写这个的原因其实是这几天在看CCTV纪录片《将改革进行到底》，但苦于没有在cctv.com找到超清版地址，就到Youtube.com找一找，结果发现CCTV有发布1080P版，遂尝试利用VPS下载之并记录下来过程。
youtube-dl简介
youtube-dl是一个跨平台的Python命令行程序，用于从YouTube.com等网站下载视频。youtube-dl不仅可以在Unix、Mac OS X上使用，还包含有Windows版可执行exe文件。youtube-dl的源码托管在GitHub上，地址：https://github.com/rg3/youtube-dl
youtube-dl安装
- 由于youtube-dl基于Python编写，故先安装Python。
##安装python
apt-get install python -y
##查看python版本，要求：2.6, 2.7, or 3.2+
python -V
- Youtube上1080P及以上的音视频是分开的，需要用ffmpeg或者avconv合并，在此仅用ffmpeg示例。
#Ubuntu 14.04需要额外添加PPA源才能安装
apt-get install software-properties-common
add-apt-repository ppa:mc3man/trusty-media
apt-get update -y
apt-get dist-upgrade -y
apt-get install ffmpeg -y
#ubuntu 16.04直接安装
apt-get install ffmpeg -y
wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
chmod a+rx /usr/local/bin/youtube-dl
youtube-dl使用
查看使用帮助：
youtube-dl -h
常用参数：
youtube-dl --extractor-descriptions #查看支持网站简介
youtube-dl -U #升级youtube-dl
youtube-dl -F URL #获取所有格式
youtube-dl -F https://www.youtube.com/watch?v=bJIJCz62h-s
[youtube] bJIJCz62h-s: Downloading webpage
[youtube] bJIJCz62h-s: Downloading video info webpage
[youtube] bJIJCz62h-s: Extracting video information
[youtube] bJIJCz62h-s: Downloading MPD manifest
[info] Available formats for bJIJCz62h-s:
format code extension resolution note
139 m4a audio only DASH audio 51k , m4a_dash container, mp4a.40.5@ 48k (22050Hz), 16.65MiB
249 webm audio only DASH audio 54k , opus @ 50k, 16.20MiB
250 webm audio only DASH audio 69k , opus @ 70k, 20.12MiB
171 webm audio only DASH audio 98k , vorbis@128k, 29.78MiB
251 webm audio only DASH audio 126k , opus @160k, 36.60MiB
140 m4a audio only DASH audio 130k , m4a_dash container, mp4a.40.2@128k (44100Hz), 44.45MiB
160 mp4 256x144 DASH video 124k , avc1.4d400c, 25fps, video only, 25.97MiB
278 webm 256x144 144p 133k , webm container, vp9, 25fps, video only, 34.39MiB
133 mp4 426x240 DASH video 290k , avc1.4d4015, 25fps, video only, 73.00MiB
242 webm 426x240 240p 300k , vp9, 25fps, video only, 71.23MiB
243 webm 640x360 360p 578k , vp9, 25fps, video only, 130.93MiB
134 mp4 640x360 DASH video 656k , avc1.4d401e, 25fps, video only, 133.06MiB
244 webm 854x480 480p 1017k , vp9, 25fps, video only, 232.06MiB
135 mp4 854x480 DASH video 1334k , avc1.4d401e, 25fps, video only, 258.69MiB
247 webm 1280x720 720p 2189k , vp9, 25fps, video only, 471.07MiB
136 mp4 1280x720 DASH video 2663k , avc1.4d401f, 25fps, video only, 496.15MiB
248 webm 1920x1080 1080p 3584k , vp9, 25fps, video only, 879.78MiB
137 mp4 1920x1080 DASH video 4412k , avc1.640028, 25fps, video only, 875.47MiB
17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k
36 3gp 320x180 small , mp4v.20.3, mp4a.40.2
43 webm 640x360 medium , vp8.0, vorbis@128k
18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k
22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best)
从1080P及以上的音视频分开了，需要合并成一个文件，youtube-dl自带这个功能只需执行
##youtube-dl -f bestvideo+bestaudio URL 下载最好的视频音频合并
youtube-dl -f best https://www.youtube.com/watch?v=bJIJCz62h-s
##或者
youtube-dl -f bestvideo+bestaudio https://www.youtube.com/watch?v=bJIJCz62h-s
##也可以下载指定id视频音频合并，但是视频id需要在音频id前，如
youtube-dl -f 137+140 https://www.youtube.com/watch?v=bJIJCz62h-s
附所有参数列表：
-h, --help Print this help text and exit
--version Print program version and exit
-U, --update Update this program to latest version. Make
sure that you have sufficient permissions
(run with sudo if needed)
-i, --ignore-errors Continue on download errors, for example to
skip unavailable videos in a playlist
--abort-on-error Abort downloading of further videos (in the
playlist or the command line) if an error
occurs
--dump-user-agent Display the current browser identification
--list-extractors List all supported extractors
--extractor-descriptions Output descriptions of all supported
extractors
--force-generic-extractor Force extraction to use the generic
extractor
--default-search PREFIX Use this prefix for unqualified URLs. For
example "gvsearch2:" downloads two videos
from google videos for youtube-dl "large
apple". Use the value "auto" to let
youtube-dl guess ("auto_warning" to emit a
warning when guessing). "error" just throws
an error. The default value "fixup_error"
repairs broken URLs, but emits an error if
this is not possible instead of searching.
