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             下載影片的方法巿很多種,,而個人比較推薦的是利用Python 語言所開發的youtube-dl, 這是一個在命令列操作的軟體， 使用方法很簡單，只要輸入youtube-dl  URL 即可下載檔案，而需要圖形介面的使用者可下載Youtube-dlG,它是利用wxPython開發可跨平臺的 youtube-dlG (youtube-dl-gui) 當做 youtube-dl 的前端圖形操作界面

如讀者的系統為Windows 則直接下載執行檔即可使用，而Liunx 使用者要準備好Python，WxPython軟體安裝，要按照安裝程序準備安執行環境。

youtube-dl有很多參數可以使用，底下列出HELP的參數：

Usage: youtube-dl-script.py [OPTIONS] URL [URL...]
 
Options:
  General Options:
    -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
                                     help for -o 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 --output 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, the parsed
                                     parameters replace existing values.
                                     Additional templates: %(album)s,
                                     %(artist)s. Example: --metadata-from-title
                                     "%(artist)s - %(title)s" matches a title
                                     like "Coldplay - Paradise"
    --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)
#-------------------------------------------------

註:據說 Youtube 連結網址如果有「&」的話會導致下載失敗，可以前後用雙引號包起來就可以解決這個問題

 

官方網址及下載點(youtube-dl持續更新版本,請下載最新版本,目前為2017.05.01)

安裝步驟

在windows 下，如下載youtube-dl-2017.05.01.exe,則直接執行即可，
如為youtube-dl-2017.05.01.zip, 則要解開ZIP檔案後，找到setup.py, 然後執行 
python setup.py install 
最後執行完畢後會在 E:\XX\APP\Scripts 下新增 youtube-dl.exe 

 

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