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
    -i, --ignore-errors        continue on download errors
    -r, --rate-limit LIMIT     maximum download rate (e.g. 50k or 44.6m)
    -R, --retries RETRIES      number of retries (default is 10)
    --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.
    --dump-user-agent          display the current browser identification
    --user-agent UA            specify a custom user agent
    --list-extractors          List all supported extractors and the URLs they
                               would handle

  Video Selection:
    --playlist-start NUMBER    playlist video to start at (default is 1)
    --playlist-end NUMBER      playlist video to end at (default is last)
    --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)

  Filesystem Options:
    -t, --title                use title in file name
    --id                       use video ID in file name
    -l, --literal              [deprecated] alias of --title
    -A, --auto-number          number downloaded files starting from 00000
    -o, --output TEMPLATE      output filename template. Use %(title)s to get
                               the title, %(uploader)s for the uploader name,
                               %(uploader_id)s for the uploader nickname if
                               different, %(autonumber)s to get an automatically

                               incremented number, %(ext)s for the filename
                               extension, %(upload_date)s for the upload date
                               (YYYYMMDD), %(extractor)s for the provider
                               (youtube, metacafe, etc), %(id)s for the video id

                               and %% for a literal percent. Use - to output to
                               stdout. Can also be used to download to a
                               different directory, for example with -o '/my/dow

                               nloads/%(uploader)s/%(title)s-%(id)s.%(ext)s' .
    --autonumber-size NUMBER   Specifies the number of digits in %(autonumber)s
                               when it is present in output filename template or

                               --autonumber option is given
    --restrict-filenames       Restrict filenames to only ASCII characters, and
                               avoid "&" and spaces in filenames
    -a, --batch-file FILE      file containing URLs to download ('-' for stdin)
    -w, --no-overwrites        do not overwrite files
    -c, --continue             resume partially downloaded files
    --no-continue              do not resume partially downloaded files (restart

                               from beginning)
    --cookies FILE             file to read cookies from and dump cookie jar in
    --no-part                  do not use .part files
    --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

  Verbosity / Simulation Options:
    -q, --quiet                activates quiet mode
    -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-thumbnail            simulate, quiet but print thumbnail URL
    --get-description          simulate, quiet but print video description
    --get-filename             simulate, quiet but print output filename
    --get-format               simulate, quiet but print output format
    --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-intermediate-pages  print downloaded pages to debug problems(very
                               verbose)

  Video Format Options:
    -f, --format FORMAT        video format code
    --all-formats              download all available video formats
    --prefer-free-formats      prefer free video formats unless a specific one
                               is requested
    --max-quality FORMAT       highest quality format to download
    -F, --list-formats         list all available formats (currently youtube
                               only)
    --write-sub                write subtitle file (currently youtube only)
    --only-sub                 downloads only the subtitles (no video)
    --all-subs                 downloads all the available subtitles of the
                               video (currently youtube only)
    --list-subs                lists all available subtitles for the video
                               (currently youtube only)
    --sub-format LANG          subtitle format [srt/sbv] (default=srt)
                               (currently youtube only)
    --sub-lang LANG            language of the subtitles to download (optional)
                               use IETF language tags like 'en'

  Authentication Options:
    -u, --username USERNAME    account username
    -p, --password PASSWORD    account password
    -n, --netrc                use .netrc authentication data

  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