c#directshow录像压缩

您可以使用 DirectShow 框架中的 AVI 录制器和音频压缩器来进行录像压缩。在录制器和压缩器之间添加一个 MPEG 编码器，可以将录像压缩为 MPEG 格式。以下是大致的代码示例：

// 创建 FilterGraph 对象
FilterGraph graph = new FilterGraph();

// 添加 Capture 录制器
IBaseFilter captureFilter = ... // 获取 Capture 录制器
graph.AddFilter(captureFilter, "Capture Filter");

// 添加 AudioCompressor 音频压缩器
IBaseFilter audioCompressor = ... // 获取音频压缩器
graph.AddFilter(audioCompressor, "Audio Compressor");

// 添加 MPEG 编码器
IBaseFilter mpegEncoder = ... // 获取 MPEG 编码器
graph.AddFilter(mpegEncoder, "MPEG Encoder");

// 连接 Filter
graph.ConnectDirect(GetPin(captureFilter, "Video Output"), GetPin(mpegEncoder, "Input"), null);
graph.ConnectDirect(GetPin(captureFilter, "Audio Output"), GetPin(audioCompressor, "Input"), null);
graph.ConnectDirect(GetPin(audioCompressor, "Output"), GetPin(mpegEncoder, "Audio Input"), null);

// 开始录制
ICaptureGraphBuilder2 builder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();
builder.SetFiltergraph(graph);
builder.SetOutputFileName(MediaSubType.Mpeg1Video, "output.mpg", out IBaseFilter mux, out IFileSinkFilter fileSink);
builder.RenderStream(PinCategory.Preview, MediaType.Video, GetPin(captureFilter, "Video Output"), mpegEncoder, mux);

// 开始预览
IVideoWindow window = (IVideoWindow)graph;
window.put_AutoShow(true);
window.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren | WindowStyle.ClipSiblings);
window.put_MessageDrain(this.Handle);
window.put_WindowState(WindowState.Normal);
window.put_Caption("Preview");
window.put_Left(0);
window.put_Top(0);
window.put_Width(640);
window.put_Height(480);
window.put_Visible(OABool.True);