怎样更新AVI文件的fps？

[smellteen]

怎样更新AVI文件的fps？
一个已经创建好的AVI文件，通过AVIStreamWrite写数据，最后写好后怎样怎样更新AVI文件的fps？
谢谢。

[windows_editor]

typedef struct _avistreamheader {
FOURCC fcc;
DWORD cb;
FOURCC fccType;
FOURCC fccHandler;
DWORD dwFlags;
WORD wPriority;
WORD wLanguage;
DWORD dwInitialFrames;
DWORD dwScale;
DWORD dwRate;
DWORD dwStart;
DWORD dwLength;
DWORD dwSuggestedBufferSize;
DWORD dwQuality;
DWORD dwSampleSize;
struct {
short int left;
short int top;
short int right;
short int bottom;
} rcFrame;
} AVISTREAMHEADER;

dwScale

Used with dwRate to specify the time scale that this stream will use. Dividing dwRate by dwScale gives the number of samples per second. For video streams, this is the frame rate. For audio streams, this rate corresponds to the time needed to play nBlockAlign bytes of audio, which for PCM audio is the just the sample rate.

dwRate

See dwScale.

[smellteen]

这位老兄：

我这样得到信息：

AVIFILEINFO x;
AVIFileInfo(pfile, &x, sizeof(x));

然后做更改
x.dwScale = value;

然后怎么把更改了的信息写回去呀？
用哪个函数？

谢谢。

[smellteen]

AVIFileWriteData
这个么？

该函数第2个参数应该怎么设置，我用了几次都没有达到修改的目的。

[httpaspjspphp]

使文件函数就可以阿