Represents a source for a Shopify hosted video.
Types of sources include the original video, lower resolution versions of the original video,
and an m3u8 playlist file.
Only [videos](https://shopify.dev/api/admin-graphql/latest/objects/video) with a status field
of [READY](https://shopify.dev/api/admin-graphql/latest/enums/MediaStatus#value-ready) have sources.