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  1. youtube-dl - download videos from youtube.com or other video platforms
  2. # SYNOPSIS
  3. **youtube-dl** [OPTIONS] URL [URL...]
  4. # INSTALLATION
  5. To install it right away for all UNIX users (Linux, OS X, etc.), type:
  6. sudo curl https://yt-dl.org/latest/youtube-dl -o /usr/local/bin/youtube-dl
  7. sudo chmod a+x /usr/local/bin/youtube-dl
  8. If you do not have curl, you can alternatively use a recent wget:
  9. sudo wget https://yt-dl.org/downloads/latest/youtube-dl -O /usr/local/bin/youtube-dl
  10. sudo chmod a+x /usr/local/bin/youtube-dl
  11. Windows users can [download a .exe file](https://yt-dl.org/latest/youtube-dl.exe) and place it in their home directory or any other location on their [PATH](http://en.wikipedia.org/wiki/PATH_%28variable%29).
  12. OS X users can install **youtube-dl** with [Homebrew](http://brew.sh/).
  13. brew install youtube-dl
  14. You can also use pip:
  15. sudo pip install youtube-dl
  16. Alternatively, refer to the developer instructions below for how to check out and work with the git repository. For further options, including PGP signatures, see https://rg3.github.io/youtube-dl/download.html .
  17. # DESCRIPTION
  18. **youtube-dl** is a small command-line program to download videos from
  19. YouTube.com and a few more sites. It requires the Python interpreter, version
  20. 2.6, 2.7, or 3.2+, and it is not platform specific. It should work on
  21. your Unix box, on Windows or on Mac OS X. It is released to the public domain,
  22. which means you can modify it, redistribute it or use it however you like.
  23. # OPTIONS
  24. -h, --help print this help text and exit
  25. --version print program version and exit
  26. -U, --update update this program to latest version. Make
  27. sure that you have sufficient permissions
  28. (run with sudo if needed)
  29. -i, --ignore-errors continue on download errors, for example to
  30. skip unavailable videos in a playlist
  31. --abort-on-error Abort downloading of further videos (in the
  32. playlist or the command line) if an error
  33. occurs
  34. --dump-user-agent display the current browser identification
  35. --list-extractors List all supported extractors and the URLs
  36. they would handle
  37. --extractor-descriptions Output descriptions of all supported
  38. extractors
  39. --proxy URL Use the specified HTTP/HTTPS proxy. Pass in
  40. an empty string (--proxy "") for direct
  41. connection
  42. --socket-timeout None Time to wait before giving up, in seconds
  43. --default-search PREFIX Use this prefix for unqualified URLs. For
  44. example "gvsearch2:" downloads two videos
  45. from google videos for youtube-dl "large
  46. apple". Use the value "auto" to let
  47. youtube-dl guess ("auto_warning" to emit a
  48. warning when guessing). "error" just throws
  49. an error. The default value "fixup_error"
  50. repairs broken URLs, but emits an error if
  51. this is not possible instead of searching.
  52. --ignore-config Do not read configuration files. When given
  53. in the global configuration file /etc
  54. /youtube-dl.conf: Do not read the user
  55. configuration in ~/.config/youtube-
  56. dl/config (%APPDATA%/youtube-dl/config.txt
  57. on Windows)
  58. --flat-playlist Do not extract the videos of a playlist,
  59. only list them.
  60. ## Video Selection:
  61. --playlist-start NUMBER playlist video to start at (default is 1)
  62. --playlist-end NUMBER playlist video to end at (default is last)
  63. --match-title REGEX download only matching titles (regex or
  64. caseless sub-string)
  65. --reject-title REGEX skip download for matching titles (regex or
  66. caseless sub-string)
  67. --max-downloads NUMBER Abort after downloading NUMBER files
  68. --min-filesize SIZE Do not download any videos smaller than
  69. SIZE (e.g. 50k or 44.6m)
  70. --max-filesize SIZE Do not download any videos larger than SIZE
  71. (e.g. 50k or 44.6m)
  72. --date DATE download only videos uploaded in this date
  73. --datebefore DATE download only videos uploaded on or before
  74. this date (i.e. inclusive)
  75. --dateafter DATE download only videos uploaded on or after
  76. this date (i.e. inclusive)
  77. --min-views COUNT Do not download any videos with less than
  78. COUNT views
  79. --max-views COUNT Do not download any videos with more than
  80. COUNT views
  81. --no-playlist If the URL refers to a video and a
  82. playlist, download only the video.
  83. --age-limit YEARS download only videos suitable for the given
  84. age
  85. --download-archive FILE Download only videos not listed in the
  86. archive file. Record the IDs of all
  87. downloaded videos in it.
  88. --include-ads Download advertisements as well
  89. (experimental)
  90. ## Download Options:
  91. -r, --rate-limit LIMIT maximum download rate in bytes per second
  92. (e.g. 50K or 4.2M)
  93. -R, --retries RETRIES number of retries (default is 10)
  94. --buffer-size SIZE size of download buffer (e.g. 1024 or 16K)
  95. (default is 1024)
  96. --no-resize-buffer do not automatically adjust the buffer
  97. size. By default, the buffer size is
  98. automatically resized from an initial value
  99. of SIZE.
  100. ## Filesystem Options:
  101. -a, --batch-file FILE file containing URLs to download ('-' for
  102. stdin)
  103. --id use only video ID in file name
  104. -A, --auto-number number downloaded files starting from 00000
  105. -o, --output TEMPLATE output filename template. Use %(title)s to
  106. get the title, %(uploader)s for the
  107. uploader name, %(uploader_id)s for the
  108. uploader nickname if different,
  109. %(autonumber)s to get an automatically
  110. incremented number, %(ext)s for the
  111. filename extension, %(format)s for the
  112. format description (like "22 - 1280x720" or
  113. "HD"), %(format_id)s for the unique id of
  114. the format (like Youtube's itags: "137"),
  115. %(upload_date)s for the upload date
  116. (YYYYMMDD), %(extractor)s for the provider
  117. (youtube, metacafe, etc), %(id)s for the
  118. video id, %(playlist_title)s,
  119. %(playlist_id)s, or %(playlist)s (=title if
  120. present, ID otherwise) for the playlist the
  121. video is in, %(playlist_index)s for the
  122. position in the playlist. %(height)s and
  123. %(width)s for the width and height of the
  124. video format. %(resolution)s for a textual
  125. description of the resolution of the video
  126. format. %% for a literal percent. Use - to
  127. output to stdout. Can also be used to
  128. download to a different directory, for
  129. example with -o '/my/downloads/%(uploader)s
  130. /%(title)s-%(id)s.%(ext)s' .
  131. --autonumber-size NUMBER Specifies the number of digits in
  132. %(autonumber)s when it is present in output
  133. filename template or --auto-number option
  134. is given
  135. --restrict-filenames Restrict filenames to only ASCII
  136. characters, and avoid "&" and spaces in
  137. filenames
  138. -t, --title [deprecated] use title in file name
  139. (default)
  140. -l, --literal [deprecated] alias of --title
  141. -w, --no-overwrites do not overwrite files
  142. -c, --continue force resume of partially downloaded files.
  143. By default, youtube-dl will resume
  144. downloads if possible.
  145. --no-continue do not resume partially downloaded files
  146. (restart from beginning)
  147. --no-part do not use .part files - write directly
  148. into output file
  149. --no-mtime do not use the Last-modified header to set
  150. the file modification time
  151. --write-description write video description to a .description
  152. file
  153. --write-info-json write video metadata to a .info.json file
  154. --write-annotations write video annotations to a .annotation
  155. file
  156. --write-thumbnail write thumbnail image to disk
  157. --load-info FILE json file containing the video information
  158. (created with the "--write-json" option)
  159. --cookies FILE file to read cookies from and dump cookie
  160. jar in
  161. --cache-dir DIR Location in the filesystem where youtube-dl
  162. can store some downloaded information
  163. permanently. By default $XDG_CACHE_HOME
  164. /youtube-dl or ~/.cache/youtube-dl . At the
  165. moment, only YouTube player files (for
  166. videos with obfuscated signatures) are
  167. cached, but that may change.
