如何把一个AVI转成MPG格式的文件
使用pBuilder-> SetOutputFileName(
&MEDIASUBTYPE_MPEG1Video,//这里好象只能使用MEDIASUBTYPE_Avi和MEDIASUBTYPE_Asf
T2W(szOutFilename),
&pMux,
&pWriter);
不知道如何实现？
望老大们能给我一个简单的Sample Code!
我的信箱:njhjb@hotmail.com
收到结贴，不够补分！
[解决办法]
#include "stdafx.h "
#include "getframe.h "
#include "getframeapi.h "
#include <vfw.h>
BOOL ExtractAVIFrames(CString szFileName)
{
AVIFileInit();
PAVIFILE avi;
int res=AVIFileOpen(&avi, szFileName, OF_READ, NULL);
if (res!=AVIERR_OK)
{
//an error occures
if (avi!=NULL)
AVIFileRelease(avi);
return FALSE;
}
AVIFILEINFO avi_info;
AVIFileInfo(avi, &avi_info, sizeof(AVIFILEINFO));
CString szFileInfo;
szFileInfo.Format( "Dimention: %dx%d\n "
"Length: %d frames\n "
"Max bytes per second: %d\n "
"Samples per second: %d\n "
"Streams: %d\n "
"File Type: %d ", avi_info.dwWidth,
avi_info.dwHeight,
avi_info.dwLength,
avi_info.dwMaxBytesPerSec,
(DWORD) (avi_info.dwRate / avi_info.dwScale),
avi_info.dwStreams,
avi_info.szFileType);
AfxMessageBox(szFileInfo, MB_ICONINFORMATION | MB_OK);
PAVISTREAM pStream;
res=AVIFileGetStream(avi, &pStream, streamtypeVIDEO /*video stream*/,
0 /*first stream*/);
if (res!=AVIERR_OK)
{
if (pStream!=NULL)
AVIStreamRelease(pStream);
AVIFileExit();
return FALSE;
}
//do some task with the stream
int iNumFrames;
int iFirstFrame;
iFirstFrame=AVIStreamStart(pStream);
if (iFirstFrame==-1)
{
//Error getteing the frame inside the stream
if (pStream!=NULL)
AVIStreamRelease(pStream);
AVIFileExit();
return FALSE;
}
iNumFrames=AVIStreamLength(pStream);
if (iNumFrames==-1)
{
//Error getteing the number of frames inside the stream
if (pStream!=NULL)
AVIStreamRelease(pStream);
AVIFileExit();
return FALSE;
}
//getting bitmap from frame
BITMAPINFOHEADER bih;
ZeroMemory(&bih, sizeof(BITMAPINFOHEADER));
bih.biBitCount=24; //24 bit per pixel
bih.biClrImportant=0;
bih.biClrUsed = 0;
bih.biCompression = BI_RGB;
bih.biPlanes = 1;
bih.biSize = 40;
bih.biXPelsPerMeter = 0;
bih.biYPelsPerMeter = 0;
//calculate total size of RGBQUAD scanlines (DWORD aligned)
bih.biSizeImage = (((bih.biWidth * 3) + 3) & 0xFFFC) * bih.biHeight ;
PGETFRAME pFrame;
pFrame=AVIStreamGetFrameOpen(pStream,
NULL/*(BITMAPINFOHEADER*) AVIGETFRAMEF_BESTDISPLAYFMT*/ /*&bih*/);
//Get the first frame
int index=0;
for (int i=iFirstFrame; i <iNumFrames; i++)
{
index= i-iFirstFrame;
BYTE* pDIB = (BYTE*) AVIStreamGetFrame(pFrame, index);
CreateFromPackedDIBPointer(pDIB, index);
}
AVIStreamGetFrameClose(pFrame);
//close the stream after finishing the task
if (pStream!=NULL)
AVIStreamRelease(pStream);
AVIFileExit();
return TRUE;
}
///The only one function that I must describe more about is: CreateFromPackedDIBPointer(). This function takes a pointer returned from AVIStreamGetFrame() function and creates a bitmap from it. As you know, the AVIStreamGetFrame() returns a pointer to DIB information about the frame. We take this pointer and create a bitmap from it.
BOOL CreateFromPackedDIBPointer(LPBYTE pDIB, int iFrame)
{
ASSERT(pDIB!=NULL);
//Creates a full-color (no palette) DIB from a pointer to a
//full-color memory DIB
//get the BitmapInfoHeader
BITMAPINFOHEADER bih;
RtlMoveMemory(&bih.biSize, pDIB, sizeof(BITMAPINFOHEADER));
//now get the bitmap bits
if (bih.biSizeImage < 1)
{
return FALSE;
}
BYTE* Bits=new BYTE[bih.biSizeImage];
RtlMoveMemory(Bits, pDIB + sizeof(BITMAPINFOHEADER), bih.biSizeImage);
//and BitmapInfo variable-length UDT
BYTE memBitmapInfo[40];
RtlMoveMemory(memBitmapInfo, &bih, sizeof(bih));
BITMAPFILEHEADER bfh;
bfh.bfType=19778; //BM header
bfh.bfSize=55 + bih.biSizeImage;
bfh.bfReserved1=0;
bfh.bfReserved2=0;
bfh.bfOffBits=sizeof(BITMAPINFOHEADER) + sizeof(BITMAPFILEHEADER); //54
CString FileName;
FileName.Format( "Frame-%05d.bmp ", iFrame);
FILE* fp=fopen(FileName, "wb ");
if (fp!=NULL)
{
fwrite(&bfh, sizeof(bfh), 1, fp);
fwrite(&memBitmapInfo, sizeof(memBitmapInfo), 1, fp);
fwrite(Bits, bih.biSizeImage, 1, fp);
fclose(fp);
}
else
{
TRACE0(_T( "Error writing the bitmap file "));
return FALSE;
}
delete [] Bits;
return TRUE;
}
给一段AVI变成BMP的源码，道理都差不多。
