You can now run a pre-recorded video during YouTube live

California [United States]: In addition to announcing new ways of monetization, YouTube also introduced a new feature of publishing called Premieres.

Premiers allows you to run a pre-recorded clip in perfect sync during a live session, The Verge reported.The pre-recorded clip can be scheduled similar to how the live stream is scheduled to build hype. Viewers will be able to join through real-time chat.