First to Last Frame AI for Smooth Video
First to Last Frame AI creates smooth video by locking start and end images. The guide covers Seedance 2.0, Veo 3.1 and Kling 3.0 settings plus credit costs and export steps.
TL;DR
First to Last Frame AI accepts two images and generates every frame between them. Seedance 2.0, Veo 3.1 and Kling 3.0 handle motion at 24 fps for clips of 4-12 seconds at 18-22 credits each. Users control angle change and motion strength directly in the interface.
What First to Last Frame AI does
First to Last Frame AI takes an opening image and a closing image. It fills every frame between them while keeping subject identity and motion path intact. The method differs from standard text-to-video because it enforces exact start and end points rather than letting the model invent the full sequence.
How the process runs under the hood
The system encodes both frames with a shared latent space. Seedance 2.0 then predicts intermediate motion vectors at 24 frames per second for clips up to 8 seconds. Veo 3.1 refines depth and lighting consistency across those frames using its 3.1 flash attention layers. Kling 3.0 adds temporal noise scheduling that reduces flicker when the start and end frames differ in camera angle by more than 30 degrees.
Users select the model at generation time. Wan 2.7 offers faster inference at 12 frames per second when budget credits are limited. Nano Banana Pro supplies higher detail for character faces when the workflow requires close-ups.
Concrete inputs and outputs
A typical run needs:
- Start frame: 1024x576 PNG or JPG
- End frame: same resolution
- Duration: 4-12 seconds
- Motion strength: 0.4-0.9 slider
- Credit cost: 18 credits for Seedance 2.0 at 8 seconds
Output is an MP4 file at 1080p with embedded alpha when the background was removed first via the AI Image Tools page.
Real workflow examples
A product video starts with a clean render on a white backdrop. The last frame shows the same product on a wooden table. The model interpolates a 6-second pan and slight rotation. The clip drops straight into a Shorts Generator timeline without extra keyframing.
Manga panels convert to motion when the first panel and last panel are supplied to the Manga Creator. Seedance 2.0 keeps line weights steady across 48 frames.
Voice-over tracks generated with Text to Speech sync automatically when the same 8-second duration is chosen for both audio and video.
Model comparison
| Model | Max seconds | FPS | Credit cost | Best for |
|---|---|---|---|---|
| Seedance 2.0 | 8 | 24 | 18 | Character motion |
| Veo 3.1 | 10 | 30 | 22 | Cinematic camera moves |
| Kling 3.0 | 12 | 24 | 20 | Large angle changes |
| Wan 2.7 | 6 | 12 | 9 | Quick tests |
Where to start
Open the dedicated tool at First to Last Frame. Upload two frames, pick Seedance 2.0, set duration to 6 seconds, and run the first test. Adjust motion strength on the second pass if the path feels too linear.
FAQ
What resolution works best for start and end frames? 1024x576 or 1280x720 gives the cleanest results with current models. Higher resolutions increase credit cost without visible quality gain below 8-second clips.
Can I change the camera angle between the two frames? Yes. Kling 3.0 and Veo 3.1 both accept up to 45-degree differences before artifacts appear. Test a 3-second clip first to confirm the path stays stable.
How does credit usage compare to Image to Video? First to Last Frame costs 18 credits for an 8-second Seedance 2.0 clip. Image to Video at the same length uses 15 credits but lacks the fixed end-frame constraint.
Does the tool support lip sync on the generated clip? Export the video then route it through the Lip Sync Video page. The two-step process keeps the frame-to-frame motion while adding mouth movement from a separate audio file.
What file formats are accepted for input frames? PNG and JPG are supported. 8-bit and 16-bit color depth both work. Avoid images with heavy compression artifacts above 90 percent JPEG quality.
Frequently Asked Questions
What resolution works best for start and end frames?▾
1024x576 or 1280x720 gives the cleanest results with current models. Higher resolutions increase credit cost without visible quality gain below 8-second clips.
Can I change the camera angle between the two frames?▾
Yes. Kling 3.0 and Veo 3.1 both accept up to 45-degree differences before artifacts appear. Test a 3-second clip first to confirm the path stays stable.
How does credit usage compare to Image to Video?▾
First to Last Frame costs 18 credits for an 8-second Seedance 2.0 clip. Image to Video at the same length uses 15 credits but lacks the fixed end-frame constraint.
Does the tool support lip sync on the generated clip?▾
Export the video then route it through the Lip Sync Video page. The two-step process keeps the frame-to-frame motion while adding mouth movement from a separate audio file.
What file formats are accepted for input frames?▾
PNG and JPG are supported. 8-bit and 16-bit color depth both work. Avoid images with heavy compression artifacts above 90 percent JPEG quality.
