Shorten video with speed control effect strip already applied I've got a video in the Video Editor workspace with a Transform effect strip to scale the video and a Speed Control effect strip to double the speed. I added these effects, then found the frames where I wanted the video to start and stop. I've positioned the video so that the start point is at Frame Start for the scene, and it starts there fine. But when I want to take frames off the end, the speed changes. If I turn off &quot;Stretch to input strip length&quot; in the Speed Control and then try to shorten the video, it randomly freezes at some seemingly arbitrary point about halfway through and doesn't finish. How can I avoid these issues?
The UI of the Speed Strips are super unintuitive. I've tried to address the subject matter here without any success: https://developer.blender.org/D6110
There are four ways to change the speed of the strip, using the speed strip options. I hope listing them here will help you and others out:
&quot;Stretch to input strip length&quot;

The &quot;Use as Speed&quot; does exactly the same as the Multiply Speed:

If &quot;Scale to Length&quot; is selected the strip duration goes from 0%(first frame) to 100%(last frame) and those values needs to be animated:

When &quot;Scale to Length&quot; is unselected, and behaves like the previous setting, but in frame numbers.