thumbnail: Full URL to a video thumbnail image.
description: Full video description.
uploader: Full name of the video uploader.
+ license: License name the video is licensed under.
creator: The main artist who created the video.
release_date: The date (YYYYMMDD) when the video was released.
timestamp: UNIX timestamp of the moment the video became available.
upload_date: Video upload date (YYYYMMDD).
If not explicitly set, calculated from timestamp.
uploader_id: Nickname or id of the video uploader.
+ uploader_url: Full URL to a personal webpage of the video uploader.
location: Physical location where the video was filmed.
subtitles: The available subtitles as a dictionary in the format
{language: subformats}. "subformats" is a list sorted from