  168. --no-cache-dir Disable filesystem caching
  169. --rm-cache-dir Delete all filesystem cache files
  170. ## Verbosity / Simulation Options:
  171. -q, --quiet activates quiet mode
  172. --no-warnings Ignore warnings
  173. -s, --simulate do not download the video and do not write
  174. anything to disk
  175. --skip-download do not download the video
  176. -g, --get-url simulate, quiet but print URL
  177. -e, --get-title simulate, quiet but print title
  178. --get-id simulate, quiet but print id
  179. --get-thumbnail simulate, quiet but print thumbnail URL
  180. --get-description simulate, quiet but print video description
  181. --get-duration simulate, quiet but print video length
  182. --get-filename simulate, quiet but print output filename
  183. --get-format simulate, quiet but print output format
  184. -j, --dump-json simulate, quiet but print JSON information.
  185. See --output for a description of available
  186. keys.
  187. -J, --dump-single-json simulate, quiet but print JSON information
  188. for each command-line argument. If the URL
  189. refers to a playlist, dump the whole
  190. playlist information in a single line.
  191. --newline output progress bar as new lines
  192. --no-progress do not print progress bar
  193. --console-title display progress in console titlebar
  194. -v, --verbose print various debugging information
  195. --dump-intermediate-pages print downloaded pages to debug problems
  196. (very verbose)
  197. --write-pages Write downloaded intermediary pages to
  198. files in the current directory to debug
  199. problems
  200. --print-traffic Display sent and read HTTP traffic
  201. ## Workarounds:
  202. --encoding ENCODING Force the specified encoding (experimental)
  203. --no-check-certificate Suppress HTTPS certificate validation.
  204. --prefer-insecure Use an unencrypted connection to retrieve
  205. information about the video. (Currently
  206. supported only for YouTube)
  207. --user-agent UA specify a custom user agent
  208. --referer URL specify a custom referer, use if the video
  209. access is restricted to one domain
  210. --add-header FIELD:VALUE specify a custom HTTP header and its value,
  211. separated by a colon ':'. You can use this
  212. option multiple times
  213. --bidi-workaround Work around terminals that lack
  214. bidirectional text support. Requires bidiv
  215. or fribidi executable in PATH
  216. ## Video Format Options:
  217. -f, --format FORMAT video format code, specify the order of
  218. preference using slashes: -f 22/17/18 . -f
  219. mp4 , -f m4a and -f flv are also
  220. supported. You can also use the special
  221. names "best", "bestvideo", "bestaudio",
  222. "worst", "worstvideo" and "worstaudio". By
  223. default, youtube-dl will pick the best
  224. quality. Use commas to download multiple
  225. audio formats, such as -f
  226. 136/137/mp4/bestvideo,140/m4a/bestaudio.
  227. You can merge the video and audio of two
  228. formats into a single file using -f <video-
  229. format>+<audio-format> (requires ffmpeg or
  230. avconv), for example -f
  231. bestvideo+bestaudio.
