如何获取YouTube视频的网址以下载它？

Question

我希望我的电脑（也以HD格式）上下载这个视频：http://www.youtube.com/watch?v=d4RiUy23e9s

所以我想的FLV的URL，.AVI，.MP4或任何与wget的或其他的下载管理器下载。 我该怎么做？

我不想通过程序或webtools像keepvids。

Answer 1

使用wget ，以及youtube视频网址，并为1080p附加fmt = 22，720p或fmt = 387

Answer 2

我使用一个名为EmbeddedObjects的Firefox插件，当我在该页面上时，我知道有一些内容需要下载，它将实际的文件作为avi下载到flash文件的后面。

Answer 3

描述你想要的一个帖子：

http://www.kmcgraphics.com/bits-of-code/how-to-get-the-direct-url-path-to-flv-video-files-on-youtube-for-free/

---

编辑：

要获得FLV网址在您的应用程序，请上网： http://geniusofevil.wordpress.com/2009/04/30/howto-get-direct-youtube-video-flv-url/

Answer 4

1.右键点击视频并选择“弹出”。
2.等待视频开始缓冲。
3.右键点击视频并选择'保存视频为'。

Answer 5

试试这个

#!/usr/bin/perl -T 

use strict; 
use warnings; 

# 
## ,:, Download Youtube videos and music using wget 
## Script Name : youtube_wget_video.pl 
## Version  : 0.34 
## Valid from : May 2013 
## OS Support : Linux, Mac OSX, OpenBSD, FreeBSD or any system with perl 
#    `:` 
## Two arguments 
## $1 Youtube URL from the browser 
## $2 prefix to the file name of the video (optional) 
# 

############ options ########################################## 

# Option: what file type do you want to download? The string is used to search 
# in the youtube URL so you can choose mp4, webm, avi or flv. mp4 seems to 
# work on the most players like android, ipod, ipad, iphones, vlc and mplayer. 
my $fileType = "mp4"; 

# Option: what visual resolution or quality do you want to download? List 
# multiple values just in case the highest quality video is not available, the 
# script will look for the next resolution. You can choose "highres" for 4k 
# (4096x2304), "hd1080" for 1080p, "hd720" for 720p, "itag=18" which means 
# standard definition 640x380 and "itag=17" which is mobile resolution 144p 
# (176x144). The script will always prefer to download the highest resolution 
# video format from the list if available. Do not download highres 4k content 
# unless you have a 4k tv. That would just be silly. 
my $resolution = "hd1080,hd720,itag=18"; 

# Option: How many times should the script retry the download if wget fails for 
# any reason? Do not make this too high as a reoccurring error will just hit 
# youtube over and over again. A value of 3 to 10 works well. 
my $retryTimes = 5; 

# Option: do you want the resolution of the video in the file name? zero(0) is 
# no and one(1) is yes. This option simply puts "_hd1080.mp4" or similar at the 
# end of the file name. 
my $resolutionFilename = 0; 

# Option: turn on DEBUG mode. Use this to reverse engineering this code if you are 
# making changes or you are building your own youtube download script. 
my $DEBUG=0; 

################################################################# 

## clear the environment and set our path 
$ENV{ENV} =""; 
$ENV{PATH} = "/bin:/usr/bin:/usr/local/bin"; 

## initialize retry loop and resolution variables 
my $prefix = ""; 
my $retry = 1; 
my $retryCounter = 0; 
my $resFile = "unknown"; 
my $user_url = ""; 
my $user_prefix = ""; 
my $url = ""; 

## collect the URL from the command line argument and untaint the input 
if (defined($ARGV[0])) { 
    chomp($user_url = $ARGV[0]); 
    $url = "$1" if ($user_url =~ m/^([a-zA-Z0-9\-\&\?\=\:\.\/\_]+)$/ or die "\nError: Illegal characters in YouTube URL\n\n"); 
} else { 
    print "\nError: You Must specify a Youtube URL\n\n"; 
    exit; 
} 

## declare the user defined file name prefix if specified and untaint the input 
if (defined($ARGV[1])) { 
    chomp($user_prefix = $ARGV[1]); 
    $prefix = "$1" if ($user_prefix =~ m/^([a-zA-Z0-9\_\-\.\ ]+)$/ or die "\nError: Illegal characters in filename prefix\n\n"); 
} 

## retry getting the video if the script fails for any reason 
while ($retry != 0 && $retryCounter < $retryTimes) { 

## download the html code from the youtube page suppling the page title and the 
## video url. The page title will be used for the local video file name and the 
## url will be sanitized and passed to wget for the download. 
my $html = `wget -Ncq -e convert-links=off --keep-session-cookies --save-cookies /dev/null --no-check-certificate "$url" -O-` or die "\nThere was a problem downloading the HTML file or the video is not open to the public.\n\n"; 

