Prepare to upload

[youtubedl] / youtube-dl.1

diff --git a/youtube-dl.1 b/youtube-dl.1
index b859b1de59c61f51f5cd0e76466aab6ebf3f0b42..cb8f218560b8cbb1e1f26e313c9318b7356d0b16 100644 (file)
--- a/youtube-dl.1
+++ b/youtube-dl.1
@@ -1,4 +1,7 @@
+.\" Automatically generated by Pandoc 2.1.3
+.\"

 .TH "YOUTUBE\-DL" "1" "" "" ""
 .TH "YOUTUBE\-DL" "1" "" "" ""

+.hy

 .SH NAME
 .PP
 youtube\-dl \- download videos from youtube.com or other video platforms
 .SH NAME
 .PP
 youtube\-dl \- download videos from youtube.com or other video platforms


@@ -113,7 +116,7 @@ Do not emit color codes in output
 .TP
 .B \-\-proxy \f[I]URL\f[]
 Use the specified HTTP/HTTPS/SOCKS proxy.
 .TP
 .B \-\-proxy \f[I]URL\f[]
 Use the specified HTTP/HTTPS/SOCKS proxy.

-To enable experimental SOCKS proxy, specify a proper scheme.
+To enable SOCKS proxy, specify a proper scheme.

 For example socks5://127.0.0.1:1080/.
 Pass in an empty string (\-\-proxy "") for direct connection
 .RS
 For example socks5://127.0.0.1:1080/.
 Pass in an empty string (\-\-proxy "") for direct connection
 .RS


@@ -142,26 +145,31 @@ Make all connections via IPv6
 .TP
 .B \-\-geo\-verification\-proxy \f[I]URL\f[]
 Use this proxy to verify the IP address for some geo\-restricted sites.
 .TP
 .B \-\-geo\-verification\-proxy \f[I]URL\f[]
 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
+The default proxy specified by \-\-proxy (or none, if the option is not

 present) is used for the actual downloading.
 .RS
 .RE
 .TP
 .B \-\-geo\-bypass
 Bypass geographic restriction via faking X\-Forwarded\-For HTTP header
 present) is used for the actual downloading.
 .RS
 .RE
 .TP
 .B \-\-geo\-bypass
 Bypass geographic restriction via faking X\-Forwarded\-For HTTP header

-(experimental)

 .RS
 .RE
 .TP
 .B \-\-no\-geo\-bypass
 Do not bypass geographic restriction via faking X\-Forwarded\-For HTTP
 .RS
 .RE
 .TP
 .B \-\-no\-geo\-bypass
 Do not bypass geographic restriction via faking X\-Forwarded\-For HTTP

-header (experimental)
+header

 .RS
 .RE
 .TP
 .B \-\-geo\-bypass\-country \f[I]CODE\f[]
 Force bypass geographic restriction with explicitly provided two\-letter
 .RS
 .RE
 .TP
 .B \-\-geo\-bypass\-country \f[I]CODE\f[]
 Force bypass geographic restriction with explicitly provided two\-letter

-ISO 3166\-2 country code (experimental)
+ISO 3166\-2 country code
+.RS
+.RE
+.TP
+.B \-\-geo\-bypass\-ip\-block \f[I]IP_BLOCK\f[]
+Force bypass geographic restriction with explicitly provided IP block in
+CIDR notation

 .RS
 .RE
 .SS Video Selection:
 .RS
 .RE
 .SS Video Selection:


@@ -350,7 +358,7 @@ Download playlist videos in random order
 .RE
 .TP
 .B \-\-xattr\-set\-filesize
 .RE
 .TP
 .B \-\-xattr\-set\-filesize

-Set file xattribute ytdl.filesize with expected file size (experimental)
+Set file xattribute ytdl.filesize with expected file size

 .RS
 .RE
 .TP
 .RS
 .RE
 .TP


@@ -383,7 +391,10 @@ Give these arguments to the external downloader
 .SS Filesystem Options:
 .TP
 .B \-a, \-\-batch\-file \f[I]FILE\f[]
 .SS Filesystem Options:
 .TP
 .B \-a, \-\-batch\-file \f[I]FILE\f[]

-File containing URLs to download (\[aq]\-\[aq] for stdin)
+File containing URLs to download (\[aq]\-\[aq] for stdin), one URL per
+line.
+Lines starting with \[aq]#\[aq], \[aq];\[aq] or \[aq]]\[aq] are
+considered as comments and ignored.

