Question

您是否有一些库可以将屏幕捕获为压缩视频文件或某些可以执行此操作的解决方案？

Answer 1

此代码使用NuGet上提供的SharpAvi。

编辑：仅展示核心功能。前往http://github.com/MathewSachin/Captura获取更多功能，例如捕获点击和击键，混合麦克风和扬声器输出音频， FFMpeg 支持等。

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using SharpAvi;
using SharpAvi.Codecs;
using SharpAvi.Output;
using System.Windows.Forms;

namespace Captura
{
    // Used to Configure the Recorder
    public class RecorderParams
    {
        public RecorderParams(string filename, int FrameRate, FourCC Encoder, int Quality)
        {
            FileName = filename;
            FramesPerSecond = FrameRate;
            Codec = Encoder;
            this.Quality = Quality;

            Height = Screen.PrimaryScreen.Bounds.Height;
            Width = Screen.PrimaryScreen.Bounds.Width;
        }

        string FileName;
        public int FramesPerSecond, Quality;
        FourCC Codec;

        public int Height { get; private set; }
        public int Width { get; private set; }

        public AviWriter CreateAviWriter()
        {
            return new AviWriter(FileName)
            {
                FramesPerSecond = FramesPerSecond,
                EmitIndex1 = true,
            };
        }

        public IAviVideoStream CreateVideoStream(AviWriter writer)
        {
            // Select encoder type based on FOURCC of codec
            if (Codec == KnownFourCCs.Codecs.Uncompressed)
                return writer.AddUncompressedVideoStream(Width, Height);
            else if (Codec == KnownFourCCs.Codecs.MotionJpeg)
                return writer.AddMotionJpegVideoStream(Width, Height, Quality);
            else
            {
                return writer.AddMpeg4VideoStream(Width, Height, (double)writer.FramesPerSecond,
                    // It seems that all tested MPEG-4 VfW codecs ignore the quality affecting parameters passed through VfW API
                    // They only respect the settings from their own configuration dialogs, and Mpeg4VideoEncoder currently has no support for this
                    quality: Quality,
                    codec: Codec,
                    // Most of VfW codecs expect single-threaded use, so we wrap this encoder to special wrapper
                    // Thus all calls to the encoder (including its instantiation) will be invoked on a single thread although encoding (and writing) is performed asynchronously
                    forceSingleThreadedAccess: true);
            }
        }
    }

    public class Recorder : IDisposable
    {
        #region Fields
        AviWriter writer;
        RecorderParams Params;
        IAviVideoStream videoStream;
        Thread screenThread;
        ManualResetEvent stopThread = new ManualResetEvent(false);
        #endregion

        public Recorder(RecorderParams Params)
        {
            this.Params = Params;

            // Create AVI writer and specify FPS
            writer = Params.CreateAviWriter();

            // Create video stream
            videoStream = Params.CreateVideoStream(writer);
            // Set only name. Other properties were when creating stream, 
            // either explicitly by arguments or implicitly by the encoder used
            videoStream.Name = "Captura";

            screenThread = new Thread(RecordScreen)
            {
                Name = typeof(Recorder).Name + ".RecordScreen",
                IsBackground = true
            };

            screenThread.Start();
        }

        public void Dispose()
        {
            stopThread.Set();
            screenThread.Join();

            // Close writer: the remaining data is written to a file and file is closed
            writer.Close();

            stopThread.Dispose();
        }

        void RecordScreen()
        {
            var frameInterval = TimeSpan.FromSeconds(1 / (double)writer.FramesPerSecond);
            var buffer = new byte[Params.Width * Params.Height * 4];
            Task videoWriteTask = null;
            var timeTillNextFrame = TimeSpan.Zero;

            while (!stopThread.WaitOne(timeTillNextFrame))
            {
                var timestamp = DateTime.Now;

                Screenshot(buffer);

                // Wait for the previous frame is written
                videoWriteTask?.Wait();

                // Start asynchronous (encoding and) writing of the new frame
                videoWriteTask = videoStream.WriteFrameAsync(true, buffer, 0, buffer.Length);

                timeTillNextFrame = timestamp + frameInterval - DateTime.Now;
                if (timeTillNextFrame < TimeSpan.Zero)
                    timeTillNextFrame = TimeSpan.Zero;
            }

            // Wait for the last frame is written
            videoWriteTask?.Wait();
        }

        public void Screenshot(byte[] Buffer)
        {
            using (var BMP = new Bitmap(Params.Width, Params.Height))
            {
                using (var g = Graphics.FromImage(BMP))
                {
                    g.CopyFromScreen(Point.Empty, Point.Empty, new Size(Params.Width, Params.Height), CopyPixelOperation.SourceCopy);

                    g.Flush();

                    var bits = BMP.LockBits(new Rectangle(0, 0, Params.Width, Params.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppRgb);
                    Marshal.Copy(bits.Scan0, Buffer, 0, Buffer.Length);
                    BMP.UnlockBits(bits);
                }
            }
        }
    }
}

使用示例

创建控制台应用程序。
添加对System.Drawing和System.Windows.Forms的引用。（如果修改代码，则可以避免使用System.Windows.Forms。
从NuGet安装SharpAvi。

代码：

using Captura;
using System;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            // Using MotionJpeg as Avi encoder,
            // output to 'out.avi' at 10 Frames per second, 70% quality
            var rec = new Recorder(new RecorderParams("out.avi", 10, SharpAvi.KnownFourCCs.Codecs.MotionJpeg, 70));

            Console.WriteLine("Press any key to Stop...");
            Console.ReadKey();

            // Finish Writing
            rec.Dispose();
        }
    }
}

Answer 2

您最好的选择似乎是Windows Media Encoder。

以下是一些链接：

http://www.c-sharpcorner.com/UploadFile/armoghanasif/CaptureDesktopActivities11122005013755AM/CaptureDesktopActivities.aspx

http://www.codeproject.com/KB/audio-video/CaptureScreenAsVideo.aspx

http://mycomponent.blogspot.com/2009/04/capture-screen-activitiesvideo-using.html

如何使用C＃.Net将屏幕捕获为视频？

2 个答案:

使用示例