ffmpeg视频总帧数获取，取某一帧的图像方法

FFmpeg的Static版本的bin文件夹中只有三个.exe文件，分别是：ffmpeg.exe，ffplay.exe和ffprobe.exe，各功能如下：

ffmpeg.exe：音视频转码、转换器

ffplay.exe：简单的音视频播放器

ffprobe.exe ：多媒体码流分析器

以下实现了基于ffmpeg.exe和ffprobe.exe的视频总帧数获取和取某一帧的图像方法，可根据需求进行扩展。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace VideoCheck
{
    public class CFFmpeg
    {

        string ffmpegPath = ""; 
        string ffprobePath = "";

        
        public CFFmpeg()
        {
            if (System.IntPtr.Size == 4)
            {
                ffmpegPath = Environment.CurrentDirectory + "\\ffmpeg\\x86\\ffmpeg.exe";
                ffprobePath = Environment.CurrentDirectory + "\\ffmpeg\\x86\\ffprobe.exe";
            }
            else if (System.IntPtr.Size == 8)
            {
                ffmpegPath = Environment.CurrentDirectory + "\\ffmpeg\\x64\\ffmpeg.exe";
                ffprobePath = Environment.CurrentDirectory + "\\ffmpeg\\x64\\ffprobe.exe";
            }


     
        }



        const int SW_HIDE = 0;

        [DllImport("user32.dll")]
        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        /// <summary>
        /// 获取视频有效总帧数
        /// </summary>
        /// <param name="videoPath"></param>
        /// <returns></returns>
        public int GetTotalFrameCnt(string videoPath)
        {
            System.Diagnostics.Process process = new System.Diagnostics.Process();
            process.StartInfo = new System.Diagnostics.ProcessStartInfo(ffprobePath);
            process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.UseShellExecute = false;

            //示例：ffprobe - v error - count_frames - select_streams v: 0 - show_entries stream = nb_read_frames - of default = nokey = 1:noprint_wrappers = 1 C: \Users\whf\Desktop\大和路Y430 - Y428.ASF
            string args = " -v error -count_frames -select_streams v:0 -show_entries stream=nb_read_frames -of default=nokey=1:noprint_wrappers=1 " + "\"" + videoPath + "\"";
            process.StartInfo.Arguments = args.Replace("\\", "/");
            try
            {
                process.Start();
                while (process.MainWindowHandle == IntPtr.Zero)
                {
                    process.Refresh();
                }
                ShowWindow(process.MainWindowHandle, SW_HIDE);

                StringBuilder sb = new StringBuilder();
                while (!process.HasExited)
                {
                    sb.Append(process.StandardOutput.ReadToEnd());
                }
                string str = sb.ToString().Trim();
                int num = 0;
                bool ret = int.TryParse(str,out num);
                return num;
            }
            catch (Exception ex)
            {
                return 0;
            }

        }
 

        /// <summary>
        /// 截取视频图片
        /// </summary>
        /// <param name="videoPath">视频路径</param>
        /// <param name="videoFrameIndex">视频帧号</param>
        /// <param name="outImagePath">图像输出路径</param>
        /// <returns></returns>
        public bool CatchImage(string videoPath,int videoFrameIndex, string outImagePath)
        {
            System.Diagnostics.Process process = new System.Diagnostics.Process();
            process.StartInfo = new System.Diagnostics.ProcessStartInfo(ffmpegPath);
            process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
    
            if (File.Exists(outImagePath))
                File.Delete(outImagePath);
            else
            {
                FileInfo fileInfo = new FileInfo(videoPath);
                if (!Directory.Exists(fileInfo.DirectoryName))
                    Directory.CreateDirectory(fileInfo.DirectoryName);
            }

            int sec = (int)(videoFrameIndex / 25.0f);
            //-ss后跟的时间单位为秒 ，放前面可加快速度
            string args = " -y -ss " + sec+ " -i " + "\""+ videoPath +"\""+ " -frames 1 -f image2 " + "\"" + outImagePath+"\"";
            process.StartInfo.Arguments = args.Replace("\\","/");
            try
            {
                process.Start();
                process.WaitForExit();
            }
            catch(Exception ex)
            {
               
                return false;
            };
            if (System.IO.File.Exists(outImagePath))
            {
                return true;
            }
            return false;
        }
    }
}