 .RS
 .RE
 .TP
 .RS
 .RE
 .TP


@@ -879,12 +890,12 @@ One of never (do nothing), warn (only emit a warning), detect_or_warn
 .RE
 .TP
 .B \-\-prefer\-avconv
 .RE
 .TP
 .B \-\-prefer\-avconv

-Prefer avconv over ffmpeg for running the postprocessors (default)
+Prefer avconv over ffmpeg for running the postprocessors

 .RS
 .RE
 .TP
 .B \-\-prefer\-ffmpeg
 .RS
 .RE
 .TP
 .B \-\-prefer\-ffmpeg

-Prefer ffmpeg over avconv for running the postprocessors
+Prefer ffmpeg over avconv for running the postprocessors (default)

 .RS
 .RE
 .TP
 .RS
 .RE
 .TP


@@ -910,7 +921,7 @@ srt|ass|vtt|lrc)
 .PP
 You can configure youtube\-dl by placing any supported command line
 option to a configuration file.
 .PP
 You can configure youtube\-dl by placing any supported command line
 option to a configuration file.

-On Linux and OS X, the system wide configuration file is located at
+On Linux and macOS, the system wide configuration file is located at

 \f[C]/etc/youtube\-dl.conf\f[] and the user wide configuration file at
 \f[C]~/.config/youtube\-dl/config\f[].
 On Windows, the user wide configuration file locations are
 \f[C]/etc/youtube\-dl.conf\f[] and the user wide configuration file at
 \f[C]~/.config/youtube\-dl/config\f[].
 On Windows, the user wide configuration file locations are


@@ -994,7 +1005,7 @@ machine\ twitch\ login\ my_twitch_account_name\ password\ my_twitch_password
 .PP
 To activate authentication with the \f[C]\&.netrc\f[] file you should
 pass \f[C]\-\-netrc\f[] to youtube\-dl or place it in the configuration
 .PP
 To activate authentication with the \f[C]\&.netrc\f[] file you should
 pass \f[C]\-\-netrc\f[] to youtube\-dl or place it in the configuration

-file (#configuration).
+file.

 .PP
 On Windows you may also need to setup the \f[C]%HOME%\f[] environment
 variable manually.
 .PP
 On Windows you may also need to setup the \f[C]%HOME%\f[] environment
 variable manually.


@@ -1010,7 +1021,7 @@ set\ HOME=%USERPROFILE%
 The \f[C]\-o\f[] option allows users to indicate a template for the
 output file names.
 .PP
 The \f[C]\-o\f[] option allows users to indicate a template for the
 output file names.
 .PP

-\f[B]tl;dr:\f[] navigate me to examples (#output-template-examples).
+\f[B]tl;dr:\f[] navigate me to examples.

 .PP
 The basic usage is not to set any template arguments when downloading a
 single file, like in
 .PP
 The basic usage is not to set any template arguments when downloading a
 single file, like in


@@ -1022,7 +1033,7 @@ formatting
 operations (https://docs.python.org/2/library/stdtypes.html#string-formatting).
 For example, \f[C]%(NAME)s\f[] or \f[C]%(NAME)05d\f[].
 To clarify, that is a percent symbol followed by a name in parentheses,
 operations (https://docs.python.org/2/library/stdtypes.html#string-formatting).
 For example, \f[C]%(NAME)s\f[] or \f[C]%(NAME)05d\f[].
 To clarify, that is a percent symbol followed by a name in parentheses,

-followed by a formatting operations.
+followed by formatting operations.