  232. --all-formats download all available video formats
  233. --prefer-free-formats prefer free video formats unless a specific
  234. one is requested
  235. --max-quality FORMAT highest quality format to download
  236. -F, --list-formats list all available formats
  237. --youtube-skip-dash-manifest Do not download the DASH manifest on
  238. YouTube videos
  239. ## Subtitle Options:
  240. --write-sub write subtitle file
  241. --write-auto-sub write automatic subtitle file (youtube
  242. only)
  243. --all-subs downloads all the available subtitles of
  244. the video
  245. --list-subs lists all available subtitles for the video
  246. --sub-format FORMAT subtitle format (default=srt) ([sbv/vtt]
  247. youtube only)
  248. --sub-lang LANGS languages of the subtitles to download
  249. (optional) separated by commas, use IETF
  250. language tags like 'en,pt'
  251. ## Authentication Options:
  252. -u, --username USERNAME login with this account ID
  253. -p, --password PASSWORD account password
  254. -2, --twofactor TWOFACTOR two-factor auth code
  255. -n, --netrc use .netrc authentication data
  256. --video-password PASSWORD video password (vimeo, smotri)
  257. ## Post-processing Options:
  258. -x, --extract-audio convert video files to audio-only files
  259. (requires ffmpeg or avconv and ffprobe or
  260. avprobe)
  261. --audio-format FORMAT "best", "aac", "vorbis", "mp3", "m4a",
  262. "opus", or "wav"; "best" by default
  263. --audio-quality QUALITY ffmpeg/avconv audio quality specification,
  264. insert a value between 0 (better) and 9
  265. (worse) for VBR or a specific bitrate like
  266. 128K (default 5)
  267. --recode-video FORMAT Encode the video to another format if
  268. necessary (currently supported:
  269. mp4|flv|ogg|webm|mkv)
  270. -k, --keep-video keeps the video file on disk after the
  271. post-processing; the video is erased by
  272. default
  273. --no-post-overwrites do not overwrite post-processed files; the
  274. post-processed files are overwritten by
  275. default
  276. --embed-subs embed subtitles in the video (only for mp4
  277. videos)
  278. --embed-thumbnail embed thumbnail in the audio as cover art
  279. --add-metadata write metadata to the video file
  280. --xattrs write metadata to the video file's xattrs
  281. (using dublin core and xdg standards)
  282. --prefer-avconv Prefer avconv over ffmpeg for running the
  283. postprocessors (default)
  284. --prefer-ffmpeg Prefer ffmpeg over avconv for running the
  285. postprocessors
  286. --exec CMD Execute a command on the file after
  287. downloading, similar to find's -exec
  288. syntax. Example: --exec 'adb push {}
  289. /sdcard/Music/ && rm {}'
  290. # CONFIGURATION
  291. You can configure youtube-dl by placing default arguments (such as `--extract-audio --no-mtime` to always extract the audio and not copy the mtime) into `/etc/youtube-dl.conf` and/or `~/.config/youtube-dl/config`. On Windows, the configuration file locations are `%APPDATA%\youtube-dl\config.txt` and `C:\Users\<Yourname>\youtube-dl.conf`.
  292. # OUTPUT TEMPLATE
  293. The `-o` option allows users to indicate a template for the output file names. The basic usage is not to set any template arguments when downloading a single file, like in `youtube-dl -o funny_video.flv "http://some/video"`. However, it may contain special sequences that will be replaced when downloading each video. The special sequences have the format `%(NAME)s`. To clarify, that is a percent symbol followed by a name in parenthesis, followed by a lowercase S. Allowed names are:
  294. - `id`: The sequence will be replaced by the video identifier.
  295. - `url`: The sequence will be replaced by the video URL.
  296. - `uploader`: The sequence will be replaced by the nickname of the person who uploaded the video.
  297. - `upload_date`: The sequence will be replaced by the upload date in YYYYMMDD format.
  298. - `title`: The sequence will be replaced by the video title.
  299. - `ext`: The sequence will be replaced by the appropriate extension (like flv or mp4).
  300. - `epoch`: The sequence will be replaced by the Unix epoch when creating the file.
  301. - `autonumber`: The sequence will be replaced by a five-digit number that will be increased with each download, starting at zero.
  302. - `playlist`: The name or the id of the playlist that contains the video.
  303. - `playlist_index`: The index of the video in the playlist, a five-digit number.
  304. The current default template is `%(title)s-%(id)s.%(ext)s`.
  305. In some cases, you don't want special characters such as 中, spaces, or &, such as when transferring the downloaded filename to a Windows system or the filename through an 8bit-unsafe channel. In these cases, add the `--restrict-filenames` flag to get a shorter title:
  306. ```bash
  307. $ youtube-dl --get-filename -o "%(title)s.%(ext)s" BaW_jenozKc
  308. youtube-dl test video ''_ä↭𝕐.mp4 # All kinds of weird characters
  309. $ youtube-dl --get-filename -o "%(title)s.%(ext)s" BaW_jenozKc --restrict-filenames
  310. youtube-dl_test_video_.mp4 # A simple file name
  311. ```
  312. # VIDEO SELECTION
  313. Videos can be filtered by their upload date using the options `--date`, `--datebefore` or `--dateafter`, they accept dates in two formats:
  314. - Absolute dates: Dates in the format `YYYYMMDD`.
