[docs] Document which fields --add-metadata adds to the file

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pukkandan 2021-08-03 01:33:51 +05:30
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@ -1328,8 +1328,30 @@ # MODIFYING METADATA
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`. 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`.
This option also has a few special uses: This option also has a few special uses:
* You can use this to change 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
* You can download an additional URL based on the metadata of the currently downloaded video. To do this, set the field `additional_urls` to the URL that you want to download. Eg: `--parse-metadata "description:(?P<additional_urls>https?://www\.vimeo\.com/\d+)` will download the first vimeo video found in the description * You can download an additional URL based on the metadata of the currently downloaded video. To do this, set the field `additional_urls` to the URL that you want to download. Eg: `--parse-metadata "description:(?P<additional_urls>https?://www\.vimeo\.com/\d+)` will download the first vimeo video found in the description
* You can use this to change 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. For example, you can use this to set a different "description" and "synopsis"
For reference, these are the fields yt-dlp adds by default to the file metadata:
Metadata fields|From
:---|:---
`title`|`track` or `title`
`date`|`upload_date`
`description`, `synopsis`|`description`
`purl`, `comment`|`webpage_url`
`track`|`track_number`
`artist`|`artist`, `creator`, `uploader` or `uploader_id`
`genre`|`genre`
`album`|`album`
`album_artist`|`album_artist`
`disc`|`disc_number`
`show`|`series`
`season_number`|`season_number`
`episode_id`|`episode` or `episode_id`
`episode_sort`|`episode_number`
`language` of each stream|From the format's `language`
**Note**: The file format may not support some of these fields
## Modifying metadata examples ## Modifying metadata examples