 Allowed names along with sequence type are:
 .IP \[bu] 2
 \f[C]id\f[] (string): Video identifier
 Allowed names along with sequence type are:
 .IP \[bu] 2
 \f[C]id\f[] (string): Video identifier


@@ -1053,6 +1064,11 @@ became available
 .IP \[bu] 2
 \f[C]uploader_id\f[] (string): Nickname or id of the video uploader
 .IP \[bu] 2
 .IP \[bu] 2
 \f[C]uploader_id\f[] (string): Nickname or id of the video uploader
 .IP \[bu] 2

+\f[C]channel\f[] (string): Full name of the channel the video is
+uploaded on
+.IP \[bu] 2
+\f[C]channel_id\f[] (string): Id of the channel
+.IP \[bu] 2

 \f[C]location\f[] (string): Physical location where the video was filmed
 .IP \[bu] 2
 \f[C]duration\f[] (numeric): Length of the video in seconds
 \f[C]location\f[] (string): Physical location where the video was filmed
 .IP \[bu] 2
 \f[C]duration\f[] (numeric): Length of the video in seconds


@@ -1290,7 +1306,7 @@ expression\f[], i.e.
 an expression that describes format or formats you would like to
 download.
 .PP
 an expression that describes format or formats you would like to
 download.
 .PP

-\f[B]tl;dr:\f[] navigate me to examples (#format-selection-examples).
+\f[B]tl;dr:\f[] navigate me to examples.

 .PP
 The simplest case is requesting a specific format, for example with
 \f[C]\-f\ 22\f[] you can download the format with format code equal to
 .PP
 The simplest case is requesting a specific format, for example with
 \f[C]\-f\ 22\f[] you can download the format with format code equal to


@@ -1415,8 +1431,8 @@ If you want to preserve the old format selection behavior (prior to
 youtube\-dl 2015.04.26), i.e.
 you want to download the best available quality media served as a single
 file, you should explicitly specify your choice with \f[C]\-f\ best\f[].
 youtube\-dl 2015.04.26), i.e.
 you want to download the best available quality media served as a single
 file, you should explicitly specify your choice with \f[C]\-f\ best\f[].

-You may want to add it to the configuration file (#configuration) in
-order not to type it every time you run youtube\-dl.
+You may want to add it to the configuration file in order not to type it
+every time you run youtube\-dl.

 .SS Format selection examples
 .PP
 Note that on Windows you may need to use double quotes instead of
 .SS Format selection examples
 .PP
 Note that on Windows you may need to use double quotes instead of


@@ -1626,12 +1642,12 @@ youtube\-dl in turn.
 .PP
 YouTube has switched to a new video info format in July 2011 which is
 not supported by old versions of youtube\-dl.
 .PP
 YouTube has switched to a new video info format in July 2011 which is
 not supported by old versions of youtube\-dl.

-See above (#how-do-i-update-youtube-dl) for how to update youtube\-dl.
+See above for how to update youtube\-dl.

 .SS ERROR: unable to download video
 .PP
 YouTube requires an additional signature since September 2012 which is
 not supported by old versions of youtube\-dl.
 .SS ERROR: unable to download video
 .PP
 YouTube requires an additional signature since September 2012 which is
 not supported by old versions of youtube\-dl.

-See above (#how-do-i-update-youtube-dl) for how to update youtube\-dl.
+See above for how to update youtube\-dl.

 .SS Video URL contains an ampersand and I\[aq]m getting some strange
 output \f[C][1]\ 2839\f[] or
 \f[C]\[aq]v\[aq]\ is\ not\ recognized\ as\ an\ internal\ or\ external\ command\f[]
 .SS Video URL contains an ampersand and I\[aq]m getting some strange
 output \f[C][1]\ 2839\f[] or
 \f[C]\[aq]v\[aq]\ is\ not\ recognized\ as\ an\ internal\ or\ external\ command\f[]


@@ -1662,15 +1678,15 @@ For Windows you have to use the double quotes:
 .PP
 In February 2015, the new YouTube player contained a character sequence
 in a string that was misinterpreted by old versions of youtube\-dl.
 .PP
 In February 2015, the new YouTube player contained a character sequence
 in a string that was misinterpreted by old versions of youtube\-dl.

-See above (#how-do-i-update-youtube-dl) for how to update youtube\-dl.
+See above for how to update youtube\-dl.

