08 = Newsletter Individual #9

Issue #9

Jul 2, 2026

8 min read

How to Use AI B-Roll to Fill the Gaps in Footage You Already Shot.

My tested workflow for using Runway Aleph 2.0 to relight, reframe, and re-weather footage you already have, finishing the video without going back on location.

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What you’ll get in 3 minutes

TLDR

In this issue

8 min read

Big Idea

Audit

Edit

Propagate

Most production gaps are not dramatic. They are quiet. A cutaway shot that was never wide enough. An establishing shot filmed at the wrong time of day. A B-roll sequence that looked fine on location and flat in the edit. These are the gaps that slow production down, not because they are hard to fix, but because the traditional fix is to go back on location. Runway Aleph 2.0, launched May 21, 2026, takes a different position on this problem entirely. It does not generate new footage. It rewrites footage you already have. Change the lighting. Change the weather. Change the camera angle. Change the background. The subject stays. The motion stays. Only what you asked to change gets rewritten.

“Aleph 2.0 is not a generation tool. It is a rewrite tool. The footage you already have becomes the starting point for every version you actually needed.”

I spent three weeks running real production footage through Aleph 2.0 after its launch. The use cases that work consistently are precise and repetitive: changing time of day in an establishing shot, relighting a talking-head clip where the original lighting was wrong, swapping a background that no longer matches the edit direction, and filling a B-roll gap where you have a similar shot but not the exact one you needed. The use cases that do not work: fixing handheld camera shake, inventing content the original camera never captured, and making large-scale composition changes to a clip where the subject fills the frame. Knowing the boundary saves credits and project time.

The 4-Step Workflow

Step 1

The 4-Step Workflow

Audit Your Footage Gaps Before Opening Aleph

Go through your edit timeline and write down every B-roll gap or problem clip. For each one, answer three questions: Do I have existing footage of the same subject or location that is close to what I need? Is the problem in the clip a lighting, background, or weather issue rather than a composition or motion issue? Would a viewer notice if this clip was a slightly relit or re-weathered version of a different shot? If the answer to all three is yes, Aleph 2.0 can likely fix it. If the problem is composition, shake, or content the camera never captured, you need Gen-4.5 instead.

Vague gap → Specific fix decision

Step 2

Edit One Keyframe First in Edit Studio

Preview the change as a still image before spending video generation credits.

Aleph 2.0 launches alongside Edit Studio, which lets you edit a single representative frame of the clip to show the model what the intended change looks like before generating the full video result. Open the clip in Edit Studio, select the frame that best represents the change you want, make the adjustment visually, add a text instruction describing the change, and generate the image preview. This step costs a fraction of a full video generation credit. Confirm the look is right before committing to the clip. This single habit eliminates most wasted Aleph generations.

Blind generation → Image preview first

Step 3

Write the Instruction to Describe What Changes and What Stays

Precision in the instruction is what separates a clean edit from a broken clip.

Aleph 2.0 responds to instructions that specify the change explicitly and protect the elements that should not change. Write: what you want changed, how it should look after the change, and what must remain identical. For relighting: name the new light source, direction, and quality. For background replacement: describe the replacement environment and its relationship to the subject. For weather changes: specify the new weather condition and the time of day. Always add a line that protects the subject: “Subject appearance, motion, and position unchanged.” This instruction structure gives Aleph the clearest possible target.

Vague instruction → Precise change description

Step 4

Propagate the Edit Across Multiple Shots

Aleph 2.0 carries consistent edits across up to 10 cuts in the same clip.

For clips with multiple cuts or scene changes, Aleph 2.0 can apply the same edit across up to 10 shots in a single generation pass. If you change the product colourway in shot one of a product video, the change carries through shots three, five, and seven without rebuilding each individually. This is the feature that makes Aleph genuinely useful for multi-shot B-roll sequences and short documentary cuts where a lighting or background inconsistency runs through multiple clips. Enable multi-shot propagation in the Edit Studio interface before generating. Add keyframe anchors at the points where the edit needs to hold most precisely, up to five anchors per generation.

Shot-by-shot repair → Single-pass propagation

Tool of the Week

featured

Runway Aleph

In-context AI video editor that rewrites existing footage from text instructions

What changed my assessment of Aleph 2.0 was a single test: a talking-head interview clip filmed in flat afternoon light that needed to feel like early morning. One instruction, one keyframe anchor on the subject’s face, one image preview to confirm the direction. The generated clip held the subject’s appearance and motion accurately and rewrote the ambient light. No reshoot. The credit cost was roughly 150 credits for a 10-second clip, higher than a standard Gen-4.5 generation, but lower than a half-day reshoot by several orders of magnitude.

Try it yourself

Prompt Recipe

Copy & Use

You are directing an AI video edit in Runway Aleph 2.0 Edit Studio.

Context: I have an existing [DURATION: e.g. 8-second] clip of [DESCRIBE SUBJECT AND SCENE: e.g. a woman walking along a city street, medium shot, overcast afternoon light]. This clip has a problem: [DESCRIBE THE GAP: e.g. the lighting is flat and grey, the scene needs to feel like golden hour / the background is a generic street, needs to feel like a park entrance / the weather is overcast, needs to look like light rain].

Task: Rewrite the clip with the following change:

Change: [DESCRIBE EXACTLY WHAT CHANGES: e.g. Lighting — replace flat overcast with warm golden hour light, sun from screen right, long shadows behind subject, warm orange-yellow tone on skin and environment]

Protect: Subject appearance, clothing, motion, and position in frame must remain identical to the original footage. Camera movement unchanged. Any text or signage in the background may be altered if needed but should not become readable.

Keyframe anchor: [DESCRIBE WHERE TO ANCHOR: e.g. Place anchor at 00:03 on the subject’s face to preserve identity through the lighting transition]

Format: 1080p output. Match original clip frame rate. Propagate change across [NUMBER] shots if multiple cuts are present.

Constraints: Do not alter subject motion or camera movement. Do not add characters not present in the original. Do not change the composition beyond the specified edit. Preserve film grain and original lens characteristics where possible.

Pro Tips:

Mini Case Study

Real Results

Wrong time of day on the establishing shot. No matching footage. Client requested a warmer, golden-hour feel after delivery.

After: Runway Aleph 2.0 Edit

Existing overcast footage relit to golden hour using one Aleph instruction and a single keyframe anchor on the subject. Client approved on first pass.

Download

FREE

B-Roll Gap Filling Workflow Guide

Step-by-step guide to auditing footage gaps and fixing them with Runway Aleph 2.0

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Vani Aggarwal

Filmmaker & Head of Content Strategy exploring the edge where Al meets
story.

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