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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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namespace DownKyi.Core.FFmpeg
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{
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public static class FFmpegHelper
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{
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private const string Tag = "FFmpegHelper";
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/// <summary>
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/// 合并音频和视频
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/// </summary>
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/// <param name="video1">音频</param>
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/// <param name="video2">视频</param>
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/// <param name="destVideo"></param>
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public static bool MergeVideo(string video1, string video2, string destVideo)
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{
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string param = $"-y -i \"{video1}\" -i \"{video2}\" -acodec copy -vcodec copy -f mp4 \"{destVideo}\"";
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if (video1 == null || !File.Exists(video1))
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{
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param = $"-y -i \"{video2}\" -acodec copy -vcodec copy -f mp4 \"{destVideo}\"";
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}
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if (video2 == null || !File.Exists(video2))
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{
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param = $"-y -i \"{video1}\" -acodec copy -f aac \"{destVideo}\"";
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}
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if (!File.Exists(video1) && !File.Exists(video2)) { return false; }
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// 如果存在
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try { File.Delete(destVideo); }
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catch (IOException e)
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{
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Console.WriteLine("MergeVideo()发生IO异常: {0}", e);
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Logging.LogManager.Error(Tag, e);
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return false;
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}
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ExcuteProcess("ffmpeg.exe", param, null, (s, e) => Console.WriteLine(e.Data));
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try
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{
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if (video1 != null) { File.Delete(video1); }
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if (video2 != null) { File.Delete(video2); }
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}
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catch (IOException e)
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{
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Console.WriteLine("MergeVideo()发生IO异常: {0}", e);
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Logging.LogManager.Error(Tag, e);
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}
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return true;
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}
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/// <summary>
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/// 拼接多个视频
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/// </summary>
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/// <param name="workingDirectory"></param>
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/// <param name="flvFiles"></param>
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/// <param name="destVideo"></param>
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/// <returns></returns>
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public static bool ConcatVideo(string workingDirectory, List<string> flvFiles, string destVideo)
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{
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// contact的文件名，不包含路径
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string concatFileName = Guid.NewGuid().ToString("N") + "_concat.txt";
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try
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{
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string contact = "";
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foreach (string flv in flvFiles)
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{
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contact += $"file '{flv}'\n";
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}
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FileStream fileStream = new FileStream(workingDirectory + "/" + concatFileName, FileMode.Create);
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StreamWriter streamWriter = new StreamWriter(fileStream);
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//开始写入
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streamWriter.Write(contact);
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//清空缓冲区
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streamWriter.Flush();
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//关闭流
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streamWriter.Close();
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fileStream.Close();
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}
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catch (Exception e)
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{
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Console.WriteLine("ConcatVideo()发生异常: {0}", e);
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Logging.LogManager.Error(Tag, e);
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return false;
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}
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// ffmpeg -y -f concat -safe 0 -i filelist.txt -c copy output.mkv
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// 加上-y，表示如果有同名文件，则默认覆盖
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string param = $"-y -f concat -safe 0 -i {concatFileName} -c copy \"{destVideo}\" -y";
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ExcuteProcess("ffmpeg.exe", param, workingDirectory, (s, e) => Console.WriteLine(e.Data));
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// 删除临时文件
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try
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{
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// 删除concat文件
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File.Delete(workingDirectory + "/" + concatFileName);
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foreach (string flv in flvFiles)
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{
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File.Delete(flv);
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}
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}
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catch (Exception e)
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{
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Console.WriteLine("ConcatVideo()发生异常: {0}", e);
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Logging.LogManager.Error(Tag, e);
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}
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return true;
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}
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/// <summary>
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/// 去水印，非常消耗cpu资源
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/// </summary>
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/// <param name="video"></param>
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/// <param name="destVideo"></param>
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/// <param name="x"></param>