 .SS HTTP Error 429: Too Many Requests or 402: Payment Required
 .PP
 These two error codes indicate that the service is blocking your IP
 address because of overuse.
 Contact the service and ask them to unblock your IP address, or \- if
 you have acquired a whitelisted IP address already \- use the
 .SS HTTP Error 429: Too Many Requests or 402: Payment Required
 .PP
 These two error codes indicate that the service is blocking your IP
 address because of overuse.
 Contact the service and ask them to unblock your IP address, or \- if
 you have acquired a whitelisted IP address already \- use the

-\f[C]\-\-proxy\f[] or \f[C]\-\-source\-address\f[]
-options (#network-options) to select another IP address.
+\f[C]\-\-proxy\f[] or \f[C]\-\-source\-address\f[] options to select
+another IP address.

 .SS SyntaxError: Non\-ASCII character
 .PP
 The error
 .SS SyntaxError: Non\-ASCII character
 .PP
 The error


@@ -1718,10 +1734,10 @@ ffmpeg) by simply typing \f[C]youtube\-dl\f[] or \f[C]ffmpeg\f[], no
 matter what directory you\[aq]re in.
 .SS How do I put downloads into a specific folder?
 .PP
 matter what directory you\[aq]re in.
 .SS How do I put downloads into a specific folder?
 .PP

-Use the \f[C]\-o\f[] to specify an output template (#output-template),
-for example \f[C]\-o\ "/home/user/videos/%(title)s\-%(id)s.%(ext)s"\f[].
+Use the \f[C]\-o\f[] to specify an output template, for example
+\f[C]\-o\ "/home/user/videos/%(title)s\-%(id)s.%(ext)s"\f[].

 If you want this for all of your downloads, put the option into your
 If you want this for all of your downloads, put the option into your

-configuration file (#configuration).
+configuration file.

 .SS How do I download a video starting with a \f[C]\-\f[]?
 .PP
 Either prepend \f[C]https://www.youtube.com/watch?v=\f[] or separate the
 .SS How do I download a video starting with a \f[C]\-\f[]?
 .PP
 Either prepend \f[C]https://www.youtube.com/watch?v=\f[] or separate the


@@ -1742,8 +1758,8 @@ In order to extract cookies from browser use any conforming browser
 extension for exporting cookies.
 For example,
 cookies.txt (https://chrome.google.com/webstore/detail/cookiestxt/njabckikapfpffapmjgojcnbfjonfjfg)
 extension for exporting cookies.
 For example,
 cookies.txt (https://chrome.google.com/webstore/detail/cookiestxt/njabckikapfpffapmjgojcnbfjonfjfg)

-(for Chrome) or Export
-Cookies (https://addons.mozilla.org/en-US/firefox/addon/export-cookies/)
+(for Chrome) or
+cookies.txt (https://addons.mozilla.org/en-US/firefox/addon/cookies-txt/)

 (for Firefox).
 .PP
 Note that the cookies file must be in Mozilla/Netscape format and the
 (for Firefox).
 .PP
 Note that the cookies file must be in Mozilla/Netscape format and the


@@ -1869,7 +1885,7 @@ serves as a unified point.
 Unfortunately, the youtube\-dl project has grown too large to use
 personal email as an effective communication channel.
 .PP
 Unfortunately, the youtube\-dl project has grown too large to use
 personal email as an effective communication channel.
 .PP

-Please read the bug reporting instructions (#bugs) below.
+Please read the bug reporting instructions below.

 A lot of bugs lack all the necessary information.
 If you can, offer proxy, VPN, or shell access to the youtube\-dl
 developers.
 A lot of bugs lack all the necessary information.
 If you can, offer proxy, VPN, or shell access to the youtube\-dl
 developers.


