C#利用OpenCvSharp实现视频抽帧

public async Task<bool> DoFramesCaptureAsync(string videoPath, string savePath)
{
    int interval = 10; // 设置抽帧间隔(单位s)，根据需要调整
    int frameCount = 0;
    int num_count = 0;
    if (videoPath != null && savePath != null)
    {
        VideoCapture videoCapture = new VideoCapture(videoPath);
        var frameRate = Convert.ToInt32(videoCapture.Fps);
        Console.Out.WriteLine($"{DateTime.Now}:【" + videoPath + "】文件抽帧处理（帧率：" + frameRate.ToString() + "/抽帧间隔：" + interval.ToString() + "秒)");
        Console.Out.WriteLine($"{DateTime.Now}:【" + savePath + "】文件保存地址");
        if (!videoCapture.IsOpened())
        {
            videoPath = videoPath.Split('.')[0] + "temp.mp4";
            videoCapture = new VideoCapture(videoPath);
            frameRate = Convert.ToInt32(videoCapture.Fps);
            Console.Out.WriteLine($"{DateTime.Now}:" + "重新尝试");
            Console.Out.WriteLine($"{DateTime.Now}:【" + videoPath + "】文件抽帧处理（帧率：" + frameRate.ToString() + "/抽帧间隔：" + interval.ToString() + "秒)");
            Console.Out.WriteLine($"{DateTime.Now}:【" + savePath + "】文件保存地址");
            if (!videoCapture.IsOpened())
            {
                Console.Out.WriteLine($"{DateTime.Now}:【" + videoPath + "】文件打开失败!");
                return false;
            }
        }
        var totalFrames = videoCapture.FrameCount;

        while (totalFrames >= frameCount)
        {
            Mat processedFrame = new Mat();
            videoCapture.Read(processedFrame);
            try
            {
                Cv2.ImWrite(savePath + num_count.ToString() + "_output_image.jpg", processedFrame);
                processedFrame.Dispose();
                frameCount = frameCount + interval * frameRate;
                videoCapture.PosFrames = frameCount;
                num_count++;

                await Task.Delay(5);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
                return false;
            }
        }
        videoCapture.Dispose();
        return true;
    }
    return false;
}