[documentation] Improve --parse-metadata documentation

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pukkandan 2021-04-03 14:03:25 +05:30
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@ -46,6 +46,8 @@ This is a [youtube-dl](https://github.com/ytdl-org/youtube-dl) fork based on the
* [Filtering Formats](#filtering-formats)
* [Sorting Formats](#sorting-formats)
* [Format Selection examples](#format-selection-examples)
* [MODIFYING METADATA](#modifying-metadata)
* [Modifying metadata examples](#modifying-metadata-examples)
* [PLUGINS](#plugins)
* [DEPRECATED OPTIONS](#deprecated-options)
* [MORE](#more)
@ -669,26 +671,9 @@ Then simply run `make`. You can also run `make yt-dlp` instead to compile only t
--no-embed-thumbnail Do not embed thumbnail (default)
--add-metadata Write metadata to the video file
--no-add-metadata Do not write metadata (default)
--parse-metadata FIELD:FORMAT Parse additional metadata like title/artist
from other fields. Give a template or field
name to extract data from and the format to
interpret it as, separated by a ":". Either
regular expression with named capture
groups or a similar syntax to the output
template can be used for the FORMAT.
Similarly, the syntax for output template
can be used for FIELD to parse the data
from multiple fields. The parsed parameters
replace any existing values and can be used
in output templates. This option can be
used multiple times. Example: --parse-
metadata "title:%(artist)s - %(title)s"
matches a title like "Coldplay - Paradise".
Example: --parse-metadata "%(series)s
%(episode_number)s:%(title)s" sets the
title using series and episode number.
Example (regex): --parse-metadata
"description:Artist - (?P<artist>.+?)"
--parse-metadata FROM:TO Parse additional metadata like title/artist
from other fields; see "MODIFYING METADATA"
for details
--xattrs Write metadata to the video file's xattrs
(using dublin core and xdg standards)
--fixup POLICY Automatically correct known faults of the
@ -1205,6 +1190,33 @@ $ yt-dlp -S 'res:720,fps'
$ yt-dlp -S '+res:480,codec,br'
```
# MODIFYING METADATA
The metadata obtained the the extractors can be modified by using `--parse-metadata FROM:TO`. The general syntax is to give the name of a field or a template (with similar syntax to [output template](#output-template)) to extract data from, and the format to interpret it as, separated by a ":". Either a [python regular expression](https://docs.python.org/3/library/re.html#regular-expression-syntax) with named capture groups or a similar syntax to the [output template](#output-template) (only `%(field)s` formatting is supported) can be used for `TO`. The option can be used multiple times to parse and modify various fields.
Note that any field created by this can be used in the [output template](#output-template) and will also affect the media file's metadata added when using `--add-metadata`.
You can also use this to change only the metadata that is embedded in the media file. To do this, set the value of the corresponding field with a `meta_` prefix. For example, any value you set to `meta_description` field will be added to the `description` field in the file. You can use this to set a different "description" and "synopsis", for example.
## Modifying metadata examples
Note that on Windows you may need to use double quotes instead of single.
```bash
# Interpret the title as "Artist - Title"
$ yt-dlp --parse-metadata "title:%(artist)s - %(title)s"
# Regex example
$ yt-dlp --parse-metadata "description:Artist - (?P<artist>.+)"
# Set title as "Series name S01E05"
$ yt-dlp --parse-metadata "%(series)s S%(season_number)02dE%(episode_number)02d:%(title)s"
# Set "comment" field in video metadata using description instead of webpage_url
$ yt-dlp --parse-metadata "description:(?s)(?P<meta_comment>.+)" --add-metadata
```
# PLUGINS
Plugins are loaded from `<root-dir>/ytdlp_plugins/<type>/__init__.py`. Currently only `extractor` plugins are supported. Support for `downloader` and `postprocessor` plugins may be added in the future. See [ytdlp_plugins](ytdlp_plugins) for example.
@ -1221,7 +1233,7 @@ These are all the deprecated options and the current alternative to achieve the
-t, --title -o "%(title)s-%(id)s.%(ext)s"
-l, --literal -o accepts literal names
--autonumber-size NUMBER Use string formatting. Eg: %(autonumber)03d
--metadata-from-title FORMAT --parse-metadata "title:FORMAT"
--metadata-from-title FORMAT --parse-metadata "%(title)s:FORMAT"
--prefer-avconv avconv is no longer officially supported (Alias: --no-prefer-ffmpeg)
--prefer-ffmpeg Default (Alias: --no-prefer-avconv)
--avconv-location avconv is no longer officially supported

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@ -862,7 +862,7 @@ def parseOpts(overrideArguments=None):
callback_kwargs={
'allowed_keys': '|'.join(OUTTMPL_TYPES.keys()),
'default_key': 'default', 'process': lambda x: x.strip()},
help='Output filename template, see "OUTPUT TEMPLATE" for details')
help='Output filename template; see "OUTPUT TEMPLATE" for details')
filesystem.add_option(
'--output-na-placeholder',
dest='outtmpl_na_placeholder', metavar='TEXT', default='NA',
@ -1144,22 +1144,10 @@ def parseOpts(overrideArguments=None):
help=optparse.SUPPRESS_HELP)
postproc.add_option(
'--parse-metadata',
metavar='FIELD:FORMAT', dest='metafromfield', action='append',
metavar='FROM:TO', dest='metafromfield', action='append',
help=(
'Parse additional metadata like title/artist from other fields. '
'Give a template or field name to extract data from and the '
'format to interpret it as, separated by a ":". '
'Either regular expression with named capture groups or a '
'similar syntax to the output template can be used for the FORMAT. '
'Similarly, the syntax for output template can be used for FIELD '
'to parse the data from multiple fields. '
'The parsed parameters replace any existing values and can be used in output templates. '
'This option can be used multiple times. '
'Example: --parse-metadata "title:%(artist)s - %(title)s" matches a title like '
'"Coldplay - Paradise". '
'Example: --parse-metadata "%(series)s %(episode_number)s:%(title)s" '
'sets the title using series and episode number. '
'Example (regex): --parse-metadata "description:Artist - (?P<artist>.+?)"'))
'Parse additional metadata like title/artist from other fields; '
'see "MODIFYING METADATA" for details'))
postproc.add_option(
'--xattrs',
action='store_true', dest='xattrs', default=False,