@@ -1915,15 +1931,14 @@ you run it from a Python program.
 .SH Why do I need to go through that much red tape when filing bugs?
 .PP
 Before we had the issue template, despite our extensive bug reporting
 .SH Why do I need to go through that much red tape when filing bugs?
 .PP
 Before we had the issue template, despite our extensive bug reporting

-instructions (#bugs), about 80% of the issue reports we got were
-useless, for instance because people used ancient versions hundreds of
-releases old, because of simple syntactic errors (not in youtube\-dl but
-in general shell usage), because the problem was already reported
-multiple times before, because people did not actually read an error
-message, even if it said "please install ffmpeg", because people did not
-mention the URL they were trying to download and many more simple,
-easy\-to\-avoid problems, many of whom were totally unrelated to
-youtube\-dl.
+instructions, about 80% of the issue reports we got were useless, for
+instance because people used ancient versions hundreds of releases old,
+because of simple syntactic errors (not in youtube\-dl but in general
+shell usage), because the problem was already reported multiple times
+before, because people did not actually read an error message, even if
+it said "please install ffmpeg", because people did not mention the URL
+they were trying to download and many more simple, easy\-to\-avoid
+problems, many of whom were totally unrelated to youtube\-dl.

 .PP
 youtube\-dl is an open\-source project manned by too few volunteers, so
 we\[aq]d rather spend time fixing bugs where we are certain none of
 .PP
 youtube\-dl is an open\-source project manned by too few volunteers, so
 we\[aq]d rather spend time fixing bugs where we are certain none of


@@ -1960,8 +1975,8 @@ nosetests
 \f[]
 .fi
 .PP
 \f[]
 .fi
 .PP

-See item 6 of new extractor tutorial (#adding-support-for-a-new-site)
-for how to run extractor specific test cases.
+See item 6 of new extractor tutorial for how to run extractor specific
+test cases.

 .PP
 If you want to create a build of youtube\-dl yourself, you\[aq]ll need
 .IP \[bu] 2
 .PP
 If you want to create a build of youtube\-dl yourself, you\[aq]ll need
 .IP \[bu] 2


@@ -1993,7 +2008,7 @@ Check out the source code with:
 .IP
 .nf
 \f[C]
 .IP
 .nf
 \f[C]

-git\ clone\ git\@github.com:YOUR_GITHUB_USERNAME/youtube\-dl.git
+\ git\ clone\ git\@github.com:YOUR_GITHUB_USERNAME/youtube\-dl.git

 \f[]
 .fi
 .RE
 \f[]
 .fi
 .RE


@@ -2003,8 +2018,8 @@ Start a new git branch with
 .IP
 .nf
 \f[C]
 .IP
 .nf
 \f[C]

-cd\ youtube\-dl
-git\ checkout\ \-b\ yourextractor
+\ cd\ youtube\-dl
+\ git\ checkout\ \-b\ yourextractor

 \f[]
 .fi
 .RE
 \f[]
 .fi
 .RE


@@ -2076,16 +2091,24 @@ Have a look at
 \f[C]youtube_dl/extractor/common.py\f[] (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 and may
 \f[C]youtube_dl/extractor/common.py\f[] (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 and may

-return (https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L74-L252).
+return (https://github.com/rg3/youtube-dl/blob/7f41a598b3fba1bcab2817de64a08941200aa3c8/youtube_dl/extractor/common.py#L94-L303).

 Add tests and code for as many as you want.
 .IP " 8." 4
 Add tests and code for as many as you want.
 .IP " 8." 4

-Make sure your code follows youtube\-dl coding
-conventions (#youtube-dl-coding-conventions) and check the code with
-flake8 (https://pypi.python.org/pypi/flake8).
-Also make sure your code works under all
-Python (https://www.python.org/) versions claimed supported by
-youtube\-dl, namely 2.6, 2.7, and 3.2+.
+Make sure your code follows youtube\-dl coding conventions and check the
+code with
+flake8 (http://flake8.pycqa.org/en/latest/index.html#quickstart):
+.RS 4
+.IP
+.nf
+\f[C]
+\ $\ flake8\ youtube_dl/extractor/yourextractor.py
+\f[]
+.fi
+.RE

 .IP " 9." 4
 .IP " 9." 4

+Make sure your code works under all Python (https://www.python.org/)
+versions claimed supported by youtube\-dl, namely 2.6, 2.7, and 3.2+.
+.IP "10." 4

