linux 文字命令列的 youtube-dl

WALALA.....為何有這個指令被收錄在 ubuntu 和 rhel EPEL 的套件內勒！！！

安裝 youtube-dl 工具

mtchang@ ~$ sudo apt-get install youtube-dl
[sudo] password for mtchang:
Reading package lists... Done
Building dependency tree      
Reading state information... Done
The following extra packages will be installed:
  libav-tools libavdevice53 libavfilter3 libbs2b0 libgif4 libquvi-scripts libquvi7 libvdpau1
  mplayer2 rtmpdump
Suggested packages:
  frei0r-plugins nvidia-vdpau-driver vdpau-driver ffmpeg mplayer
The following NEW packages will be installed:
  libav-tools libavdevice53 libavfilter3 libbs2b0 libgif4 libquvi-scripts libquvi7 libvdpau1
  mplayer2 rtmpdump youtube-dl
0 upgraded, 11 newly installed, 0 to remove and 36 not upgraded.
Need to get 4,766 kB of archives.
After this operation, 14.3 MB of additional disk space will be used.
Do you want to continue? [Y/n] y

執行擷取某個影音檔

mtchang@~/Videos$ youtube-dl http://www.youtube.com/watch?v=iV8JDbtXZm4
[youtube] Setting language
[youtube] iV8JDbtXZm4: Downloading webpage
[youtube] iV8JDbtXZm4: Downloading video info webpage
[youtube] iV8JDbtXZm4: Extracting video information
[download] Destination: 〈島嶼天光〉（Island's Sunrise）藝術計劃 太陽花學運歌曲-iV8JDbtXZm4.mp4
[download] 100% of 81.57MiB in 00:09

裡面有個功能是可以將抓下來的影片直接透過後製的轉換程式直接轉換成為 mp3

   Post-processing Options:
              -x, --extract-audio              convert video files to audio-only files
                                               (requires ffmpeg or avconv and ffprobe or
                                               avprobe)
              --audio-format FORMAT            "best", "aac", "vorbis", "mp3", "m4a",
                                               "opus", or "wav"; best by default
              --audio-quality QUALITY          ffmpeg/avconv audio quality specification,
                                               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)
              -k, --keep-video                 keeps 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
                                               videos)
              --add-metadata                   write metadata to the video file
              --xattrs                         write metadata to the video file's xattrs
                                               (using dublin core and xdg standards)
              --prefer-avconv                  Prefer avconv over ffmpeg for running the
                                               postprocessors (default)
              --prefer-ffmpeg                  Prefer ffmpeg over avconv for running the
                                               postprocessors

作者的網站：http://rg3.github.io/youtube-dl/

詳細的文件請參考這裡：http://rg3.github.io/youtube-dl/documentation.html#d1