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/// <param name="y"></param>
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/// <param name="width"></param>
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/// <param name="height"></param>
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/// <param name="action"></param>
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public static void Delogo(string video, string destVideo, int x, int y, int width, int height, Action<string> action)
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{
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// ffmpeg -y -i "video.mp4" -vf delogo=x=1670:y=50:w=180:h=70:show=1 "delogo.mp4"
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string param = $"-y -i \"{video}\" -vf delogo=x={x}:y={y}:w={width}:h={height}:show=0 \"{destVideo}\" -hide_banner -y";
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ExcuteProcess("ffmpeg.exe", param, null, (s, e) =>
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{
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Console.WriteLine(e.Data);
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action.Invoke(e.Data);
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});
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}
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/// <summary>
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/// 从一个视频中仅提取音频
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/// </summary>
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/// <param name="video">源视频</param>
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/// <param name="audio">目标音频</param>
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/// <param name="action">输出信息</param>
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public static void ExtractAudio(string video, string audio, Action<string> action)
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{
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// 抽取音频命令
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// ffmpeg -i 3.mp4 -vn -y -acodec copy 3.aac
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// ffmpeg -i 3.mp4 -vn -y -acodec copy 3.m4a
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string param = $"-i \"{video}\" -vn -y -acodec copy \"{audio}\" -hide_banner";
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ExcuteProcess("ffmpeg.exe", param,
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null, (s, e) =>
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{
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Console.WriteLine(e.Data);
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action.Invoke(e.Data);
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});
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}
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/// <summary>
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/// 从一个视频中仅提取视频
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/// </summary>
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/// <param name="video">源视频</param>
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/// <param name="destVideo">目标视频</param>
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/// <param name="action">输出信息</param>
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public static void ExtractVideo(string video, string destVideo, Action<string> action)
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{
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// 提取视频 （Extract Video）
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// ffmpeg -i Life.of.Pi.has.subtitles.mkv -vcodec copy –an videoNoAudioSubtitle.mp4
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string param = $"-i \"{video}\" -y -vcodec copy -an \"{destVideo}\" -hide_banner";
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ExcuteProcess("ffmpeg.exe", param,
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null, (s, e) =>
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{
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Console.WriteLine(e.Data);
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action.Invoke(e.Data);
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});
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}
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/// <summary>
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/// 提取视频的帧，输出为图片
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/// </summary>
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/// <param name="video"></param>
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/// <param name="image"></param>
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/// <param name="number"></param>
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public static void ExtractFrame(string video, string image, uint number)
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{
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// 提取帧
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// ffmpeg -i caiyilin.wmv -vframes 1 wm.bmp
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string param = $"-i \"{video}\" -y -vframes {number} \"{image}\"";
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ExcuteProcess("ffmpeg.exe", param, null, (s, e) => Console.WriteLine(e.Data));
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}
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/// <summary>
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/// 执行一个控制台程序
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/// </summary>
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/// <param name="exe">程序名称</param>
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/// <param name="arg">参数</param>
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/// <param name="workingDirectory">工作路径</param>
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/// <param name="output">输出重定向</param>
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private static void ExcuteProcess(string exe, string arg, string workingDirectory, DataReceivedEventHandler output)
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{
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using (var p = new Process())
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{
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p.StartInfo.FileName = exe;
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p.StartInfo.Arguments = arg;
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// 工作目录
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if (workingDirectory != null)
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{
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p.StartInfo.WorkingDirectory = workingDirectory;
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}
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p.StartInfo.UseShellExecute = false; //输出信息重定向
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p.StartInfo.CreateNoWindow = true;
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p.StartInfo.RedirectStandardError = true;
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p.StartInfo.RedirectStandardOutput = true;
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// 将 StandardErrorEncoding 改为 UTF-8 才不会出现中文乱码
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p.StartInfo.StandardOutputEncoding = System.Text.Encoding.UTF8;
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p.StartInfo.StandardErrorEncoding = System.Text.Encoding.UTF8;
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p.OutputDataReceived += output;
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p.ErrorDataReceived += output;
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p.Start(); //启动线程
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p.BeginOutputReadLine();
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p.BeginErrorReadLine();
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p.WaitForExit(); //等待进程结束
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}
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}
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}
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}
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