startOffsetTimelineReference
Sets the Timeline reference point to calculate the startOffset from.
Limitations
Setting the start offset relative to TimelineReferencePoint.End when connected to a cast-compatible device is not supported.
Considerations
We recommend using SourceLiveConfig.targetLatency instead of TimelineReferencePoint.End with startOffset for live streams.
Default for VOD: TimelineReferencePoint.Start Default for live: TimelineReferencePoint.End