如何提高我的代码做出更好的视频质量？ [英] how to improve my code to make better video quality?

问题描述

我使用下面的代码利用Windows Media编码器，记录屏幕。我使用的是Windows Vista，屏幕分辨率1024×768，32位。我的问题是，视频可以成功地记录下来，但是当我播放录制的视频，视频的质量不是很好 - 例如人物都非常模糊。我想知道什么是我应该试着调整获得记录的视频质量更好的参数？

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?

我的代码，

            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();

提前

感谢，
乔治

thanks in advance, George

推荐答案

视频编码器使用某一千比特/秒的比率，以限制所产生的流的大小。的千位较少/秒的较少细节，你会得到由于从DCT更少系数和更大的量化值。换句话说：越千比特/秒的你放入更多细节可以存储由编码器的数据流的视频

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.

由代码判断已选择一个简介它使用384 kbit / s的这是不是很为1024 * 768的视频。你应该尝试你想自己的其他配置文件或设置的比特率。

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.

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