How to improve my code to make the video quality better?

how to improve my code to make better video quality?

• I am using the following code to leverage Windows Media Encoder to record screen. I am using Windows Vista, screen resolution 1024 × 768， 32-bit. My issue is, the video could be recorded successfully, but when I playback the recorded video, the quality of video is not very good -- e.g. characters are very obscure. I am wondering what are the parameters I should try to tune to get better quality of recorder video? My code, static WMEncoder encoder = new WMEncoder(); IWMEncSourceGroup SrcGrp; IWMEncSourceGroupCollection SrcGrpColl; SrcGrpColl = encoder.SourceGroupCollection; SrcGrp = (IWMEncSourceGroup)SrcGrpColl.Add("SG_1"); IWMEncVideoSource2 SrcVid; SrcVid = (IWMEncVideoSource2)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO); SrcVid.SetInput("ScreenCap://ScreenCapture1", "", ""); IWMEncFile File = encoder.File; File.LocalFileName = "C:\\OutputFile.avi"; // 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; } } encoder.Start(); thanks in advance, George

• Answer:

  Video encoders use a certain kbit/second ratio to limit the size of the generated stream. The fewer kbits/sec the less detail you will get due to fewer coefficients from the DCT and bigger quantization values. In other words: the more kbits/sec you put into the video the more detail can be stored in the stream by the encoder. Judging by your code you have chosen a profile which uses 384 kbit/s which is not very much for a 1024*768 video. You should try other profiles or set bitrate you want yourself.