  315. - Relative dates: Dates in the format `(now|today)[+-][0-9](day|week|month|year)(s)?`
  316. Examples:
  317. ```bash
  318. # Download only the videos uploaded in the last 6 months
  319. $ youtube-dl --dateafter now-6months
  320. # Download only the videos uploaded on January 1, 1970
  321. $ youtube-dl --date 19700101
  322. $ # will only download the videos uploaded in the 200x decade
  323. $ youtube-dl --dateafter 20000101 --datebefore 20091231
  324. ```
  325. # FAQ
  326. ### How do I update youtube-dl?
  327. If you've followed [our manual installation instructions](http://rg3.github.io/youtube-dl/download.html), you can simply run `youtube-dl -U` (or, on Linux, `sudo youtube-dl -U`).
  328. If you have used pip, a simple `sudo pip install -U youtube-dl` is sufficient to update.
  329. If you have installed youtube-dl using a package manager like *apt-get* or *yum*, use the standard system update mechanism to update. Note that distribution packages are often outdated. As a rule of thumb, youtube-dl releases at least once a month, and often weekly or even daily. Simply go to http://yt-dl.org/ to find out the current version. Unfortunately, there is nothing we youtube-dl developers can do if your distributions serves a really outdated version. You can (and should) complain to your distribution in their bugtracker or support forum.
  330. As a last resort, you can also uninstall the version installed by your package manager and follow our manual installation instructions. For that, remove the distribution's package, with a line like
  331. sudo apt-get remove -y youtube-dl
  332. Afterwards, simply follow [our manual installation instructions](http://rg3.github.io/youtube-dl/download.html):
  333. ```
  334. sudo wget https://yt-dl.org/latest/youtube-dl -O /usr/local/bin/youtube-dl
  335. sudo chmod a+x /usr/local/bin/youtube-dl
  336. hash -r
  337. ```
  338. Again, from then on you'll be able to update with `sudo youtube-dl -U`.
  339. ### I'm getting an error `Unable to extract OpenGraph title` on YouTube playlists
  340. YouTube changed their playlist format in March 2014 and later on, so you'll need at least youtube-dl 2014.07.25 to download all YouTube videos.
  341. If you have installed youtube-dl with a package manager, pip, setup.py or a tarball, please use that to update. Note that Ubuntu packages do not seem to get updated anymore. Since we are not affiliated with Ubuntu, there is little we can do. Feel free to [report bugs](https://bugs.launchpad.net/ubuntu/+source/youtube-dl/+filebug) to the [Ubuntu packaging guys](mailto:ubuntu-motu@lists.ubuntu.com?subject=outdated%20version%20of%20youtube-dl) - all they have to do is update the package to a somewhat recent version. See above for a way to update.
  342. ### Do I always have to pass in `--max-quality FORMAT`, or `-citw`?
  343. By default, youtube-dl intends to have the best options (incidentally, if you have a convincing case that these should be different, [please file an issue where you explain that](https://yt-dl.org/bug)). Therefore, it is unnecessary and sometimes harmful to copy long option strings from webpages. In particular, `--max-quality` *limits* the video quality (so if you want the best quality, do NOT pass it in), and the only option out of `-citw` that is regularly useful is `-i`.
  344. ### Can you please put the -b option back?
  345. Most people asking this question are not aware that youtube-dl now defaults to downloading the highest available quality as reported by YouTube, which will be 1080p or 720p in some cases, so you no longer need the `-b` option. For some specific videos, maybe YouTube does not report them to be available in a specific high quality format you're interested in. In that case, simply request it with the `-f` option and youtube-dl will try to download it.
  346. ### I get HTTP error 402 when trying to download a video. What's this?