--ignore-config Do not read configuration files. When given
in the global configuration file
/etc/youtube-dl.conf: Do not read the user
configuration in ~/.config/youtube-
dl/config (%APPDATA%/youtube-dl/config.txt
on Windows)
--config-location PATH Location of the configuration file; either
the path to the config or its containing
directory.
--flat-playlist Do not extract the videos of a playlist,
only list them.
--mark-watched Mark videos watched (YouTube only)
--no-mark-watched Do not mark videos watched (YouTube only)
--no-color Do not emit color codes in output
Network Options:
--proxy URL Use the specified HTTP/HTTPS/SOCKS proxy.
To enable experimental SOCKS proxy, specify
a proper scheme. For example
socks5://127.0.0.1:1080/. Pass in an empty
string (--proxy "") for direct connection
--socket-timeout SECONDS Time to wait before giving up, in seconds
--source-address IP Client-side IP address to bind to
-4, --force-ipv4 Make all connections via IPv4
-6, --force-ipv6 Make all connections via IPv6
Geo Restriction:
--geo-verification-proxy URL Use this proxy to verify the IP address for
some geo-restricted sites. The default
proxy specified by --proxy (or none, if the
options is not present) is used for the
actual downloading.
--geo-bypass Bypass geographic restriction via faking
X-Forwarded-For HTTP header (experimental)
--no-geo-bypass Do not bypass geographic restriction via
faking X-Forwarded-For HTTP header
(experimental)
--geo-bypass-country CODE Force bypass geographic restriction with
explicitly provided two-letter ISO 3166-2
country code (experimental)
Video Selection:
--playlist-start NUMBER Playlist video to start at (default is 1)
--playlist-end NUMBER Playlist video to end at (default is last)
--playlist-items ITEM_SPEC Playlist video items to download. Specify
indices of the videos in the playlist
separated by commas like: "--playlist-items
1,2,5,8" if you want to download videos
indexed 1, 2, 5, 8 in the playlist. You can
specify range: "--playlist-items
1-3,7,10-13", it will download the videos
at index 1, 2, 3, 7, 10, 11, 12 and 13.
--match-title REGEX Download only matching titles (regex or
caseless sub-string)
--reject-title REGEX Skip download for matching titles (regex or
caseless sub-string)
--max-downloads NUMBER Abort after downloading NUMBER files
--min-filesize SIZE Do not download any videos smaller than
SIZE (e.g. 50k or 44.6m)
--max-filesize SIZE Do not download any videos larger than SIZE
(e.g. 50k or 44.6m)
--date DATE Download only videos uploaded in this date
--datebefore DATE Download only videos uploaded on or before
this date (i.e. inclusive)
--dateafter DATE Download only videos uploaded on or after
this date (i.e. inclusive)
--min-views COUNT Do not download any videos with less than
COUNT views
--max-views COUNT Do not download any videos with more than
COUNT views
--match-filter FILTER Generic video filter. Specify any key (see
the "OUTPUT TEMPLATE" for a list of
available keys) to match if the key is
present, !key to check if the key is not
present, key > NUMBER (like "comment_count
> 12", also works with >=, <, <=, !=, =) to
compare against a number, key = 'LITERAL'
(like "uploader = 'Mike Smith'", also works
with !=) to match against a string literal
and & to require multiple matches. Values
which are not known are excluded unless you
put a question mark (?) after the operator.
For example, to only match videos that have
been liked more than 100 times and disliked
less than 50 times (or the dislike
functionality is not available at the given
service), but who also have a description,
use --match-filter "like_count > 100 &
dislike_count <? 50 & description" .
--no-playlist Download only the video, if the URL refers
to a video and a playlist.
--yes-playlist Download the playlist, if the URL refers to
a video and a playlist.
--age-limit YEARS Download only videos suitable for the given
age
--download-archive FILE Download only videos not listed in the
archive file. Record the IDs of all
downloaded videos in it.
--include-ads Download advertisements as well
(experimental)
Download Options:
-r, --limit-rate RATE Maximum download rate in bytes per second
(e.g. 50K or 4.2M)
-R, --retries RETRIES Number of retries (default is 10), or
"infinite".
