在c#中使用ffmpeg遇到问题如何正确地将字符串格式化为高阶视频？

using System.Diagnostics;

Process process = new Process();
process.StartInfo = startInfo;
process.Start();
process.WaitForExit();

using System.Diagnostics;

public class FFmpegConverter
{
    public void ConvertToHighQualityVideo(string inputFilePath, string outputFilePath)
    {
        string ffmpegPath = "ffmpeg.exe"; // FFmpeg可执行文件路径

        string command = $"-i {inputFilePath} -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k -vf scale=1920:1080 {outputFilePath}";

        ProcessStartInfo startInfo = new ProcessStartInfo();
        startInfo.FileName = ffmpegPath;
        startInfo.Arguments = command;
        startInfo.RedirectStandardOutput = true;
        startInfo.RedirectStandardError = true;
        startInfo.UseShellExecute = false;
        startInfo.CreateNoWindow = true;

        Process process = new Process();
        process.StartInfo = startInfo;
        process.Start();
        process.WaitForExit();

        if (process.ExitCode == 0)
        {
            Console.WriteLine("视频转换成功！");
        }
        else
        {
            Console.WriteLine("视频转换失败！");
        }
    }
}