 When the tests pass, add (https://git-scm.com/docs/git-add) the new
 files and commit (https://git-scm.com/docs/git-commit) them and
 push (https://git-scm.com/docs/git-push) the result, like this:
 When the tests pass, add (https://git-scm.com/docs/git-add) the new
 files and commit (https://git-scm.com/docs/git-commit) them and
 push (https://git-scm.com/docs/git-push) the result, like this:


@@ -2100,7 +2123,7 @@ $\ git\ push\ origin\ yourextractor
 \f[]
 .fi
 .RE
 \f[]
 .fi
 .RE

-.IP "10." 4
+.IP "11." 4

 Finally, create a pull
 request (https://help.github.com/articles/creating-a-pull-request).
 We\[aq]ll then review and merge it.
 Finally, create a pull
 request (https://help.github.com/articles/creating-a-pull-request).
 We\[aq]ll then review and merge it.


@@ -2130,7 +2153,7 @@ update at all.
 .PP
 For extraction to work youtube\-dl relies on metadata your extractor
 extracts and provides to youtube\-dl expressed by an information
 .PP
 For extraction to work youtube\-dl relies on metadata your extractor
 extracts and provides to youtube\-dl expressed by an information

-dictionary (https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L75-L257)
+dictionary (https://github.com/rg3/youtube-dl/blob/7f41a598b3fba1bcab2817de64a08941200aa3c8/youtube_dl/extractor/common.py#L94-L303)

 or simply \f[I]info dict\f[].
 Only the following meta fields in the \f[I]info dict\f[] are considered
 mandatory for a successful extraction process by youtube\-dl:
 or simply \f[I]info dict\f[].
 Only the following meta fields in the \f[I]info dict\f[] are considered
 mandatory for a successful extraction process by youtube\-dl:


@@ -2151,7 +2174,7 @@ extraction does not make any sense without and if any of them fail to be
 extracted then the extractor is considered completely broken.
 .PP
 Any
 extracted then the extractor is considered completely broken.
 .PP
 Any

-field (https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L149-L257)
+field (https://github.com/rg3/youtube-dl/blob/7f41a598b3fba1bcab2817de64a08941200aa3c8/youtube_dl/extractor/common.py#L188-L303)

 apart from the aforementioned ones are considered \f[B]optional\f[].
 That means that extraction should be \f[B]tolerant\f[] to situations
 when sources for these fields can potentially be unavailable (even if
 apart from the aforementioned ones are considered \f[B]optional\f[].
 That means that extraction should be \f[B]tolerant\f[] to situations
 when sources for these fields can potentially be unavailable (even if


@@ -2272,9 +2295,37 @@ title\ =\ meta.get(\[aq]title\[aq])\ or\ self._og_search_title(webpage)
 .PP
 This code will try to extract from \f[C]meta\f[] first and if it fails
 it will try extracting \f[C]og:title\f[] from a \f[C]webpage\f[].
 .PP
 This code will try to extract from \f[C]meta\f[] first and if it fails
 it will try extracting \f[C]og:title\f[] from a \f[C]webpage\f[].

-.SS Make regular expressions flexible
+.SS Regular expressions
+.SS Don\[aq]t capture groups you don\[aq]t use

 .PP
 .PP

-When using regular expressions try to write them fuzzy and flexible.
+Capturing group must be an indication that it\[aq]s used somewhere in
+the code.
+Any group that is not used must be non capturing.
+.SS Example
+.PP
+Don\[aq]t capture id attribute name here since you can\[aq]t use it for
+anything anyway.
+.PP
+Correct:
+.IP
+.nf
+\f[C]
+r\[aq](?:id|ID)=(?P<id>\\d+)\[aq]
+\f[]
+.fi
+.PP
+Incorrect:
+.IP
+.nf
+\f[C]
+r\[aq](id|ID)=(?P<id>\\d+)\[aq]
+\f[]
+.fi
+.SS Make regular expressions relaxed and flexible
+.PP
+When using regular expressions try to write them fuzzy, relaxed and
+flexible, skipping insignificant parts that are more likely to change,
+allowing both single and double quotes for quoted values and so on.

