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I have a video clip of a number dial (think old style alarm clock) that I want to use to display scores on a scoreboard. The video clip shows the numbers flipping each second but I was planning on using the Retime Speed or Retime Frame curves to pause the clip, then restart it for 1 second each time a score is made. It works great!

However, I cannot extend the duration of the video clip longer than the original source file (40s). As you can see in the image below, then trying to grab the right side of the clip and move right, it glows red (instead of green, which is does when moving the end of the clip forward or backwards less than 40 seconds. Likewise, when I right-click and try to change the duration manually to 35 minutes, it doesn't work. No error, just doesn't extend.

One other thing - you can see in the test image below that I jump to only one of the middle frames by the end of the clip - there are many more frames left to be usable. I had thought that adding in this pause would allow me to extend the clip but it hasn't.

Both the "Flip Clock" video and the project are 29.97fps

enter image description here

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If you use Retime Speed instead of Retime Frame, the clip can be extended. Retime Frame gives you the ability to arbitrarily access the source media according to the curve, but there's no concept of time stretching--the clip in the timeline has a fixed amount of time and the only variable is what frame to play at a given time. Retime Speed controls the concept of time. If you slow the speed down to 50%, you get 100% more time for your clip to play. When you slow the speed down to 0%, you get infinite time to play your clip (and interesting edge conditions--so keep it to something like 1%).

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