  347. Apparently YouTube requires you to pass a CAPTCHA test if you download too much. We're [considering to provide a way to let you solve the CAPTCHA](https://github.com/rg3/youtube-dl/issues/154), but at the moment, your best course of action is pointing a webbrowser to the youtube URL, solving the CAPTCHA, and restart youtube-dl.
  348. ### I have downloaded a video but how can I play it?
  349. Once the video is fully downloaded, use any video player, such as [vlc](http://www.videolan.org) or [mplayer](http://www.mplayerhq.hu/).
  350. ### The links provided by youtube-dl -g are not working anymore
  351. The URLs youtube-dl outputs require the downloader to have the correct cookies. Use the `--cookies` option to write the required cookies into a file, and advise your downloader to read cookies from that file. Some sites also require a common user agent to be used, use `--dump-user-agent` to see the one in use by youtube-dl.
  352. ### ERROR: no fmt_url_map or conn information found in video info
  353. youtube has switched to a new video info format in July 2011 which is not supported by old versions of youtube-dl. You can update youtube-dl with `sudo youtube-dl --update`.
  354. ### ERROR: unable to download video ###
  355. youtube requires an additional signature since September 2012 which is not supported by old versions of youtube-dl. You can update youtube-dl with `sudo youtube-dl --update`.
  356. ### SyntaxError: Non-ASCII character ###
  357. The error
  358. File "youtube-dl", line 2
  359. SyntaxError: Non-ASCII character '\x93' ...
  360. means you're using an outdated version of Python. Please update to Python 2.6 or 2.7.
  361. ### What is this binary file? Where has the code gone?
  362. Since June 2012 (#342) youtube-dl is packed as an executable zipfile, simply unzip it (might need renaming to `youtube-dl.zip` first on some systems) or clone the git repository, as laid out above. If you modify the code, you can run it by executing the `__main__.py` file. To recompile the executable, run `make youtube-dl`.
  363. ### The exe throws a *Runtime error from Visual C++*
  364. To run the exe you need to install first the [Microsoft Visual C++ 2008 Redistributable Package](http://www.microsoft.com/en-us/download/details.aspx?id=29).
  365. # DEVELOPER INSTRUCTIONS
  366. Most users do not need to build youtube-dl and can [download the builds](http://rg3.github.io/youtube-dl/download.html) or get them from their distribution.
  367. To run youtube-dl as a developer, you don't need to build anything either. Simply execute
  368. python -m youtube_dl
  369. To run the test, simply invoke your favorite test runner, or execute a test file directly; any of the following work:
  370. python -m unittest discover
  371. python test/test_download.py
  372. nosetests
  373. If you want to create a build of youtube-dl yourself, you'll need
  374. * python
  375. * make
  376. * pandoc
  377. * zip
  378. * nosetests
  379. ### Adding support for a new site
  380. If you want to add support for a new site, you can follow this quick list (assuming your service is called `yourextractor`):
  381. 1. [Fork this repository](https://github.com/rg3/youtube-dl/fork)
  382. 2. Check out the source code with `git clone git@github.com:YOUR_GITHUB_USERNAME/youtube-dl.git`
  383. 3. Start a new git branch with `cd youtube-dl; git checkout -b yourextractor`
  384. 4. Start with this simple template and save it to `youtube_dl/extractor/yourextractor.py`:
  385. ```python
  386. # coding: utf-8
  387. from __future__ import unicode_literals
  388. from .common import InfoExtractor
  389. class YourExtractorIE(InfoExtractor):
  390. _VALID_URL = r'https?://(?:www\.)?yourextractor\.com/watch/(?P<id>[0-9]+)'
  391. _TEST = {
  392. 'url': 'http://yourextractor.com/watch/42',
  393. 'md5': 'TODO: md5 sum of the first 10241 bytes of the video file (use --test)',
  394. 'info_dict': {
  395. 'id': '42',
  396. 'ext': 'mp4',
  397. 'title': 'Video title goes here',
  398. 'thumbnail': 're:^https?://.*\.jpg$',
  399. # TODO more properties, either as:
  400. # * A value
  401. # * MD5 checksum; start the string with md5:
  402. # * A regular expression; start the string with re:
  403. # * Any Python type (for example int or float)
  404. }
  405. }
  406. def _real_extract(self, url):
  407. video_id = self._match_id(url)
  408. webpage = self._download_webpage(url, video_id)
  409. # TODO more code goes here, for example ...
