Execute ffmpeg from unity on MacOS

execute.cs

    // Make sure you have ffmpeg installed at /usr/local/bin/ffmpeg
    
    static void ExecuteProcessTerminal(string inputFileDir)
    {
        try
        {
            var outputFileName = Regex.Replace(inputFileDir, @"\.(mp4|mov|MP4|MOV)", ".wav", RegexOptions.IgnoreCase);
            ProcessStartInfo startInfo = new ProcessStartInfo()
            {
                FileName = "/usr/local/bin/ffmpeg",
                Arguments = $"-y -i {inputFileDir} -async 1 -ac 2 -ar 44100 {outputFileName}", 
                UseShellExecute = false,
                RedirectStandardError = true,
                RedirectStandardInput = true,
                RedirectStandardOutput = true,
                CreateNoWindow = true,
            };
            Process myProcess = new Process
            {
                StartInfo = startInfo
            };
            myProcess.Start();
            string output = myProcess.StandardOutput.ReadToEnd();
            Debug.Log(output);
            myProcess.WaitForExit();
            myProcess.Close();
            
            // callback("file://" + outputFileName, "wav", 1);
        }
        catch (Exception e)
        {
            Debug.LogError(e);
            // callback("", "wav", 0);
        }
    }