C# ffmpeg简单帮助类
需要ffmpeg文件下载方式
可跳转到：C#使用ffmpeg对画面进行旋转
更多命令可参考：https://www.cnblogs.com/zlp520/p/4241088.html
视频添加水印命令参考自：https://www.cnblogs.com/1175429393wljblog/p/11601817.html
该帮助类加入了，截图、获取视频宽高参数、加水印、视频旋转等基本功能。
//添加水印 ffmpeg -i "D:\VideoText\video.mp4" -i "D:\VideoText\water.png" -filter_complex overlay=10:10 "D:\VideoText\videoWater.mp4"
1 public class ffmpegHepler 2 { 3 //ffmpeg执行文件的路径 4 private static string ffmpeg = System.AppDomain.CurrentDomain.BaseDirectory + "ffmpeg\\ffmpeg.exe"; 5 private static int? width; //视频宽度 6 private static int? height; //视频高度 7 8 #region 属性访问 9 /// <summary> 10 /// 获取宽度 11 /// </summary> 12 /// <returns></returns> 13 public static int? GetWidth() 14 { 15 return width; 16 } 17 /// <summary> 18 /// 获取高度 19 /// </summary> 20 /// <returns></returns> 21 public static int? GetHeight() 22 { 23 return height; 24 } 25 #endregion 26 27 #region 从视频画面中截取一帧画面为图片 28 /// <summary> 29 /// 从视频画面中截取一帧画面为图片 30 /// </summary> 31 /// <param name="VideoName">视频文件，绝对路径</param> 32 /// <param name="Width">图片的宽:620</param> 33 /// <param name="Height">图片的长:360</param> 34 /// <param name="CutTimeFrame">开始截取的时间如:"1"【单位秒】</param> 35 /// <param name="PicPath">截图文件的保存路径【含文件名及后缀名】</param> 36 /// <param name="SleepTime">线程挂起等待时间，单位毫秒【默认值是7000】</param> 37 /// <returns>截图成功返回截图路径，失败返回空</returns> 38 public static string GetPicFromVideo(string VideoName, int Width,int Height, string CutTimeFrame,string PicPath,int SleepTime) 39 { 40 //获取视频长宽尺寸 41 GetMovWidthAndHeight(VideoName); 42 if (!string.IsNullOrWhiteSpace(width.ToString())) //说明获取到了视频的长宽参数 43 { 44 int resultWidht; 45 int resultHeight; 46 DealWidthAndHeight(int.Parse(width.ToString()), int.Parse(height.ToString()), Width, Height, out resultWidht, out resultHeight); 47 48 System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo(ffmpeg); 49 startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; 50 startInfo.Arguments = " -i " + VideoName 51 + " -y -f image2 -ss " + CutTimeFrame 52 + " -t 0.001 -s " + resultWidht.ToString() + "*" + resultHeight.ToString() 53 + " " + PicPath; //設定程式執行參數 54 try 55 { 56 System.Diagnostics.Process.Start(startInfo); 57 Thread.Sleep(SleepTime);//线程挂起，等待ffmpeg截图完毕 58 } 59 catch (Exception e) 60 { 61 return e.Message; 62 } 63 64 //返回视频图片完整路径 65 if (System.IO.File.Exists(PicPath)) 66 return PicPath; 67 return ""; 68 } 69 else 70 return ""; 71 } 72 #endregion 73 74 #region 获取视频的帧宽度和帧高度 75 /// <summary> 76 /// 获取视频的帧宽度和帧高度 77 /// </summary> 78 /// <param name="videoFilePath">mov文件的路径</param> 79 /// <returns>null表示获取宽度或高度失败</returns> 80 public static void GetMovWidthAndHeight(string videoFilePath) 81 { 82 width = null; 83 height = null; 84 try 85 { 86 //判断文件是否存在 87 if (File.Exists(videoFilePath)) 88 { 89 string output; 90 string error; 91 //执行命令 92 ExecuteCommand("\"" + ffmpeg + "\"" + " -i " + "\"" + videoFilePath + "\"", out output, out error); 93 94 if (!string.IsNullOrEmpty(error)) 95 { 96 width = null; 97 height = null; 98 99 //通过正则表达式获取信息里面的宽度信息 100 Regex regex = new Regex("(\\d{2,4})x(\\d{2,4})", RegexOptions.Compiled); 101 Match m = regex.Match(error); 102 if (m.Success) 103 { 104 width = int.Parse(m.Groups[1].Value); 105 height = int.Parse(m.Groups[2].Value); 106 } 107 } 108 } 109 } 110 catch (Exception) 111 {} 112 } 113 #endregion 114 115 #region 处理图片宽高比例截图问题 116 /// <summary> 117 /// 处理图片宽高比例截图问题 118 /// </summary> 119 /// <param name="videoWidht">304</param> 120 /// <param name="videoHeight">640</param> 121 /// <param name="imgWidth">640</param> 