How to slow down a fast scroll in a screen recording without smearing the text
Tell Vizard Agent which scroll is too fast and how long it should last. It checks how the scroll was recorded first. When the page jumps in big steps at a low frame rate, slowing it down strobes and smoothing smears the text, so it stitches the frames into one tall page and renders a new scroll at a steady speed.
What do you type into Vizard Agent?
Give the timestamp, say what viewers need to do there, such as scan the content, and give the new length. The length matters more than the word slower. Doubling a three-second scroll to six seconds tells Vizard Agent exactly how fast the page should travel.
At 1:55, where we show the report summary, slow that clip down to about half speed. It zooms by too fast and makes me dizzy. We want viewers to be able to scan the content, so make it six seconds instead of three.
What does Vizard Agent actually do?
It measures the scroll before choosing a method. A recording made at a low frame rate holds big jumps between frames, and anything that invents in-between frames has to guess what the text looked like between two positions. In the session behind this article it:
- Read the frame timestamps of the source and found the scroll was captured at about 12 frames a second inside a 30-frame edit, so plain half speed would strobe.
- Tried motion smoothing at half speed and measured it frame by frame: the page moved unevenly, sometimes backwards, and the text ghosted, so it was rejected.
- Matched consecutive frames and found the page moved exactly 117 pixels each time, 3,627 pixels over 32 frames.
- Stitched the frames into one page 4,707 pixels tall, using the part of each frame the cursor never touched, and checked windows of it against the real frames.
- Rendered a new six-second scroll across that page at a steady 22 pixels a frame, less than half the original speed, and checked a crop for sharp text.
When does this not work well?
When something on the page changes while it scrolls. Stitching assumes a still document moving past the window, like a report or a long web page. If a video plays, a menu opens or the cursor matters during the scroll, the stitched page cannot show it, and a hold or a cut works better.
Common questions
Why not just slow the clip down? At a low frame rate it strobes. Vizard Agent measures this first.
Does the text stay sharp? Yes. Vizard Agent moves a real stitched page instead of guessing frames.
Can I choose the length? Yes. Vizard Agent sets the speed from the length you ask for.