DirectShow Des Avi视频编辑

不知道lz是否了解avi文件的格式。了解到话就好办了。
每个avi文件都有一个头，先要把头写好，然后再把各个avi文件里的数据读出来，写到头后面就可以了。
如果你还不太明白的话就去看看avi文件的格式。
写avi文件的代码网上应该也有很多，可以下载下来参考一下。

参考下DShow里面des部分的内容，里面有一些合并多个视频的内容，还有视频间切换的方法。不想看英文的话，可以参考下陆其明那本书。应该有点帮助。

可以看看dshow 的sample里的TimelineTest工程
贴部分代码如下int TimelineTest( )
{
    USES_CONVERSION;
    HRESULT hr;    // use the ATL libraries to do automatic reference counting on pointers
    //
    CComPtr< IRenderEngine >  pRenderEngine;
    CComPtr< IGraphBuilder >  pGraph;
    CComPtr< IVideoWindow >   pVidWindow;
    CComPtr< IMediaEvent >    pEvent;
    CComPtr< IAMTimeline >    pTimeline;
    CComPtr< IAMTimelineObj > pVideoGroupObj;
    CComPtr< IAMTimelineObj > pAudioGroupObj;
    CComPtr< IMediaControl >  pControl;
    CComPtr< IMediaSeeking >  pSeeking;    //--------------------------------------------
    // make the timeline
    //--------------------------------------------    hr = CoCreateInstance(
                         CLSID_AMTimeline,
                         NULL,
                         CLSCTX_INPROC_SERVER,
                         IID_IAMTimeline,
                         (void**) &pTimeline
                         );    if(FAILED( hr )) {
        Err(_T("Could not create timeline"));
        return hr;
    }    //--------------------------------------------
    // make the root group/composition
    //--------------------------------------------    hr = pTimeline->CreateEmptyNode( &pVideoGroupObj, TIMELINE_MAJOR_TYPE_GROUP );
    if(FAILED( hr ))
    {
        Err(_T("Could not create empty node"));
        return hr;
    }    CComQIPtr< IAMTimelineGroup, &IID_IAMTimelineGroup > pVideoGroup( pVideoGroupObj );
    CMediaType VideoGroupType;    // all we set is the major type. The group will automatically use other defaults
    VideoGroupType.SetType( &MEDIATYPE_Video );
    hr = pVideoGroup->SetMediaType( &VideoGroupType );
    if(FAILED( hr ))
    {
        Err(_T("Could not set media type"));
        return hr;
    }    //--------------------------------------------
    // add the group to the timeline
    //--------------------------------------------    hr = pTimeline->AddGroup( pVideoGroupObj );
    if(FAILED( hr ))
    {
        Err(_T("Could not add video group"));
        return hr;
    }    //--------------------------------------------
    // make a track
    //--------------------------------------------    CComPtr< IAMTimelineObj > pTrack1Obj;
    hr = pTimeline->CreateEmptyNode( &pTrack1Obj, TIMELINE_MAJOR_TYPE_TRACK );
    if(FAILED( hr ))
    {
        Err(_T("Could not create empty track"));
        return hr;
    }    //--------------------------------------------
    // tell the composition about the track
    //--------------------------------------------    CComQIPtr< IAMTimelineComp, &IID_IAMTimelineComp > pRootComp( pVideoGroupObj );
    hr = pRootComp->VTrackInsBefore( pTrack1Obj, -1 );
    if(FAILED( hr ))
    {
        Err(_T("Could not insert track"));
        return hr;
    }    //--------------------------------------------
    // create a source from 0 to 8 seconds
    //--------------------------------------------    REFERENCE_TIME TLStart = 0 * UNITS;
    REFERENCE_TIME TLStop = 8 * UNITS;    // you can set these if you want to other numbers, and the video will