122 /// <param name="imgHeight">360</param> 123 /// <param name="width">最终处理的图片宽</param> 124 /// <param name="height">最终处理的图片高</param> 125 private static void DealWidthAndHeight(int videoWidht,int videoHeight,int imgWidth,int imgHeight,out int width, out int height) 126 { 127 if (videoWidht < videoHeight) //说明是竖屏拍摄 128 { 129 if (imgWidth > videoWidht) 130 width = videoWidht; 131 else 132 width = imgWidth; 133 height = videoHeight; 134 } 135 else //说明是横屏拍摄 136 { 137 if (imgHeight > videoHeight) 138 height = videoHeight; 139 else 140 height = imgHeight; 141 width = videoWidht; 142 } 143 } 144 #endregion 145 146 #region 视频旋转 147 /// <summary> 148 /// 视频旋转 149 /// </summary> 150 /// <param name="videoFilePath">视频绝对路径</param> 151 /// <param name="dealVideFilePath">视频旋转后保存路径</param> 152 /// <param name="flag">1=顺时针旋转90度 2=逆时针旋转90度</param> 153 /// <returns>true 成功 false 失败</returns> 154 public static bool VideoRotate(string videoFilePath,string dealVideFilePath,string flag) 155 { 156 //ffmpeg -i success.mp4 -metadata:s:v rotate="90" -codec copy output_success.mp4 157 string output; 158 string error; 159 //执行命令 160 ExecuteCommand("\"" + ffmpeg + "\"" + " -y -i " + "\"" + videoFilePath + "\"" + " -vf transpose=" + flag + " -acodec copy " + "\"" + dealVideFilePath + "\"", out output, out error); 161 if (File.Exists(dealVideFilePath)) 162 return true; 163 else 164 return false; 165 } 166 #endregion 167 168 #region 给视频添加水印 169 /// <summary> 170 /// 给视频添加水印 171 /// </summary> 172 /// <param name="videoFilePath">原视频位置</param> 173 /// <param name="dealVideFilePath">处理后的视频位置</param> 174 /// <param name="waterPicPath">水印图片</param> 175 /// <param name="location">水印距离视频的左上角坐标比如： 10:10</param> 176 /// <returns></returns> 177 public static bool VideoWaterMark(string videoFilePath, string dealVideFilePath,string waterPicPath,string location) 178 { 179 //ffmpeg -i success.mp4 -metadata:s:v rotate="90" -codec copy output_success.mp4 180 string output; 181 string error; 182 //执行命令 183 ExecuteCommand("\"" + ffmpeg + "\"" + " -i " + "\"" + videoFilePath + "\"" + " -i " + "\"" + waterPicPath + "\"" + " -filter_complex overlay=" + location + " \"" + dealVideFilePath + "\"", out output, out error); 184 if (File.Exists(dealVideFilePath)) 185 return true; 186 else 187 return false; 188 } 189 #endregion 190 191 #region 让ffmpeg执行一条命令 192 /// <summary> 193 /// 让ffmpeg执行一条command命令 194 /// </summary> 195 /// <param name="command">需要执行的Command</param> 196 /// <param name="output">输出</param> 197 /// <param name="error">错误</param> 198 private static void ExecuteCommand(string command, out string output, out string error) 199 { 200 try 201 { 202 //创建一个进程 203 Process pc = new Process(); 204 pc.StartInfo.FileName = command; 205 pc.StartInfo.UseShellExecute = false; 206 pc.StartInfo.RedirectStandardOutput = true; 207 pc.StartInfo.RedirectStandardError = true; 208 pc.StartInfo.CreateNoWindow = true; 209 210 //启动进程 211 pc.Start(); 212 213 //准备读出输出流和错误流 214 string outputData = string.Empty; 215 string errorData = string.Empty; 216 pc.BeginOutputReadLine(); 217 pc.BeginErrorReadLine(); 218 219 pc.OutputDataReceived += (ss, ee) => 220 { 221 outputData += ee.Data; 222 }; 223 224 pc.ErrorDataReceived += (ss, ee) => 225 { 226 errorData += ee.Data; 227 }; 228 229 //等待退出 230 pc.WaitForExit(); 231 232 //关闭进程 233 pc.Close(); 234 235 //返回流结果 236 output = outputData; 237 error = errorData; 238 } 239 catch (Exception ex) 240 { 241 output = null; 242 error = null; 243 } 244 } 245 #endregion 246 }