 .SS Example
 .PP
 Say you need to extract \f[C]title\f[] from the following HTML code:
 .SS Example
 .PP
 Say you need to extract \f[C]title\f[] from the following HTML code:


@@ -2317,11 +2368,64 @@ title\ =\ self._search_regex(
 \ \ \ \ webpage,\ \[aq]title\[aq],\ group=\[aq]title\[aq])
 \f[]
 .fi
 \ \ \ \ webpage,\ \[aq]title\[aq],\ group=\[aq]title\[aq])
 \f[]
 .fi

+.SS Long lines policy
+.PP
+There is a soft limit to keep lines of code under 80 characters long.
+This means it should be respected if possible and if it does not make
+readability and code maintenance worse.
+.PP
+For example, you should \f[B]never\f[] split long string literals like
+URLs or some other often copied entities over multiple lines to fit this
+limit:
+.PP
+Correct:
+.IP
+.nf
+\f[C]
+\[aq]https://www.youtube.com/watch?v=FqZTN594JQw&list=PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4\[aq]
+\f[]
+.fi
+.PP
+Incorrect:
+.IP
+.nf
+\f[C]
+\[aq]https://www.youtube.com/watch?v=FqZTN594JQw&list=\[aq]
+\[aq]PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4\[aq]
+\f[]
+.fi

 .SS Use safe conversion functions
 .PP
 .SS Use safe conversion functions
 .PP

-Wrap all extracted numeric data into safe functions from \f[C]utils\f[]:
+Wrap all extracted numeric data into safe functions from
+\f[C]youtube_dl/utils.py\f[] (https://github.com/rg3/youtube-dl/blob/master/youtube_dl/utils.py):

 \f[C]int_or_none\f[], \f[C]float_or_none\f[].
 Use them for string to number conversions as well.
 \f[C]int_or_none\f[], \f[C]float_or_none\f[].
 Use them for string to number conversions as well.

+.PP
+Use \f[C]url_or_none\f[] for safe URL processing.
+.PP
+Use \f[C]try_get\f[] for safe metadata extraction from parsed JSON.
+.PP
+Explore
+\f[C]youtube_dl/utils.py\f[] (https://github.com/rg3/youtube-dl/blob/master/youtube_dl/utils.py)
+for more useful convenience functions.
+.SS More examples
+.SS Safely extract optional description from parsed JSON
+.IP
+.nf
+\f[C]
+description\ =\ try_get(response,\ lambda\ x:\ x[\[aq]result\[aq]][\[aq]video\[aq]][0][\[aq]summary\[aq]],\ compat_str)
+\f[]
+.fi
+.SS Safely extract more optional metadata
+.IP
+.nf
+\f[C]
+video\ =\ try_get(response,\ lambda\ x:\ x[\[aq]result\[aq]][\[aq]video\[aq]][0],\ dict)\ or\ {}
+description\ =\ video.get(\[aq]summary\[aq])
+duration\ =\ float_or_none(video.get(\[aq]durationMs\[aq]),\ scale=1000)
+view_count\ =\ int_or_none(video.get(\[aq]views\[aq]))
+\f[]
+.fi

 .SH EMBEDDING YOUTUBE\-DL
 .PP
 youtube\-dl makes the best effort to be a good command\-line program,
 .SH EMBEDDING YOUTUBE\-DL
 .PP
 youtube\-dl makes the best effort to be a good command\-line program,


@@ -2401,7 +2505,7 @@ For discussions, join us in the IRC channel
 (webchat (https://webchat.freenode.net/?randomnick=1&channels=youtube-dl)).
 .PP
 \f[B]Please include the full output of youtube\-dl when run with
 (webchat (https://webchat.freenode.net/?randomnick=1&channels=youtube-dl)).
 .PP
 \f[B]Please include the full output of youtube\-dl when run with

-\f[C]\-v\f[]\f[], i.e.
+\f[BC]\-v\f[B]\f[], i.e.

 \f[B]add\f[] \f[C]\-v\f[] flag to \f[B]your command line\f[], copy the
 \f[B]whole\f[] output and post it in the issue body wrapped in ``` for
 better formatting.
 \f[B]add\f[] \f[C]\-v\f[] flag to \f[B]your command line\f[], copy the
 \f[B]whole\f[] output and post it in the issue body wrapped in ``` for
 better formatting.