You can now play YouTube videos and even include an time-offset using AutoFX commands. You need Director 9.3 or later. New is the time offset. The 40 below says to start the playback 40 seconds after the beginning.
Examples:
*autofx
1,r=STAGE%PlayYouTube%GkYcGExumKs%40$
2,r=s%PlaySound%crowd
(a sound file called crowd needs to already be loaded into the Director)
3,r=STAGE%PlayMedia%https://vimeo,com/123456
This next Command STOPS the media.
2,r=STAGE%StopMedia$
*sequences nc
MediaDelay,0.0
MediaDelay,20.0