using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
namespace DownKyi.Core.FFmpeg
{
public static class FFmpegHelper
{
private const string Tag = "FFmpegHelper";
private static readonly bool is64Bit = false;
private static readonly string exec = "";
static FFmpegHelper()
{
is64Bit = IntPtr.Size == 8;
if (is64Bit)
{
exec = Path.Combine(Environment.CurrentDirectory, "ffmpeg.exe");
}
else
{
exec = Path.Combine(Environment.CurrentDirectory, "ffmpeg.exe");
}
}
/// <summary>
/// 合并音频和视频
/// </summary>
/// <param name="video1">音频</param>
/// <param name="video2">视频</param>
/// <param name="destVideo"></param>
public static bool MergeVideo(string video1, string video2, string destVideo)
{
string param = $"-y -i \"{video1}\" -i \"{video2}\" -acodec copy -vcodec copy -f mp4 \"{destVideo}\"";
if (video1 == null || !File.Exists(video1))
{
param = $"-y -i \"{video2}\" -acodec copy -vcodec copy -f mp4 \"{destVideo}\"";
}
if (video2 == null || !File.Exists(video2))
{
param = $"-y -i \"{video1}\" -acodec copy \"{destVideo}\"";
}
if (!File.Exists(video1) && !File.Exists(video2)) { return false; }
// 如果存在
try { File.Delete(destVideo); }
catch (IOException e)
{
Console.WriteLine("MergeVideo()发生IO异常: {0}", e);
Logging.LogManager.Error(Tag, e);
return false;
}
ExcuteProcess(exec, param, null, (s, e) => Console.WriteLine(e.Data));
try
{
if (video1 != null) { File.Delete(video1); }
if (video2 != null) { File.Delete(video2); }
}
catch (IOException e)
{
Console.WriteLine("MergeVideo()发生IO异常: {0}", e);
Logging.LogManager.Error(Tag, e);
}
return true;
}
/// <summary>
/// 拼接多个视频
/// </summary>
/// <param name="workingDirectory"></param>
/// <param name="flvFiles"></param>
/// <param name="destVideo"></param>
/// <returns></returns>
public static bool ConcatVideo(string workingDirectory, List<string> flvFiles, string destVideo)
{
// contact的文件名，不包含路径
string concatFileName = Guid.NewGuid().ToString("N") + "_concat.txt";
try
{
string contact = "";
foreach (string flv in flvFiles)
{
contact += $"file '{flv}'\n";
}
FileStream fileStream = new FileStream(workingDirectory + "/" + concatFileName, FileMode.Create);
StreamWriter streamWriter = new StreamWriter(fileStream);
//开始写入
streamWriter.Write(contact);
//清空缓冲区
streamWriter.Flush();
//关闭流
streamWriter.Close();
fileStream.Close();
}
catch (Exception e)
{
Console.WriteLine("ConcatVideo()发生异常: {0}", e);
Logging.LogManager.Error(Tag, e);
return false;
}
// ffmpeg -y -f concat -safe 0 -i filelist.txt -c copy output.mkv
// 加上-y，表示如果有同名文件，则默认覆盖
string param = $"-y -f concat -safe 0 -i {concatFileName} -c copy \"{destVideo}\" -y";
ExcuteProcess(exec, param, workingDirectory, (s, e) => Console.WriteLine(e.Data));
// 删除临时文件
try
{
// 删除concat文件
File.Delete(workingDirectory + "/" + concatFileName);
foreach (string flv in flvFiles)
{
File.Delete(flv);
}
}
catch (Exception e)
{
Console.WriteLine("ConcatVideo()发生异常: {0}", e);
Logging.LogManager.Error(Tag, e);
}
return true;
}
/// <summary>
/// 去水印，非常消耗cpu资源
/// </summary>
/// <param name="video"></param>
/// <param name="destVideo"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="action"></param>
public static void Delogo(string video, string destVideo, int x, int y, int width, int height, Action<string> action)
{
// ffmpeg -y -i "video.mp4" -vf delogo=x=1670:y=50:w=180:h=70:show=1 "delogo.mp4"
string param = $"-y -i \"{video}\" -vf delogo=x={x}:y={y}:w={width}:h={height}:show=0 \"{destVideo}\" -hide_banner";
ExcuteProcess(exec, param, null, (s, e) =>
{
Console.WriteLine(e.Data);
action.Invoke(e.Data);
});
}
/// <summary>
/// 从一个视频中仅提取音频
/// </summary>
/// <param name="video">源视频</param>
/// <param name="audio">目标音频</param>
/// <param name="action">输出信息</param>
public static void ExtractAudio(string video, string audio, Action<string> action)
{
// 抽取音频命令
// ffmpeg -i 3.mp4 -vn -y -acodec copy 3.aac
// ffmpeg -i 3.mp4 -vn -y -acodec copy 3.m4a
string param = $"-i \"{video}\" -vn -y -acodec copy \"{audio}\" -hide_banner";
ExcuteProcess(exec, param,
null, (s, e) =>
{
Console.WriteLine(e.Data);
action.Invoke(e.Data);
});
}
/// <summary>
/// 从一个视频中仅提取视频
/// </summary>
/// <param name="video">源视频</param>
/// <param name="destVideo">目标视频</param>
/// <param name="action">输出信息</param>
public static void ExtractVideo(string video, string destVideo, Action<string> action)
{
// 提取视频 （Extract Video）
// ffmpeg -i Life.of.Pi.has.subtitles.mkv -vcodec copy –an videoNoAudioSubtitle.mp4
string param = $"-i \"{video}\" -y -vcodec copy -an \"{destVideo}\" -hide_banner";
ExcuteProcess(exec, param,
null, (s, e) =>
{
Console.WriteLine(e.Data);
action.Invoke(e.Data);
});
}
/// <summary>
/// 提取视频的帧，输出为图片
/// </summary>
/// <param name="video"></param>
/// <param name="image"></param>
/// <param name="number"></param>
public static void ExtractFrame(string video, string image, uint number)
{
// 提取帧
// ffmpeg -i caiyilin.wmv -vframes 1 wm.bmp
string param = $"-i \"{video}\" -y -vframes {number} \"{image}\"";
ExcuteProcess(exec, param, null, (s, e) => Console.WriteLine(e.Data));
}
/// <summary>
/// 执行一个控制台程序
/// </summary>
/// <param name="exe">程序名称</param>
/// <param name="arg">参数</param>
/// <param name="workingDirectory">工作路径</param>
/// <param name="output">输出重定向</param>
private static void ExcuteProcess(string exe, string arg, string workingDirectory, DataReceivedEventHandler output)
{
using (var p = new Process())
{
p.StartInfo.FileName = exe;
p.StartInfo.Arguments = arg;
// 工作目录
if (workingDirectory != null)
{
p.StartInfo.WorkingDirectory = workingDirectory;
}
p.StartInfo.UseShellExecute = false; //输出信息重定向
p.StartInfo.CreateNoWindow = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardOutput = true;
// 将 StandardErrorEncoding 改为 UTF-8 才不会出现中文乱码
p.StartInfo.StandardOutputEncoding = System.Text.Encoding.UTF8;
p.StartInfo.StandardErrorEncoding = System.Text.Encoding.UTF8;
p.OutputDataReceived += output;
p.ErrorDataReceived += output;
p.Start(); //启动线程
p.BeginOutputReadLine();
p.BeginErrorReadLine();
p.WaitForExit(); //等待进程结束
}
}
}
}