Pre-roll and Post-roll in Sequencer

Development Rendering
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1

Hi,

Anyone knows what actually are "pre-roll” and "post-roll“ in sequencer mean and how are they used in which circumstances?

2

I am also curious about this issue today.

This is the relevant document description I found on the official website.
It roughly means that it is used for early loading or expansion of animation tracks and media tracks.
虚幻引擎过场动画轨道 | 虚幻引擎5.3文档 (unrealengine.com)
使用媒体轨道 | 虚幻引擎5.3文档 (unrealengine.com)

Check this button “Pre/Post Roll” in the editor interface to control the UI display
image

hope it will be helpful to you.