## format the title of the page to use as the file name 
my ($title) = $html =~ m/<title>(.+)<\/title>/si; 
$title =~ s/[^\w\d]+/_/g or die "\nError: title of the HTML page not found. Check the URL.\n\n"; 
$title =~ s/_youtube//ig; 
$title =~ s/^_//ig; 
$title = lc ($title); 
$title =~ s/_amp//ig; 

## collect the URL of the video from the HTML page 
my ($download) = $html =~ /"url_encoded_fmt_stream_map"(.*)/ig; 

# Print all of the separated strings in the HTML page 
print "\n$download\n\n" if ($DEBUG == 1); 

# This is where we look through the HTML code and select the file type and 
# video quality. 
my @urls = split(',', $download); 
OUTERLOOP: 
foreach my $val (@urls) { 
# print "\n$val\n\n"; 

    if ($val =~ /$fileType/) { 
     my @res = split(',', $resolution); 
     foreach my $ress (@res) { 
     if ($val =~ /$ress/) { 
     print "\n\nGOOD\n\n" if ($DEBUG == 1); 
     print "$val\n" if ($DEBUG == 1); 
     $resFile = $ress; 
     $resFile = "sd640" if ($ress =~ /itag=18/); 
     $resFile = "mb144" if ($ress =~ /itag=17/); 
     $download = $val; 
     last OUTERLOOP; 
     } 
     } 
    } 
} 

## clean up the url by translating unicode and removing unwanted strings 
$download =~ s/\:\ \"//; 
$download =~ s/%3A/:/g; 
$download =~ s/%2F/\//g; 
$download =~ s/%3F/\?/g; 
$download =~ s/%3D/\=/g; 
$download =~ s/%252C/%2C/g; 
$download =~ s/%26/\&/g; 
$download =~ s/sig=/signature=/g; 
$download =~ s/\\u0026/\&/g; 
$download =~ s/(type=[^&]+)//g; 
$download =~ s/(fallback_host=[^&]+)//g; 
$download =~ s/(quality=[^&]+)//g; 

## collect the url and sig since the html page randomizes their order 
my ($signature) = $download =~ /(signature=[^&]+)/; 
my ($youtubeurl) = $download =~ /(http?:.+)/; 
$youtubeurl =~ s/&signature.+$//; 

## combine the url and sig in order 
$download = "$youtubeurl\&$signature"; 

## a bit more cleanup as youtube 
$download =~ s/&+/&/g; 
$download =~ s/&itag=\d+&signature=/&signature=/g; 

## combine file variables into the full file name 
my $filename = "unknown"; 
if ($resolutionFilename == 1) { 
    $filename = "$prefix$title\_$resFile.$fileType"; 
    } else { 
    $filename = "$prefix$title.$fileType"; 
} 

## Process check: Are we currently downloading this exact same video? Two of the 
## same wget processes will overwrite themselves and corrupt the video. 
my $running = `ps auwww | grep [w]get | grep -c "$filename"`; 
print "\nNumber of the same wgets running: $running\n" if ($DEBUG == 1); 
if ($running >= 1) 
    { 
    print "\nAlready downloading the same filename, exiting: $filename\n"; 
    exit 0; 
    }; 

## Print the long, sanitized youtube url for testing and debugging 
print "\n$download\n" if ($DEBUG == 1); 

## print the file name of the video collected from the web page title for us to see on the cli 
print "\n Download: $filename\n\n"; 

## Background the script. Use "ps" if you need to look for the process 
## running or use "ls -al" to look at the file size and date. 
fork and exit; 

## Download the video 
system("wget", "-Ncq", "-e", "convert-links=off", "--load-cookies", "/dev/null", "--tries=200", "--timeout=20", "--no-check-certificate", "$download", "-O", "$filename"); 

## Print the error code of wget 
print "  error code: $?\n" if ($DEBUG == 1); 

## Exit Status: Check if the file exists and we received the correct error code 
## from system call. If the download experienced any problems the script will run again and try 
## continue the download till the file is downloaded. 

if($? == 0 && -e "$filename" && ! -z "$filename") 
    { 
     print " Finished: $filename\n\n" if ($DEBUG == 1); 
     $retry = 0; 
    } 
else 
    { 
    print STDERR "\n FAILED: $filename\n\n" if ($DEBUG == 1); 
    $retry = 1; 
    $retryCounter++; 
    sleep $retryCounter; 
    } 
} 

#### EOF #####