later if required.
• The sample code from Microsoft is rather old and is using HANDLE instead of HINSTANCE in some places, mingw32 does not like that. Another problem with the sample code is the resource files. Often can you use the .res file instead of the .rc file in case of trouble but this seems to be harder with the files from the samples. Some type casts may also be necessary.

For legal reasons is it a bad idea to distribute your program with files in the mp3 format. By changing the output plugin in winamp can you convert them to standard wav format. If you also want to do some editing is cooledit a good program. Allegro also has functions for audio streaming and datafiles that can be useful.

Not much to say about the input functions in Windows Multimedia so I give you some lnks instead.

 Start page for Windows Multimedia  at MSDN with link to on-line documentation for  Video for Windows ,  Multimedia Audio  and  Multimedia Input
 The Platform SDK  has the above information ready for downloading
 Video for Windows samples
 Multimedia Audio samples
 Multimedia Input samples
 Makefiles for building some Windows Multimedia examples with mingw32

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