In Seedance 2.5 video editing, "Insert timecode" now gives you a start and an end slider,
and what lands in your prompt is a span like 00:05-00:08 rather than a single moment.
Why a span works better
Video editing is a full re-render: the model regenerates the clip, changing what you asked for and holding the rest. It needs to know where the boundaries are. Give it a moment and it has to guess; give it a start and an end and the change lands inside the window you drew.
The official prompting examples are all continuous spans too, so the panel now just gives you spans directly.
The panel tells you which stretches you left out
Say you wrote 00:05-00:08 to swap a character, but the clip runs 18 seconds — the other 13 seconds are unspecified.
The panel lists them:
00:00-00:05, 00:08-00:18 not described — the model will improvise
Next to it there's Fill gaps: one click turns them into "keep the original footage unchanged".
You don't have to click it. Letting the model improvise in the blank stretches is a perfectly normal way to work, so we don't decide that for you. It stays a line of text and a button, and nothing is added to your prompt when you send.
Two small notes
- The sliders move in whole seconds. The platform wants whole seconds, and previously you could stop on a half second, so what you saw and what you sent could differ.
- The video editing dialog from the node toolbar still inserts single moments — that path is for stepping through frames and marking a spot, where "this frame" is exactly what you mean. Both kinds of chip can live in the same prompt.