First + End Frame workflow

TL;DR: Generate two images — one for the start, one for the end. Place both on the timeline, Shift+click to select them, choose an interpolation model in modelBridge, generate. If clips are adjacent, the result replaces both clips directly on the timeline. If not, it saves to your Project Bin.

What this workflow does

Standard video generation starts from a prompt or a single image. First + End Frame generation starts from two images — a start frame and an end frame — and generates the motion between them. You control exactly what the shot begins and ends with. The model fills in everything in between.

Use it for: transitions between two specific moments, interpolation between AI-generated images, or animating a scene where the start and end state both matter.

Step 1 — Generate or find your two images

Your start and end frames can come from anywhere:

Option A — Generate both in modelBridge:

Filter Browse by Text-to-image
Generate your start frame, preview, save using Save to Project Bin
Generate your end frame the same way
Drag both from the Project Bin to the timeline

Option B — Use existing images: Any still image in your Premiere Project Bin works — photos, exported frames, or AI-generated images from previous sessions.

Option C — Extract from video clips: Select a video clip on the timeline — modelBridge extracts the first frame automatically.

Step 2 — Place clips on the timeline

For the smoothest workflow, place your start and end frame clips on the same track, directly adjacent — no gap between them.

Adjacent means: the end of clip A is within a frame of the start of clip B, on the same track.

Why this matters: adjacent clips enable direct Import to Timeline after generation. Non-adjacent clips still work, but the result saves to Project Bin instead.

Step 3 — Select an interpolation model in modelBridge

Filter Browse by Image-to-video and look for interpolation or transition models. The dual-frame interface appears automatically when you have two clips selected and choose a compatible model.

There’s no separate “First + End Frame mode” to enable. modelBridge detects from the model’s schema whether it supports two image inputs and activates the dual-frame layout automatically.

Check the cost badge before committing.

Step 4 — Select your two clips

On the Premiere timeline, click your start frame clip first, then Shift+click your end frame clip.

The modelBridge clip info card updates to a dual-frame layout:

Left slot — “Start: [filename]”
Right slot — “End: [filename]”
Each slot shows a thumbnail with a “Valid Media” badge

Below the card, an adjacency info bar tells you your import options:

Green banner — “Clips are adjacent — import to timeline available.” After generation, Import to Timeline replaces both clips with the generated video as a single spanning clip.

Blue banner — “First + End frame generation available. Move clips next to each other to enable direct import to timeline. Otherwise, output saves to Project Bin for drag and drop.” Generation works, but result goes to Project Bin.

Step 5 — Configure and generate

Click ⓘ on any field for guidance. Typical fields:

Duration — length of the generated clip in seconds
Motion — how much movement occurs between frames
Prompt — optional text to guide the motion character

The self-learning validation system catches constraint errors per slot — you never pay for the same error twice.

Click Generate. The plugin extracts both frames and uploads them to fal.ai simultaneously.

Step 6 — Preview before import

The generated video appears in the modelBridge preview panel. Watch the full clip before touching the timeline.

Three options in the preview:

Import to Timeline — replaces both source clips if adjacent, or inserts at playhead if not
Save to Project Bin — saves without touching the timeline
Discard — deletes the generated file

Step 7 — Import

Adjacent clips: Click Import to Timeline. modelBridge removes both source clips and places the generated video spanning from the start of clip A to the end of clip B — auto-scaled to fit the frame.

Non-adjacent clips: The result is in your Project Bin. Drag it to the timeline at the right position.

In real projects

Two AI images, one smooth transition: Generate a dawn sky in modelBridge, save to bin. Generate a dusk sky, save to bin. Place both adjacent on the timeline. Run through an interpolation model. The result is a smooth time-lapse transition.

Animate a product shot: Start frame: product closed. End frame: product open. Run First + End Frame interpolation. The model generates the opening motion.

Bridge two scenes: Export a frame from the end of shot A and the start of shot B. Interpolate between them to generate a transition clip.

From text-to-image to motion: Generate multiple image variations of the same subject. Pick the best two as start and end frames. Interpolate between them.

Limitations

Limitation	What it means
Images only	Both clips must be images — video clips extract first frame
Adjacent required for direct import	Non-adjacent clips save to Project Bin instead
No Dual Mode support	First + End Frame does not work with Dual Mode
3+ clips selected	Selecting more than two clips triggers an error
Per-slot validation	Each frame validated independently against model constraints

Common failure modes — if generation fails or the motion between frames looks wrong.

From moodboard to locked shot — how to run a full generation pass before committing to a First + End Frame workflow.