live stream that goes on instead of a fixed-length video.
was_live: True, False, or None (=unknown). Whether this video was
originally a live stream.
- live_status: 'is_live', 'is_upcoming', 'was_live', 'not_live' or None (=unknown)
+ live_status: None (=unknown), 'is_live', 'is_upcoming', 'was_live', 'not_live'
+ or 'post_live' (was live, but VOD is not yet processed)
If absent, automatically set from is_live, was_live
start_time: Time in seconds where the reproduction should start, as
specified in the URL.