--fragment-retries RETRIES Number of retries for a fragment (default
is 10), or "infinite" (DASH, hlsnative and
ISM)
--skip-unavailable-fragments Skip unavailable fragments (DASH, hlsnative
and ISM)
--abort-on-unavailable-fragment Abort downloading when some fragment is not
available
--keep-fragments Keep downloaded fragments on disk after
downloading is finished; fragments are
erased by default
--buffer-size SIZE Size of download buffer (e.g. 1024 or 16K)
(default is 1024)
--no-resize-buffer Do not automatically adjust the buffer
size. By default, the buffer size is
automatically resized from an initial value
of SIZE.
--playlist-reverse Download playlist videos in reverse order
--playlist-random Download playlist videos in random order
--xattr-set-filesize Set file xattribute ytdl.filesize with
expected file size (experimental)
--hls-prefer-native Use the native HLS downloader instead of
ffmpeg
--hls-prefer-ffmpeg Use ffmpeg instead of the native HLS
downloader
--hls-use-mpegts Use the mpegts container for HLS videos,
allowing to play the video while
downloading (some players may not be able
to play it)
--external-downloader COMMAND Use the specified external downloader.
Currently supports
aria2c,avconv,axel,curl,ffmpeg,httpie,wget
--external-downloader-args ARGS Give these arguments to the external
downloader
Filesystem Options:
-a, --batch-file FILE File containing URLs to download ('-' for
stdin)
--id Use only video ID in file name
-o, --output TEMPLATE Output filename template, see the "OUTPUT
TEMPLATE" for all the info
--autonumber-start NUMBER Specify the start value for %(autonumber)s
(default is 1)
--restrict-filenames Restrict filenames to only ASCII
characters, and avoid "&" and spaces in
filenames
-w, --no-overwrites Do not overwrite files
-c, --continue Force resume of partially downloaded files.
By default, youtube-dl will resume
downloads if possible.
--no-continue Do not resume partially downloaded files
(restart from beginning)
--no-part Do not use .part files - write directly
into output file
--no-mtime Do not use the Last-modified header to set
the file modification time
--write-description Write video description to a .description
file
--write-info-json Write video metadata to a .info.json file
--write-annotations Write video annotations to a
.annotations.xml file
--load-info-json FILE JSON file containing the video information
(created with the "--write-info-json"
option)
--cookies FILE File to read cookies from and dump cookie
jar in
--cache-dir DIR Location in the filesystem where youtube-dl
can store some downloaded information
permanently. By default
$XDG_CACHE_HOME/youtube-dl or
~/.cache/youtube-dl . At the moment, only
YouTube player files (for videos with
obfuscated signatures) are cached, but that
may change.
--no-cache-dir Disable filesystem caching
--rm-cache-dir Delete all filesystem cache files
Thumbnail images:
--write-thumbnail Write thumbnail image to disk
--write-all-thumbnails Write all thumbnail image formats to disk
--list-thumbnails Simulate and list all available thumbnail
formats
Verbosity / Simulation Options:
-q, --quiet Activate quiet mode
--no-warnings Ignore warnings
-s, --simulate Do not download the video and do not write
anything to disk
--skip-download Do not download the video
-g, --get-url Simulate, quiet but print URL
-e, --get-title Simulate, quiet but print title
--get-id Simulate, quiet but print id
--get-thumbnail Simulate, quiet but print thumbnail URL
--get-description Simulate, quiet but print video description
--get-duration Simulate, quiet but print video length
--get-filename Simulate, quiet but print output filename
--get-format Simulate, quiet but print output format
-j, --dump-json Simulate, quiet but print JSON information.
See the "OUTPUT TEMPLATE" for a description
of available keys.
-J, --dump-single-json Simulate, quiet but print JSON information
for each command-line argument. If the URL
refers to a playlist, dump the whole
playlist information in a single line.
--print-json Be quiet and print the video information as
JSON (video is still being downloaded).
--newline Output progress bar as new lines
--no-progress Do not print progress bar
--console-title Display progress in console titlebar
-v, --verbose Print various debugging information
--dump-pages Print downloaded pages encoded using base64
to debug problems (very verbose)
--write-pages Write downloaded intermediary pages to
files in the current directory to debug
problems
--print-traffic Display sent and read HTTP traffic
-C, --call-home Contact the youtube-dl server for debugging
--no-call-home Do NOT contact the youtube-dl server for
debugging
Workarounds:
--encoding ENCODING Force the specified encoding (experimental)
--no-check-certificate Suppress HTTPS certificate validation
--prefer-insecure Use an unencrypted connection to retrieve
information about the video. (Currently
supported only for YouTube)
--user-agent UA Specify a custom user agent
--referer URL Specify a custom referer, use if the video
access is restricted to one domain
--add-header FIELD:VALUE Specify a custom HTTP header and its value,
separated by a colon ':'. You can use this
option multiple times
--bidi-workaround Work around terminals that lack
bidirectional text support. Requires bidiv
or fribidi executable in PATH
--sleep-interval SECONDS Number of seconds to sleep before each
download when used alone or a lower bound
of a range for randomized sleep before each
download (minimum possible number of
seconds to sleep) when used along with
--max-sleep-interval.
