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法学如何使用youtube-dl从YouTube视频下载mp3曲目
从YouTube下载MP3曲目有多种方法，例如Web应用程序、Windows应用程序和Linux中的命令行工具。youtube-DL是市场上最好的下载YouTube音轨工具之一。它是用Python编程语言开发的。该程序几乎可以在所有Linux发行版中使用。如果您从未听说过此工具，那么本文就是为您准备的。
安装youtube-DL
要安装youtube-DL，请使用以下命令：
$ sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
示例输出应如下所示：
--2016-03-08 11:41:21-- https://yt-dl.org/downloads/latest/youtube-dl Resolving yt-dl.org (yt-dl.org)... 95.143.172.170, 2001:1a50:11:0:5f:8f:acaa:177 Connecting to yt-dl.org (yt-dl.org)|95.143.172.170|:443... connected. HTTP request sent, awaiting response... 302 Found Location: https://yt-dl.org/downloads/2016.03.06/youtube-dl [following] --2016-03-08 11:41:23-- https://yt-dl.org/downloads/2016.03.06/youtube-dl Connecting to yt-dl.org (yt-dl.org)|95.143.172.170|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 1133512 (1.1M) [application/octet-stream] Saving to: ‘/usr/local/bin/youtube-dl’ 100%[======================================>] 11,33,512 218KB/s in 6.2s 2016-03-08 11:41:30 (180 KB/s) - ‘/usr/local/bin/youtube-dl’ saved [1133512/1133512]
更改youtube-dl目录权限以访问youtube-dl命令。要更改目录权限，请使用以下命令：
$ sudo chmod a+rx /usr/local/bin/youtube-dl
要获取有关youtube-DL的更多信息，请使用以下命令：
# youtube-dl --help
上述命令需要root权限，其输出应如下所示：
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)
--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
.........................将视频下载为MP3曲目
要将音乐转换为不同的音频格式，youtube-dl需要ffmpeg或avconv及其帮助程序ffprobe或avprobe。
要安装其中一个，请使用以下命令：
$ sudo apt-get install ffmpeg
示例输出应如下所示：
Building dependency tree Reading state information... Done ffmpeg is already the newest version. The following packages were automatically installed and are no longer required: gcc-4.8-base:i386 libasn1-8-heimdal:i386 libasound2:i386 libasound2-plugins:i386 libasyncns0:i386 libavahi-client3:i386 libavahi-common-data:i386 libavahi-common3:i386 libbit-vector-perl libcapi20-3:i386 libcarp-clan-perl libclass-method-modifiers-perl libcups2:i386 libdata-random-perl libdate-calc-perl libdate-calc-xs-perl libdrm-amdgpu1:i386 libdrm-intel1:i386 libdrm-nouveau2:i386 libdrm-radeon1:i386 libedit2:i386 libelf1:i386 libexif12:i386 libexpat1:i386 libffi6:i386 libflac8:i386 libfontconfig1:i386 libfreetype6:i386 libgcrypt11:i386 libgd-perl libgd3:i386 libgif4:i386 libgl1-mesa-dri-lts-wily:i386 libgl1-mesa-glx-lts-wily:i386 libglapi-mesa-lts-wily:i386 libglib2.0-0:i386 libglu1-mesa:i386 libgnome2-gconf-perl libgnutls26:i386 libgpg-error0:i386 libgphoto2-6:i386 libgphoto2-port10:i386 libgssapi-krb5-2:i386 libgssapi3-heimdal:i386 libgstreamer-plugins-base0.10-0:i386 libgstreamer0.10-0:i386 libhcrypto4-heimdal:i386 libheimbase1-heimdal:i386 libheimntlm0-heimdal:i386 libhx509-5-heimdal:i386 libice6:i386 libieee1284-3:i386 ..........................
