upload_date: Video upload date (YYYYMMDD).
If not explicitly set, calculated from timestamp.
uploader_id: Nickname or id of the video uploader.
- location: Physical location of the video.
+ location: Physical location where the video was filmed.
subtitles: The subtitle file contents as a dictionary in the format
{language: subtitles}.
duration: Length of the video in seconds, as an integer.