Sidecar timestamp where playback ends, in seconds. When not set, sidecar duration is used.
First sidecar timestamp to be played, in seconds.
OptionalplayerMain media timestamp when sidecar starts playing, in seconds. When not set, sidecar starts playing at main media start (0).
Time window of a container track played as sidecar.
Sidecar is played from cutStartTime to cutEndTime, starting when main media reaches playerStartTime. For example, with
cutStartTime: 3, cutEndTime: 10, playerStartTime: 20main media time 21 maps to sidecar time 4.