  410. title = self._html_search_regex(r'<h1>(.*?)</h1>', webpage, 'title')
  411. return {
  412. 'id': video_id,
  413. 'title': title,
  414. 'description': self._og_search_description(webpage),
  415. # TODO more properties (see youtube_dl/extractor/common.py)
  416. }
  417. ```
  418. 5. Add an import in [`youtube_dl/extractor/__init__.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/__init__.py).
  419. 6. Run `python test/test_download.py TestDownload.test_YourExtractor`. This *should fail* at first, but you can continually re-run it until you're done. If you decide to add more than one test, then rename ``_TEST`` to ``_TESTS`` and make it into a list of dictionaries. The tests will be then be named `TestDownload.test_YourExtractor`, `TestDownload.test_YourExtractor_1`, `TestDownload.test_YourExtractor_2`, etc.
  420. 7. Have a look at [`youtube_dl/common/extractor/common.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py) for possible helper methods and a [detailed description of what your extractor should return](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L38). Add tests and code for as many as you want.
  421. 8. If you can, check the code with [pyflakes](https://pypi.python.org/pypi/pyflakes) (a good idea) and [pep8](https://pypi.python.org/pypi/pep8) (optional, ignore E501).
  422. 9. When the tests pass, [add](http://git-scm.com/docs/git-add) the new files and [commit](http://git-scm.com/docs/git-commit) them and [push](http://git-scm.com/docs/git-push) the result, like this:
  423. $ git add youtube_dl/extractor/__init__.py
  424. $ git add youtube_dl/extractor/yourextractor.py
  425. $ git commit -m '[yourextractor] Add new extractor'
  426. $ git push origin yourextractor
  427. 10. Finally, [create a pull request](https://help.github.com/articles/creating-a-pull-request). We'll then review and merge it.
  428. In any case, thank you very much for your contributions!
  429. # EMBEDDING YOUTUBE-DL
  430. youtube-dl makes the best effort to be a good command-line program, and thus should be callable from any programming language. If you encounter any problems parsing its output, feel free to [create a report](https://github.com/rg3/youtube-dl/issues/new).
  431. From a Python program, you can embed youtube-dl in a more powerful fashion, like this:
  432. import youtube_dl
  433. ydl_opts = {}
  434. with youtube_dl.YoutubeDL(ydl_opts) as ydl:
  435. ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])
  436. Most likely, you'll want to use various options. For a list of what can be done, have a look at [youtube_dl/YoutubeDL.py](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/YoutubeDL.py#L69). For a start, if you want to intercept youtube-dl's output, set a `logger` object.
  437. # BUGS
  438. Bugs and suggestions should be reported at: <https://github.com/rg3/youtube-dl/issues> . Unless you were prompted so or there is another pertinent reason (e.g. GitHub fails to accept the bug report), please do not send bug reports via personal email.
  439. Please include the full output of the command when run with `--verbose`. The output (including the first lines) contain important debugging information. Issues without the full output are often not reproducible and therefore do not get solved in short order, if ever.
  440. For discussions, join us in the irc channel #youtube-dl on freenode.
  441. When you submit a request, please re-read it once to avoid a couple of mistakes (you can and should use this as a checklist):
  442. ### Is the description of the issue itself sufficient?
  443. We often get issue reports that we cannot really decipher. While in most cases we eventually get the required information after asking back multiple times, this poses an unnecessary drain on our resources. Many contributors, including myself, are also not native speakers, so we may misread some parts.
