Temporal media fragments
Allows embed code to reference a segment of the video stream or set a start time. Hover over the player to see start time listed as 10s, press play and notice it stops playback at 20 seconds.
Allows the association of timed text per the existing timedtext namespace used on commons. For more information about timed text usage in wikimedia projects see Timed Text on commons
Auto Source Selection based on embed size
Mouse over each video to see default selected stream in the player control bar.