- `chapter`: Name or title of the chapter the video belongs to.
- `chapter_number`: Number of the chapter the video belongs to, as an integer.
- `chapter_id`: Id of the chapter the video belongs to, as a unicode string.
- `chapter`: Name or title of the chapter the video belongs to.
- `chapter_number`: Number of the chapter the video belongs to, as an integer.
- `chapter_id`: Id of the chapter the video belongs to, as a unicode string.