Add `playlist_channel` and `playlist_channel_id` fields (#10266)

Authored by: bashonly

README.md

@@ -1288,6 +1288,8 @@ The available fields are:
  - `playlist_autonumber` (numeric): Position of the video in the playlist download queue padded with leading zeros according to the total length of the playlist
  - `playlist_uploader` (string): Full name of the playlist uploader
  - `playlist_uploader_id` (string): Nickname or id of the playlist uploader
+ - `playlist_channel` (string): Display name of the channel that uploaded the playlist
+ - `playlist_channel_id` (string): Identifier of the channel that uploaded the playlist
  - `webpage_url` (string): A URL to the video webpage which if given to yt-dlp should allow to get the same result again
  - `webpage_url_basename` (string): The basename of the webpage URL
  - `webpage_url_domain` (string): The domain of the webpage URL

yt_dlp/YoutubeDL.py

@@ -1926,6 +1926,8 @@ class YoutubeDL:
             'playlist_title': ie_result.get('title'),
             'playlist_uploader': ie_result.get('uploader'),
             'playlist_uploader_id': ie_result.get('uploader_id'),
+            'playlist_channel': ie_result.get('channel'),
+            'playlist_channel_id': ie_result.get('channel_id'),
             **kwargs,
         }
         if strict: