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一：打开管理NuGet程序包进行安装NReco.VideoConverter.dll

 

二：实践

        /// <summary>
        /// amr转化为mp3
        /// </summary>
        /// <param name="model"></param>
        public void AmrConvertMp3(PmsProjectFilesModel model)
        {
            if (model.FileType == 2)
            {
                var filePath = Config.FilePath + "\\" + model.FilePath;
                var newFilePath = Config.FilePath + "\\" + model.FilePath.Replace(".amr", ".mp3");

                //万企链传amr,需转化为mp3
                if (".amr".Equals(model.FileExt, StringComparison.OrdinalIgnoreCase))
                {
                    //转MP3
                    if (File.Exists(filePath) && !File.Exists(newFilePath))
                    {
                        CommonMethod.FormatConversion(filePath, "amr", newFilePath, "mp3");
                    }
                }
            }
        }

        /// <summary>
        /// 格式转化
        /// </summary>
        /// <param name="inputFile">源文件路径</param>
        /// <param name="inputFormat">源文件格式</param>
        /// <param name="outFile">转化后文件路径</param>
        /// <param name="outFormat">转化后文件格式</param>
        public static void FormatConversion(string inputFile, string inputFormat, string outFile, string outFormat, int audioSampleRate = 44100)
        {
            try
            {
                new FFMpegConverter().ConvertMedia(inputFile, inputFormat, outFile, outFormat, new ConvertSettings { AudioSampleRate = audioSampleRate });
            }
            catch (Exception ex)
            {
                throw ex;
                // ignored
            }
        }