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據我previous post我曾嘗試使用sampleGrabber將抓住從視頻文件的幀,然後調用回調函數:如何使用Directshow和C#進行文本覆蓋視頻錄製?
Type comType = Type.GetTypeFromCLSID(new Guid("e436ebb3-524f-11ce-9f53-0020af0ba770"));
IGraphBuilder graphBuilder = (IGraphBuilder)Activator.CreateInstance(comType);
comType = Type.GetTypeFromCLSID(new Guid("C1F400A0-3F08-11d3-9F0B-006008039E37"));
ISampleGrabber sampleGrabber = (ISampleGrabber)Activator.CreateInstance(comType);
graphBuilder.AddFilter((IBaseFilter)sampleGrabber, "samplegrabber");
AMMediaType mediaType = new AMMediaType();
mediaType.majorType = MediaType.Video;
mediaType.subType = MediaSubType.RGB24;
mediaType.formatType = FormatType.VideoInfo;
sampleGrabber.SetMediaType(mediaType);
int hr = graphBuilder.RenderFile(@"D:\test.wmv", null);
IMediaEventEx mediaEvent = (IMediaEventEx)graphBuilder;
IMediaControl mediaControl = (IMediaControl)graphBuilder;
IVideoWindow videoWindow = (IVideoWindow)graphBuilder;
IBasicAudio basicAudio = (IBasicAudio)graphBuilder;
videoWindow.put_AutoShow(OABool.False);
basicAudio.put_Volume(-10000);
sampleGrabber.SetOneShot(false);
sampleGrabber.SetBufferSamples(true);
//the same object has implemented the ISampleGrabberCB interface.
//0 sets the callback to the ISampleGrabberCB::SampleCB() method.
sampleGrabber.SetCallback(this, 0);
mediaControl.Run();
EventCode eventCode;
mediaEvent.WaitForCompletion(-1, out eventCode);
Marshal.ReleaseComObject(sampleGrabber);
Marshal.ReleaseComObject(graphBuilder);
回調函數
public int SampleCB (double sampleTime, IMediaSample mediaSample)
{
//WHAT TO DO HERE.
}
什麼我在回調函數中添加疊加在每一幀,然後整個視頻將獲得疊加文本的商店?
有什麼辦法來添加視頻時錄製疊加文本?
我想跟DMO一起去看你有的任何示例代碼嗎?我正在使用[this](http://stackoverflow.com/questions/10847477/text-overlay-when-video-is-recording-using-directshow-and-c-sharp)錄製代碼?至少給出步驟?感謝您的回覆.. – Amogh
在DirectShowNet示例中有一個Video-Dmo示例:DMOFlip [鏈接](http://directshownet.sourceforge.net/about.html)。這應該是一個很好的起點,因爲這個示例還包含一個幫助文件如何編寫一個dmo。 – CPlusSharp
謝謝你這麼多先生,我會通過該示例感謝。 – Amogh