利用Window Media Encoder压缩mpg文件为asf

sdk上的例子，直接上代码

try { // Create a WMEncoder object. WMEncoder Encoder = new WMEncoder(); // Retrieve the source group collection. IWMEncSourceGroupCollection SrcGrpColl = Encoder.SourceGroupCollection; // Add a source group to the collection. IWMEncSourceGroup SrcGrp = SrcGrpColl.Add("SG_1"); // Add a video and audio source to the source group. IWMEncSource SrcAud = SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_AUDIO); SrcAud.SetInput("C://1.mpg", "", ""); IWMEncVideoSource2 SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO); SrcVid.SetInput("C://1.mpg", "", ""); // Crop 2 pixels from each edge of the video image. SrcVid.CroppingBottomMargin = 2; SrcVid.CroppingTopMargin = 2; SrcVid.CroppingLeftMargin = 2; SrcVid.CroppingRightMargin = 2; // Specify a file object in which to save encoded content. IWMEncFile File = Encoder.File; File.LocalFileName = "C://2.asf"; // Choose a profile from the collection. IWMEncProfileCollection ProColl = Encoder.ProfileCollection; IWMEncProfile Pro; for (int i = 0; i < ProColl.Count; i++) { Pro = ProColl.Item(i); if (Pro.Name == "Windows Media Video 8 for Local Area Network (384 Kbps)") { SrcGrp.set_Profile(Pro); break; } } // Fill in the description object members. IWMEncDisplayInfo Descr = Encoder.DisplayInfo; Descr.Author = "Author name"; Descr.Copyright = "Copyright information"; Descr.Description = "Text description of encoded content"; Descr.Rating = "Rating information"; Descr.Title = "Title of encoded content"; // Add an attribute to the collection. IWMEncAttributes Attr = Encoder.Attributes; Attr.Add("URL", "IP address"); // Start the encoding process. // Wait until the encoding process stops before exiting the application. Encoder.PrepareToEncode(true); Encoder.Start(); Console.WriteLine("Press Enter when the file has been encoded."); Console.ReadLine(); // Press Enter after the file has been encoded. } catch (Exception e) { // TODO: Handle exceptions. }