Wut ? C

AviStruct* GetVideoInfo(char*file)
{
    AviStruct* MyVideo = (AviStruct*)s_alloc(sizeof(AviStruct));
    FILE*f = fopen(file,"rb");
    if (f)
    {
        unsigned int dwRate;
        unsigned int dwScale;
        unsigned int dwLength;
        fseek(f,0x84, SEEK_SET );
        fread(&dwRate,4,1,f);
        fseek(f,0x80, SEEK_SET );
        fread(&dwScale,4,1,f);
        fseek(f,0x8C, SEEK_SET );
        fread(&dwLength,4,1,f);
        fseek(f,0x40, SEEK_SET );
        fread(&MyVideo->width,4,1,f);
        fseek(f,0x44, SEEK_SET );
        fread(&MyVideo->height,4,1,f);
        MyVideo->fFps = (float)((float)(dwRate)/(float)(dwScale));
        MyVideo->fDuration = (float)((float)(dwLength)/(float)(MyVideo->fFps));
        return MyVideo;

    }
    return 0x0;
}

Nice error checking everyone! Also I am impressed by your endian neutrality, and your capability to work on systems where an int is not 32 bits.

Maybe you could only allocate the memory if the file opening was successful? Just a little tip ;)

NIGGERS