But the rounding error introduced while someone adjusted the Speed ratio several times trying to find just the right amount would probably destroy all precision the author had in the original keyframes. It’s theoretically possible that Shotcut could be modified to scale manual keyframe timestamps by the Speed ratio. The options are start/middle/end dynamic, or manual timestamp static. The second level is how the timestamps of filter keyframes get mapped to the underlying clip. The first level is “how long is a clip” (finite or infinite) which determines whether a Speed ratio can be applied. So the answer to your question happens on two levels. However, the same trick will not work with manually keyframed text movement, because manual keyframes are defined for specific frame timestamps which do not get translated or adjusted by the Speed ratio. This workaround is unique to presets that define keyframes on “start” and “end” points, meaning they stretch to fit the length of the underlying clip. Note the scrolling text also slowed down to half speed.Go to the transparent video clip Properties panel and change the speed to 0.5x like a normal video (because it is an actual video file, albeit transparent).Add a text filter with the Scroll Up preset.Start a new project and bring in the transparent video clip from above.Start a new project, add a transparent clip that’s several minutes long to handle a worst case scenario, and export it as QuickTime Animation to preserve the alpha channel.In the example of slowing down scrolling text using the Speed property: The end of a generator clip doesn’t represent a fixed length it simply says internally that frames from the generator will no longer be routed to the compositing pipeline. Because a generator source can produce infinite frames for infinite length, there is no “length” property that can change to simulate a speed ramp. But frame duplication is not desirable with a programmatic source, because it has the code to generate in-between frames mathematically without duplication, which makes for smoother slow-mo video. If a normal video clip is slowed down, its frames are duplicated (if needed) to fill the new length. The reasoning gets a little bit circular: Speeding up or slowing down programmatic video would need to be done by altering the parameters sent to the generator (as is the case with File > Open Other > Plasma). A color or transparent clip is a generator source, meaning an infinite source of video that’s generated programmatically rather than by seeking into a video file of finite length.
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