[wayne grauel] ”
What is going on with the difference in behavior of these two methods?”
With Ctrl/Drag you are defining how long it takes to play back a complete video event, so you are not changing the start and end points of the video.
Velocity envelopes change how fast the video plays within the duration of the event on the timeline. So if you speed up the video, it will use video frames that are past the defined out point you start with, or if there is no more video, will start again from the beginning.
Gary Kleiner
Learn Vegas and DVD Architect
http://www.VegasTrainingAndTools.com