要下载MP3曲目，请使用以下命令：
$ youtube-dl -x --audio-format mp3 --prefer-ffmpeg https://www.youtube.com/watch?v=jwD4AEVBL6Q
示例输出应如下所示：
[youtube] jwD4AEVBL6Q: Downloading webpage [youtube] jwD4AEVBL6Q: Downloading video info webpage [youtube] jwD4AEVBL6Q: Extracting video information [youtube] jwD4AEVBL6Q: Downloading MPD manifest [download] Destination: Bad Style - Time back-jwD4AEVBL6Q.m4a [download] 100% of 7.45MiB in 00:08 [ffmpeg] Correcting container in "Bad Style - Time back-jwD4AEVBL6Q.m4a" [ffmpeg] Destination: Bad Style - Time back-jwD4AEVBL6Q.mp3 Deleting original file Bad Style - Time back-jwD4AEVBL6Q.m4a (pass -k to keep)
上述命令使用以下两个选项：
–extract-audio (简短选项 -x) – 将视频文件转换为仅音频文件。–audio-format – 指定将下载文件的音频格式。支持的音频格式为“best”、“aac”、“vorbis”、“mp3”、“m4a”、“opus”或“wav”；默认情况下设置为“best”。
从播放列表下载多个文件
要从播放列表下载多个文件，请使用以下命令：
[youtube:playlist] PL9LUD5Kp855InMnKTaRy3LH3kTIYJyBzs: Downloading webpage [download] Downloading playlist: Top Tracks - Imagine Dragons [youtube:playlist] playlist Top Tracks - Imagine Dragons: Downloading 5 videos [download] Downloading video 1 of 5 [youtube] mWRsgZuwf_8: Downloading webpage [youtube] mWRsgZuwf_8: Downloading video info webpage [youtube] mWRsgZuwf_8: Extracting video information [youtube] mWRsgZuwf_8: Downloading js player en_US-vflteKQR7 [youtube] mWRsgZuwf_8: Downloading js player en_US-vflteKQR7 [download] Destination: Imagine Dragons - Demons (Official)-mWRsgZuwf_8.webm [download] 100% of 3.38MiB in 00:06 [ffmpeg] Destination: Imagine Dragons - Demons (Official)-mWRsgZuwf_8.mp3 Deleting original file Imagine Dragons - Demons (Official)-mWRsgZuwf_8.webm (pass -k to keep) [download] Downloading video 2 of 5 [youtube] ktvTqknDobU: Downloading webpage [youtube] ktvTqknDobU: Downloading video info webpage [youtube] ktvTqknDobU: Extracting video information [youtube] ktvTqknDobU: Downloading js player en_US-vflteKQR7 [download] Destination: Imagine Dragons - Radioactive-ktvTqknDobU.webm [download] 100% of 3.81MiB in 00:01 [ffmpeg] Destination: Imagine Dragons - Radioactive-ktvTqknDobU.mp3 Deleting original file Imagine Dragons - Radioactive-ktvTqknDobU.webm (pass -k to keep) [download] Downloading video 3 of 5 [youtube] sENM2wA_FTg: Downloading webpage [youtube] sENM2wA_FTg: Downloading video info webpage [youtube] sENM2wA_FTg: Extracting video information [download] Destination: Imagine Dragons - It's Time-sENM2wA_FTg.webm [download] 100% of 3.81MiB in 00:01 [ffmpeg] Destination: Imagine Dragons - It's Time-sENM2wA_FTg.mp3 Deleting original file Imagine Dragons - It's Time-sENM2wA_FTg.webm (pass -k to keep) [download] Downloading video 4 of 5 [youtube] w5tWYmIOWGk: Downloading webpage [youtube] w5tWYmIOWGk: Downloading video info webpage [youtube] w5tWYmIOWGk: Extracting video information [download] Destination: Imagine Dragons - On Top Of The World (Official Music Video)-w5tWYmIOWGk.webm [download] 100% of 3.92MiB in 00:03 [ffmpeg] Destination: Imagine Dragons - On Top Of The World (Official Music Video)-w5tWYmIOWGk.mp3 Deleting original file Imagine Dragons - On Top Of The World (Official Music Video)-w5tWYmIOWGk.webm (pass -k to keep) [download] Downloading video 5 of 5 [youtube] VP9I8ZUwKpc: Downloading webpage [youtube] VP9I8ZUwKpc: Downloading video info webpage [youtube] VP9I8ZUwKpc: Extracting video information [download] Destination: Imagine Dragons - Warriors (Lyric Video)-VP9I8ZUwKpc.webm [download] 100% of 2.57MiB in 00:01 [ffmpeg] Destination: Imagine Dragons - Warriors (Lyric Video)-VP9I8ZUwKpc.mp3 Deleting original file Imagine Dragons - Warriors (Lyric Video)-VP9I8ZUwKpc.webm (pass -k to keep) [download] Finished downloading playlist: Top Tracks - Imagine Dragons
恭喜！现在，您已经知道“如何使用YouTube-DL从YouTube视频下载MP3曲目”。我们将在下一篇文章中学习更多关于此类Linux命令的内容。继续关注！
更新于：2019年10月21日
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