Your clip ends, the story doesn’t. Upload the footage, write what happens next, and Yovid continues the shot on Seedance 2.5 with the same characters, set and light, plus sound to match.
Re-rolling a whole clip to win two more seconds risks losing the take you liked. An extension keeps the footage you have and adds new footage after it: Seedance 2.5 reads your clip, carries on from its final moment and hands back a fresh segment to drop in right after the original. Use it when a shot needs a longer hold for the edit, when a reaction is missing, or to grow a scene a few seconds at a time.
Replace a product, rebuild the backdrop or give the footage a new look while the camera move and pacing hold.
Video to video AITurn the picture into the opening frame of a moving shot; Seedance 2.5 can run it as long as 30 seconds.
Image to video AIGive the model an opening and a closing keyframe and let it build the move between them.
First and last frame to videoIn ByteDance Seed’s Seedance 2.5 example the source ends with the mother at the kitchen door. The extension opens on that same moment and plays on as the girl turns toward her, while the clothes, the step stool and the tomatoes on the board stay exactly where they were.
Seedance 2.5Your wording picks the mode. Start with “Extend” and Seedance 2.5 adds time; write a change such as “replace” or “change the background” and it edits the footage you uploaded instead, keeping the camera move. Here a park walk becomes a French vineyard with wine glasses in hand.
Seedance 2.5Calculated with the same formula the generator charges with, so these figures follow any rate change.
| Resolution | Credits per billed second | 5 s clip + 5 s new | 10 s clip + 10 s new | 8 s clip + 30 s new | Available on |
|---|---|---|---|---|---|
| 480p | 2.12 | 21 | 42 | 81 | Lite, Pro, Premium and credit packs |
| 720p | 4.58 | 46 | 92 | 174 | Lite, Pro, Premium and credit packs |
| 1080p | 10.21 | 102 | 204 | 388 | Pro, Premium and credit packs |
An extension bills the seconds you upload plus the seconds you add, at Seedance 2.5’s reference-clip rate and before plan discounts. Trimming the source to the part the continuation needs saves credits. The extend mode is not on free credits; failed generations are not charged.
Use cases
Add the extra beat a cut needs, so the shot breathes before the next one instead of ending mid-move.
Extend, review, extend again: each segment continues the last, so a scene can grow well past one generation.
Let the scene continue into the reply, the look back or the punchline that the original take cut off.
Write the next line in quotes and name the speaker; the new segment carries the voices and room tone forward.
Step 1
Pick Seedance 2.5 and drop in a single MP4 or MOV (2–30 s, 200 MB max) that you have the rights to.
Step 2
Write “Extend @Video 1” and describe what happens next. The word extend sends the job to extend mode; no menu to switch.
Step 3
Set how many new seconds you want (4–30) and the resolution, check the credits, generate, then drop the result after your original.
One or two sentences on the final frame (framing, pose, who is where) help the model hold it before the new action starts.
Give a short extension one clear event. For longer ones, split the action into beats such as “0–4 s … 4–8 s …”.
Source seconds are billed too, so upload only the last stretch of a long clip when the earlier part adds nothing.
Need more than one run’s worth? Use the new segment as the next source and extend again, then join the pieces in order.
Name the footsteps, room tone or line of dialogue you want; switch audio off when you will score the clip yourself.
Real people’s faces and protected characters may be refused by the model provider; refused runs are not charged.
Related tools
An extension is one step. Edit, restyle, or start the next shot from a still, all with the same account and credits.
Prompt guideSeedance 2.5 prompt guideTimed beats and the exact wording for extend and edit runs.Read guide
Model comparisonSeedance 2.5 vs Seedance 2.0What the edit and extend modes add, and when 2.0 still wins.Read guide
Model comparisonAI video models comparedFrames, references, length and resolution for 14 models.Read guide