--max-sleep-interval SECONDS Upper bound of a range for randomized sleep
before each download (maximum possible
number of seconds to sleep). Must only be
used along with --min-sleep-interval.
Video Format Options:
-f, --format FORMAT Video format code, see the "FORMAT
SELECTION" for all the info
--all-formats Download all available video formats
--prefer-free-formats Prefer free video formats unless a specific
one is requested
-F, --list-formats List all available formats of requested
videos
--youtube-skip-dash-manifest Do not download the DASH manifests and
related data on YouTube videos
--merge-output-format FORMAT If a merge is required (e.g.
bestvideo+bestaudio), output to given
container format. One of mkv, mp4, ogg,
webm, flv. Ignored if no merge is required
Subtitle Options:
--write-sub Write subtitle file
--write-auto-sub Write automatically generated subtitle file
(YouTube only)
--all-subs Download all the available subtitles of the
video
--list-subs List all available subtitles for the video
--sub-format FORMAT Subtitle format, accepts formats
preference, for example: "srt" or
"ass/srt/best"
--sub-lang LANGS Languages of the subtitles to download
(optional) separated by commas, use --list-
subs for available language tags
Authentication Options:
-u, --username USERNAME Login with this account ID
-p, --password PASSWORD Account password. If this option is left
out, youtube-dl will ask interactively.
-2, --twofactor TWOFACTOR Two-factor authentication code
-n, --netrc Use .netrc authentication data
--video-password PASSWORD Video password (vimeo, smotri, youku)
Adobe Pass Options:
--ap-mso MSO Adobe Pass multiple-system operator (TV
provider) identifier, use --ap-list-mso for
a list of available MSOs
--ap-username USERNAME Multiple-system operator account login
--ap-password PASSWORD Multiple-system operator account password.
If this option is left out, youtube-dl will
ask interactively.
--ap-list-mso List all supported multiple-system
operators
Post-processing Options:
-x, --extract-audio Convert video files to audio-only files
(requires ffmpeg or avconv and ffprobe or
avprobe)
--audio-format FORMAT Specify audio format: "best", "aac",
"flac", "mp3", "m4a", "opus", "vorbis", or
"wav"; "best" by default; No effect without
-x
--audio-quality QUALITY Specify ffmpeg/avconv audio quality, insert
a value between 0 (better) and 9 (worse)
for VBR or a specific bitrate like 128K
(default 5)
--recode-video FORMAT Encode the video to another format if
necessary (currently supported:
mp4|flv|ogg|webm|mkv|avi)
--postprocessor-args ARGS Give these arguments to the postprocessor
-k, --keep-video Keep the video file on disk after the post-
processing; the video is erased by default
--no-post-overwrites Do not overwrite post-processed files; the
post-processed files are overwritten by
default
--embed-subs Embed subtitles in the video (only for mp4,
webm and mkv videos)
--embed-thumbnail Embed thumbnail in the audio as cover art
--add-metadata Write metadata to the video file
--metadata-from-title FORMAT Parse additional metadata like song title /
artist from the video title. The format
syntax is the same as --output. Regular
expression with named capture groups may
also be used. The parsed parameters replace
existing values. Example: --metadata-from-
title "%(artist)s - %(title)s" matches a
title like "Coldplay - Paradise". Example
(regex): --metadata-from-title
"(?P<artist>.+?) - (?P<title>.+)"
--xattrs Write metadata to the video file's xattrs
(using dublin core and xdg standards)
--fixup POLICY Automatically correct known faults of the
file. One of never (do nothing), warn (only
emit a warning), detect_or_warn (the
default; fix file if we can, warn
otherwise)
--prefer-avconv Prefer avconv over ffmpeg for running the
postprocessors (default)
--prefer-ffmpeg Prefer ffmpeg over avconv for running the
postprocessors
--ffmpeg-location PATH Location of the ffmpeg/avconv binary;
either the path to the binary or its
containing directory.
--exec CMD Execute a command on the file after
downloading, similar to find's -exec
syntax. Example: --exec 'adb push {}
/sdcard/Music/ && rm {}'
--convert-subs FORMAT Convert the subtitles to other format
(currently supported: srt|ass|vtt)