    // speed up or slow down if the duration isn't the same as the timeline's.
    REFERENCE_TIME MediaStart = 0 * UNITS;
    REFERENCE_TIME MediaStop = 8 * UNITS;    // Search around for directory of media files
    TCHAR tBasePath[MAX_PATH] = {0};
    TCHAR* strLastSlash = NULL;
    GetModuleFileName( NULL, tBasePath, MAX_PATH );
    tBasePath[MAX_PATH-1]=0;
    strLastSlash = _tcsrchr( tBasePath, TEXT('\\') );
    if( strLastSlash )
        *strLastSlash = 0;    WCHAR pClipname[_MAX_PATH+_MAX_PATH+2];   // make room for both the strings    (void)StringCchCopyW( pClipname, NUMELMS(pClipname),T2W( tBasePath ) );
    (void)StringCchCatW( pClipname, NUMELMS(pClipname),L"\\" );
    (void)StringCchCatW( pClipname, NUMELMS(pClipname),wszVideo1Name );    // Make sure that this file exists
    DWORD dwAttr = GetFileAttributesW(pClipname);
    if(dwAttr == (DWORD) -1)
    {
        (void)StringCchCopyW( pClipname,NUMELMS(pClipname), T2W( tBasePath ) );
        (void)StringCchCatW( pClipname,NUMELMS(pClipname), L"\\..\\" );
        (void)StringCchCatW( pClipname,NUMELMS(pClipname), wszVideo1Name );
        dwAttr = GetFileAttributesW(pClipname);
        if(dwAttr == (DWORD) -1)
        {
            (void)StringCchCopyW( pClipname,NUMELMS(pClipname), T2W( tBasePath ) );
            (void)StringCchCatW( pClipname,NUMELMS(pClipname), L"\\..\\..\\" );
            (void)StringCchCatW( pClipname,NUMELMS(pClipname), wszVideo1Name );
            dwAttr = GetFileAttributesW(pClipname);
            if(dwAttr == (DWORD) -1)
            {
                (void)StringCchCopyW( pClipname,NUMELMS(pClipname), T2W( tBasePath ) );
                (void)StringCchCatW( pClipname,NUMELMS(pClipname), L"\\..\\Editing\\TimelineTest\\" );
                (void)StringCchCatW( pClipname,NUMELMS(pClipname), wszVideo1Name );
            }
        }
    }
    WCHAR* strLastSlashW = wcsrchr( pClipname, L'\\' );
    if( strLastSlashW )
        *strLastSlashW = 0;
    (void)StringCchCopy( tBasePath, NUMELMS(tBasePath), W2T(pClipname)  );    (void)StringCchCopyW( pClipname, NUMELMS(pClipname),T2W( tBasePath ) );
    (void)StringCchCatW( pClipname, NUMELMS(pClipname),L"\\" );
    (void)StringCchCatW( pClipname, NUMELMS(pClipname),wszVideo1Name );    // create the timeline source
    //
    CComPtr<IAMTimelineObj> pSource1Obj;
    hr = pTimeline->CreateEmptyNode( &pSource1Obj, TIMELINE_MAJOR_TYPE_SOURCE );
    if(FAILED( hr ))
    {
        Err(_T("Could not create the timeline source"));
        return hr;
    }    // set up source right
    //
    hr = pSource1Obj->SetStartStop( TLStart, TLStop );
    CComQIPtr< IAMTimelineSrc, &IID_IAMTimelineSrc > pSource1Src( pSource1Obj );    hr |= pSource1Src->SetMediaTimes( MediaStart, MediaStop );
    hr |= pSource1Src->SetMediaName( pClipname );
    if(FAILED( hr ))
    {
        Err(_T("Could not configure media source"));
        return E_FAIL;
    }    //--------------------------------------------
    // tell the track about the source
    //--------------------------------------------    CComQIPtr< IAMTimelineTrack, &IID_IAMTimelineTrack > pTrack1( pTrack1Obj );
    hr = pTrack1->SrcAdd( pSource1Obj );
    if(FAILED( hr ))
    {
        Err(_T("Could not add source to track"));
        return hr;
    }

调试易

DirectShow Des Avi视频编辑

解决方案 »