在 Visual Studio 的 NuGet 包管理器控制台上安装 "libvideo" 之后。
并下载 ffmpeg 以合并音频和视频以获得最佳输出。
按照此代码：
using System;
using System.Diagnostics;
using System.IO;
using System.Net;
using VideoLibrary;
namespace you_tube_download
{
class Program
{
static void Main(string[] args)
{
try
{
Console.WriteLine("write url video : ");
string url = Console.ReadLine();
string information = "";
var videos = YouTube.Default.GetAllVideos(url);
int hightaudio = 1;
int hightvideo = 1;
Console.WriteLine("\nlist all format \n");
foreach (var item in videos)//write all file on this url
{
Console.WriteLine(item.Resolution+","+item.Format + "," + item.AudioFormat + "," + item.AudioBitrate + "," + item.ContentLength + "," + item.AdaptiveKind);
if (item.AdaptiveKind.ToString() == "Audio" && item.AudioBitrate > hightaudio)
{
hightaudio = item.AudioBitrate;
information = item.AudioFormat + "," + item.AudioBitrate+","+item.ContentLength;
}
if (item.Resolution > hightvideo)
{
hightvideo = item.Resolution;
}
}
Console.WriteLine("\ndownload high video resolotion {0} and high audio bitrate {1}",hightvideo,hightaudio);
string[] split = information.Split(',');
foreach (var item in videos)//download audio
{
if (split[0]== item.AudioFormat.ToString() && split[1] == item.AudioBitrate.ToString() && split[2] == item.ContentLength.ToString())
{
Console.WriteLine("\ndownload audio with bitrate {0} and size {1}MB",item.AudioBitrate, Math.Round((double)item.ContentLength / 1000000, 2));
downloadbest(item, Directory.GetCurrentDirectory() + "\\file123456798.mp3");
Console.Write("end\n");
}
}
foreach (var item in videos)//download video
{
if (item.Resolution==hightvideo)
{
Console.WriteLine("\ndownload video with Resolution {0} and size {1}MB", item.Resolution, Math.Round((double)item.ContentLength/1000000,2));
downloadbest(item, Directory.GetCurrentDirectory() + "\\file123456798.mp4");
Console.Write("end\n");
break;
}
}
Console.WriteLine("wait for marge");
combine();
File.Delete(Directory.GetCurrentDirectory() + "\\file123456798.mp3");
File.Delete(Directory.GetCurrentDirectory() + "\\file123456798.mp4");
Console.WriteLine("press any key to continue...");
Console.ReadKey();
}
catch (Exception ex)
{
Console.WriteLine("\n\n\n\n" + ex);
Console.ReadKey();
}
Process.Start(Directory.GetCurrentDirectory());
}
static void combine()
{
Process p = new Process();
p.StartInfo.FileName = "ffmpeg.exe";
p.StartInfo.Arguments = "-i \"" + Directory.GetCurrentDirectory() + "\\file123456798.mp4\" -i \"" + Directory.GetCurrentDirectory() + "\\file123456798.mp3\" -preset veryfast \"" + Directory.GetCurrentDirectory() + "\\final.mp4\"";
p.Start();
p.WaitForExit();
}
static void downloadbest(YouTubeVideo y, string patch)
{
int total = 0;
FileStream fs =null;
Stream streamweb = null;
WebResponse w_response = null;
try
{
WebRequest w_request = WebRequest.Create(y.Uri);
if (w_request != null)
{
w_response = w_request.GetResponse();
if (w_response != null)
{
fs = new FileStream(patch, FileMode.Create);
byte[] buffer = new byte[128*1024];
int bytesRead = 0;
streamweb = w_response.GetResponseStream();
Console.WriteLine("Download Started");
do
{
bytesRead = streamweb.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, bytesRead);
total += bytesRead;
Console.Write($"\rDownloading ({Math.Round(((double)total/(int)y.ContentLength) * 100, 2)}%) {total}/{y.ContentLength} ");
} while (bytesRead > 0);
Console.WriteLine("\nDownload Complete");
}
}
}
catch (Exception ex)
{
Console.WriteLine("\n\n\n\n" + ex);
Console.ReadKey();
Process.Start(Directory.GetCurrentDirectory());
}
finally
{
if (w_response != null) w_response.Close();
if (fs != null) fs.Close();
if (streamweb != null) streamweb.Close();
}
}
}
}