  444. So please elaborate on what feature you are requesting, or what bug you want to be fixed. Make sure that it's obvious
  445. - What the problem is
  446. - How it could be fixed
  447. - How your proposed solution would look like
  448. If your report is shorter than two lines, it is almost certainly missing some of these, which makes it hard for us to respond to it. We're often too polite to close the issue outright, but the missing info makes misinterpretation likely. As a commiter myself, I often get frustrated by these issues, since the only possible way for me to move forward on them is to ask for clarification over and over.
  449. For bug reports, this means that your report should contain the *complete* output of youtube-dl when called with the -v flag. The error message you get for (most) bugs even says so, but you would not believe how many of our bug reports do not contain this information.
  450. Site support requests **must contain an example URL**. An example URL is a URL you might want to download, like http://www.youtube.com/watch?v=BaW_jenozKc . There should be an obvious video present. Except under very special circumstances, the main page of a video service (e.g. http://www.youtube.com/ ) is *not* an example URL.
  451. ### Are you using the latest version?
  452. Before reporting any issue, type youtube-dl -U. This should report that you're up-to-date. About 20% of the reports we receive are already fixed, but people are using outdated versions. This goes for feature requests as well.
  453. ### Is the issue already documented?
  454. Make sure that someone has not already opened the issue you're trying to open. Search at the top of the window or at https://github.com/rg3/youtube-dl/search?type=Issues . If there is an issue, feel free to write something along the lines of "This affects me as well, with version 2015.01.01. Here is some more information on the issue: ...". While some issues may be old, a new post into them often spurs rapid activity.
  455. ### Why are existing options not enough?
  456. Before requesting a new feature, please have a quick peek at [the list of supported options](https://github.com/rg3/youtube-dl/blob/master/README.md#synopsis). Many feature requests are for features that actually exist already! Please, absolutely do show off your work in the issue report and detail how the existing similar options do *not* solve your problem.
  457. ### Is there enough context in your bug report?
  458. People want to solve problems, and often think they do us a favor by breaking down their larger problems (e.g. wanting to skip already downloaded files) to a specific request (e.g. requesting us to look whether the file exists before downloading the info page). However, what often happens is that they break down the problem into two steps: One simple, and one impossible (or extremely complicated one).
  459. We are then presented with a very complicated request when the original problem could be solved far easier, e.g. by recording the downloaded video IDs in a separate file. To avoid this, you must include the greater context where it is non-obvious. In particular, every feature request that does not consist of adding support for a new site should contain a use case scenario that explains in what situation the missing feature would be useful.
  460. ### Does the issue involve one problem, and one problem only?
  461. Some of our users seem to think there is a limit of issues they can or should open. There is no limit of issues they can or should open. While it may seem appealing to be able to dump all your issues into one ticket, that means that someone who solves one of your issues cannot mark the issue as closed. Typically, reporting a bunch of issues leads to the ticket lingering since nobody wants to attack that behemoth, until someone mercifully splits the issue into multiple ones.
  462. In particular, every site support request issue should only pertain to services at one site (generally under a common domain, but always using the same backend technology). Do not request support for vimeo user videos, Whitehouse podcasts, and Google Plus pages in the same issue. Also, make sure that you don't post bug reports alongside feature requests. As a rule of thumb, a feature request does not include outputs of youtube-dl that are not immediately related to the feature at hand. Do not post reports of a network error alongside the request for a new video service.
  463. ### Is anyone going to need the feature?
  464. Only post features that you (or an incapicated friend you can personally talk to) require. Do not post features because they seem like a good idea. If they are really useful, they will be requested by someone who requires them.
  465. ### Is your question about youtube-dl?
  466. It may sound strange, but some bug reports we receive are completely unrelated to youtube-dl and relate to a different or even the reporter's own application. Please make sure that you are actually using youtube-dl. If you are using a UI for youtube-dl, report the bug to the maintainer of the actual application providing the UI. On the other hand, if your UI for youtube-dl fails in some way you believe is related to youtube-dl, by all means, go ahead and report the bug.
  467. # COPYRIGHT
  468. youtube-dl is released into the public domain by the copyright holders.
  469. This README file was originally written by Daniel Bolton (<https://github.com/dbbolton>) and is likewise released into the public domain.